Author: "(0000-0002-2769-4749) Schöbel, S." - Searchworks@Jio Institute Digital Library Search Results

Your search keyword '"(0000-0002-2769-4749) Schöbel, S."' showing total 61 results

Start Over Author "(0000-0002-2769-4749) Schöbel, S."

61 results on '"(0000-0002-2769-4749) Schöbel, S."'

1. Absolute energy-dependent scintillating screen calibration for real-time detection of laser-accelerated proton bunches

Author: (0009-0004-0743-4087) Schilz, J. D., (0000-0001-8205-8422) Bodenstein, E., (0000-0002-9859-2408) Brack, F.-E., (0000-0003-0707-0856) Horst, F., (0000-0002-4626-0049) Irman, A., (0000-0002-0275-9892) Kroll, F., (0000-0003-4128-5498) Pawelke, J., (0000-0003-0931-1350) Prencipe, I., (0000-0001-6200-6406) Rehwald, M., (0000-0003-4962-2153) Reimold, M., (0000-0002-2769-4749) Schöbel, S., (0000-0003-0390-7671) Schramm, U., (0000-0003-3926-409X) Zeil, K., (0000-0002-9556-0662) Metzkes-Ng, J., (0009-0004-0743-4087) Schilz, J. D., (0000-0001-8205-8422) Bodenstein, E., (0000-0002-9859-2408) Brack, F.-E., (0000-0003-0707-0856) Horst, F., (0000-0002-4626-0049) Irman, A., (0000-0002-0275-9892) Kroll, F., (0000-0003-4128-5498) Pawelke, J., (0000-0003-0931-1350) Prencipe, I., (0000-0001-6200-6406) Rehwald, M., (0000-0003-4962-2153) Reimold, M., (0000-0002-2769-4749) Schöbel, S., (0000-0003-0390-7671) Schramm, U., (0000-0003-3926-409X) Zeil, K., and (0000-0002-9556-0662) Metzkes-Ng, J.
Abstract: Laser-plasma accelerators (LPAs) can deliver pico- to nanosecond long proton bunches, with ≥∼100 nC of charge dispersed over a broad energy spectrum. Increasing the repetition rates of today’s LPAs is a necessity for their practical application. This, however, creates a need for real-time proton bunch diagnostics. Scintillating screens are one detector solution, commonly applied in the field of electron LPAs for spatially resolved particle and radiation detection, yet their establishment for LPA proton detection is only slowly taking off. This is also due to the lack of available calibrations. In this paper, we present an absolute proton number calibration for the scintillating screen type DRZ High (Mitsubishi Chemical Corporation, Düsseldorf, Germany), one of the most sensitive screens according to calibrations for relativistic electrons and x-rays. For proton irradiation of the DRZ High screen, we find an increase in light yield of >60% compared to reference calibration data for relativistic electrons. The presented absolute light yield calibration shows an uncertainty of the proton number of 10% and can seamlessly be applied at other LPA facilities. Moreover, we investigate the scintillating screen light yield dependence on proton energy, since many types of scintillators (e.g., plastic, liquid, inorganic) show a reduced light yield for increased local energy deposition densities, an effect termed ionization quenching. The ionization quenching can reduce the light yield for low-energy protons by up to ∼20%. This work provides all necessary data for absolute spectral measurements of LPA protons with DRZ High scintillating screens, e.g., when these are used as detectors in the commonly available Thomson parabola spectrometers.
Published: 2024

2. Data publication: Absolute energy-dependent scintillating screen calibration for real-time detection of laser-accelerated proton bunches

Author: (0009-0004-0743-4087) Schilz, J. D., (0000-0001-8205-8422) Bodenstein, E., (0000-0002-9859-2408) Brack, F.-E., (0000-0003-0707-0856) Horst, F., (0000-0002-4626-0049) Irman, A., (0000-0002-0275-9892) Kroll, F., (0000-0003-4128-5498) Pawelke, J., (0000-0003-0931-1350) Prencipe, I., (0000-0001-6200-6406) Rehwald, M., (0000-0003-4962-2153) Reimold, M., (0000-0002-2769-4749) Schöbel, S., (0000-0003-0390-7671) Schramm, U., (0000-0003-3926-409X) Zeil, K., (0000-0002-9556-0662) Metzkes-Ng, J., (0009-0004-0743-4087) Schilz, J. D., (0000-0001-8205-8422) Bodenstein, E., (0000-0002-9859-2408) Brack, F.-E., (0000-0003-0707-0856) Horst, F., (0000-0002-4626-0049) Irman, A., (0000-0002-0275-9892) Kroll, F., (0000-0003-4128-5498) Pawelke, J., (0000-0003-0931-1350) Prencipe, I., (0000-0001-6200-6406) Rehwald, M., (0000-0003-4962-2153) Reimold, M., (0000-0002-2769-4749) Schöbel, S., (0000-0003-0390-7671) Schramm, U., (0000-0003-3926-409X) Zeil, K., and (0000-0002-9556-0662) Metzkes-Ng, J.
Abstract: All necessary Data to recreate the published plots and images in the publication: "Absolute energy-dependent scintillating screen calibration for real-time detection of laser-accelerated proton bunches". Included are the raw scintillating screen images, the plotting data and Python Scripts used for calculations and plotting.
Published: 2024

3. Distortions in focusing laser pulses due to spatio-temporal couplings – An analytic description

Author: (0000-0001-8965-1149) Steiniger, K., Dietrich, F., (0000-0001-5602-3007) Albach, D., (0000-0002-8258-3881) Bussmann, M., (0000-0002-4626-0049) Irman, A., (0000-0001-7858-0007) Löser, M., (0000-0001-7990-9564) Pausch, R., (0000-0002-4738-6436) Püschel, T., Sauerbrey, R., (0000-0002-2769-4749) Schöbel, S., (0000-0003-0390-7671) Schramm, U., (0000-0002-4697-3014) Siebold, M., (0000-0003-3926-409X) Zeil, K., (0000-0002-3844-3697) Debus, A., (0000-0001-8965-1149) Steiniger, K., Dietrich, F., (0000-0001-5602-3007) Albach, D., (0000-0002-8258-3881) Bussmann, M., (0000-0002-4626-0049) Irman, A., (0000-0001-7858-0007) Löser, M., (0000-0001-7990-9564) Pausch, R., (0000-0002-4738-6436) Püschel, T., Sauerbrey, R., (0000-0002-2769-4749) Schöbel, S., (0000-0003-0390-7671) Schramm, U., (0000-0002-4697-3014) Siebold, M., (0000-0003-3926-409X) Zeil, K., and (0000-0002-3844-3697) Debus, A.
Abstract: In ultra-short laser pulses, small changes in dispersion properties before the final focusing mirror can lead to severe pulse distortions around the focus and therefore to very different pulse properties at the point of laser-matter interaction yielding unexpected interaction results. The mapping between far and near-field laser properties intricately depends on the spatial and angular dispersion properties as well as the focal geometry. For a focusing Gaussian laser pulse subject to angular, spatial, and group delay dispersion, we derive analytical expressions for its pulse-front tilt, duration, and width from a fully analytic expression for its electric field in time-space domain. This expression is not only valid in and near the focus but along the entire propagation distance from the focusing mirror to the focus. Together with expressions relating angular, spatial, and group delay dispersion before focusing at an off-axis parabola to the respective values in the pulse’s focus, these formulas are used to show in example setups that pulse-front tilts of lasers with small initial dispersion can become several ten degrees large in the vicinity of the focus while being small directly in the focus. The formulas derived here provide the analytical foundation for observations previously made in numerical experiments. By numerically simulating Gaussian pulse propagation and measuring properties of the pulse at distances several Rayleigh lengths off the focus we verified the analytic expressions.
Published: 2024

4. Data publication: Revealing the 3D structure of microbunched plasma-wakefield-accelerated electron beams

Author: (0000-0003-3089-4087) La Berge, M., (0000-0002-0487-4624) Bowers, B., (0000-0003-0548-3999) Chang, Y.-Y., (0000-0001-9129-4208) Couperus Cabadag, J., (0000-0002-3844-3697) Debus, A., Hannasch, A., (0000-0001-7990-9564) Pausch, R., (0000-0002-2769-4749) Schöbel, S., (0000-0001-9235-5287) Tiebel, J., (0000-0002-6463-5406) Ufer, P., Willmann, A., (0000-0003-4362-3438) Zarini, O., Zgadzaj, R., Lumpkin, A., (0000-0003-0390-7671) Schramm, U., (0000-0002-4626-0049) Irman, A., (0000-0003-1478-4582) Downer, M., (0000-0003-3089-4087) La Berge, M., (0000-0002-0487-4624) Bowers, B., (0000-0003-0548-3999) Chang, Y.-Y., (0000-0001-9129-4208) Couperus Cabadag, J., (0000-0002-3844-3697) Debus, A., Hannasch, A., (0000-0001-7990-9564) Pausch, R., (0000-0002-2769-4749) Schöbel, S., (0000-0001-9235-5287) Tiebel, J., (0000-0002-6463-5406) Ufer, P., Willmann, A., (0000-0003-4362-3438) Zarini, O., Zgadzaj, R., Lumpkin, A., (0000-0003-0390-7671) Schramm, U., (0000-0002-4626-0049) Irman, A., and (0000-0003-1478-4582) Downer, M.
Abstract: This repository contains data on coherent optical transition radiation (COTR) from laser wakefield accelerated electron beams. This includes raw (COTR) images and electron spectra, as well as analysis code for evaluating the COTR data and using it as an input for a differential-evolution-based reconstruction of the electron bunch.
Published: 2024

5. Source data: Revealing the 3D structure of microbunched plasma-wakefield-accelerated electron beams

Author: (0000-0003-3089-4087) La Berge, M., (0000-0002-0487-4624) Bowers, B., (0000-0003-0548-3999) Chang, Y.-Y., (0000-0001-9129-4208) Couperus Cabadag, J., (0000-0002-3844-3697) Debus, A., Hannasch, A., (0000-0001-7990-9564) Pausch, R., (0000-0002-2769-4749) Schöbel, S., (0000-0001-9235-5287) Tiebel, J., (0000-0002-6463-5406) Ufer, P., Willmann, A., (0000-0003-4362-3438) Zarini, O., Zgadzaj, R., Lumpkin, A., (0000-0002-4626-0049) Irman, A., (0000-0003-0390-7671) Schramm, U., (0000-0003-1478-4582) Downer, M., (0000-0003-3089-4087) La Berge, M., (0000-0002-0487-4624) Bowers, B., (0000-0003-0548-3999) Chang, Y.-Y., (0000-0001-9129-4208) Couperus Cabadag, J., (0000-0002-3844-3697) Debus, A., Hannasch, A., (0000-0001-7990-9564) Pausch, R., (0000-0002-2769-4749) Schöbel, S., (0000-0001-9235-5287) Tiebel, J., (0000-0002-6463-5406) Ufer, P., Willmann, A., (0000-0003-4362-3438) Zarini, O., Zgadzaj, R., Lumpkin, A., (0000-0002-4626-0049) Irman, A., (0000-0003-0390-7671) Schramm, U., and (0000-0003-1478-4582) Downer, M.
Abstract: Source data for the publication titled "Revealing the 3D structure of microbunched plasma-wakefield-accelerated electron beams."
Published: 2024

6. Machine Learning-based Data Analysis and Surrogate Modeling For COXINEL Experiment

Author: Willmann, A., (0000-0003-1064-489X) Ghaith, A., (0000-0003-0548-3999) Chang, Y.-Y., (0000-0002-3844-3697) Debus, A., (0000-0003-3089-4087) La Berge, M., Labat, M., (0000-0002-6463-5406) Ufer, P., (0000-0002-2769-4749) Schöbel, S., Hoffmann, N., (0000-0002-8258-3881) Bussmann, M., Couprie, M.-E., (0000-0003-0390-7671) Schramm, U., (0000-0002-4626-0049) Irman, A., Willmann, A., (0000-0003-1064-489X) Ghaith, A., (0000-0003-0548-3999) Chang, Y.-Y., (0000-0002-3844-3697) Debus, A., (0000-0003-3089-4087) La Berge, M., Labat, M., (0000-0002-6463-5406) Ufer, P., (0000-0002-2769-4749) Schöbel, S., Hoffmann, N., (0000-0002-8258-3881) Bussmann, M., Couprie, M.-E., (0000-0003-0390-7671) Schramm, U., and (0000-0002-4626-0049) Irman, A.
Abstract: Recently, free electron lasing at UV wavelength has been demonstrated by deploying the COXINEL beamline driven by HZDR plasma accelerator in a seeded configuration[1]. Further control and optimization of such an FEL radiation require full knowledge of strongly-coupled multivariate parameters involved in laser plasma acceleration, electron beam transport and radiation generation. For this purpose, one has to solve an inverse problem, i.e. finding matching parameters of the simulation to reproduce the experiment. Such inverse problems are ill-posed and cannot be easily resolved due to high computational complexity. Here, machine learning-based methods have a high potential to accelerate theoretical comprehension of the system, novel means for design space exploration and promise reliable in-situ analysis of experimental diagnostics and parameters. We apply simulation-based inference technique for this purpose. This method is a combination of deep learning and statistical approaches to resolve an inverse problem up to a posterior distribution of the simulation parameters given an experimental sample. In addition, we have developed machine learning-based surrogate models that can significantly accelerate forward computations for even faster results of the inverse solver. [1] M. Labat, et al. "Seeded free-electron laser in driven by a compact laser plasma accelerator", Nat. Photonics, 17, 150(2023)
Published: 2023

7. Machine Learning-based Data Analysis and Surrogate Modeling For COXINEL Experiment

Author: Willmann, A., Ghaith, A., Chang, Y.-Y., (0000-0002-3844-3697) Debus, A., (0000-0003-3089-4087) La Berge, M., Labat, M., (0000-0002-6463-5406) Ufer, P., (0000-0002-2769-4749) Schöbel, S., Hoffmann, N., (0000-0002-8258-3881) Bussmann, M., Couprie, M.-E., (0000-0003-0390-7671) Schramm, U., (0000-0002-4626-0049) Irman, A., Willmann, A., Ghaith, A., Chang, Y.-Y., (0000-0002-3844-3697) Debus, A., (0000-0003-3089-4087) La Berge, M., Labat, M., (0000-0002-6463-5406) Ufer, P., (0000-0002-2769-4749) Schöbel, S., Hoffmann, N., (0000-0002-8258-3881) Bussmann, M., Couprie, M.-E., (0000-0003-0390-7671) Schramm, U., and (0000-0002-4626-0049) Irman, A.
Abstract: Recently, free electron lasing at UV wavelength has been demonstrated by deploying the COXINEL beamline driven by HZDR plasma accelerator in a seeded configuration[1]. Further control and optimization of such an FEL radiation require full knowledge of strongly-coupled multivariate parameters involved in laser plasma acceleration, electron beam transport and radiation generation. For this purpose, one has to solve an inverse problem, i.e. finding matching parameters of the simulation to reproduce the experiment. Such inverse problems are ill-posed and cannot be easily resolved due to high computational complexity. Here, machine learning-based methods have a high potential to accelerate theoretical comprehension of the system, novel means for design space exploration and promise reliable in-situ analysis of experimental diagnostics and parameters. We apply simulation-based inference technique for this purpose. This method is a combination of deep learning and statistical approaches to resolve an inverse problem up to a posterior distribution of the simulation parameters given an experimental sample. In addition, we have developed machine learning-based surrogate models that can significantly accelerate forward computations for even faster results of the inverse solver. [1] M. Labat, et al. "Seeded free-electron laser in driven by a compact laser plasma accelerator", Nat. Photonics, 17, 150(2023)
Published: 2023

8. Machine Learning-based Data Analysis and Surrogate Modeling For COXINEL Experiment

Author: Willmann, A., Ghaith, A., Chang, Y.-Y., (0000-0002-3844-3697) Debus, A., (0000-0003-3089-4087) La Berge, M., Labat, M., (0000-0002-6463-5406) Ufer, P., (0000-0002-2769-4749) Schöbel, S., Hoffmann, N., (0000-0002-8258-3881) Bussmann, M., Couprie, M.-E., (0000-0003-0390-7671) Schramm, U., (0000-0002-4626-0049) Irman, A., Willmann, A., Ghaith, A., Chang, Y.-Y., (0000-0002-3844-3697) Debus, A., (0000-0003-3089-4087) La Berge, M., Labat, M., (0000-0002-6463-5406) Ufer, P., (0000-0002-2769-4749) Schöbel, S., Hoffmann, N., (0000-0002-8258-3881) Bussmann, M., Couprie, M.-E., (0000-0003-0390-7671) Schramm, U., and (0000-0002-4626-0049) Irman, A.
Abstract: Recently, free electron lasing at UV wavelength has been demonstrated by deploying the COXINEL beamline driven by HZDR plasma accelerator in a seeded configuration[1]. Further control and optimization of such an FEL radiation require full knowledge of strongly-coupled multivariate parameters involved in laser plasma acceleration, electron beam transport and radiation generation. For this purpose, one has to solve an inverse problem, i.e. finding matching parameters of the simulation to reproduce the experiment. Such inverse problems are ill-posed and cannot be easily resolved due to high computational complexity. Here, machine learning-based methods have a high potential to accelerate theoretical comprehension of the system, novel means for design space exploration and promise reliable in-situ analysis of experimental diagnostics and parameters. We apply simulation-based inference technique for this purpose. This method is a combination of deep learning and statistical approaches to resolve an inverse problem up to a posterior distribution of the simulation parameters given an experimental sample. In addition, we have developed machine learning-based surrogate models that can significantly accelerate forward computations for even faster results of the inverse solver. [1] M. Labat, et al. "Seeded free-electron laser in driven by a compact laser plasma accelerator", Nat. Photonics, 17, 150(2023)
Published: 2023

9. Machine Learning-based Data Analysis and Surrogate Modeling For COXINEL Experiment

Author: Willmann, A., Ghaith, A., Chang, Y.-Y., (0000-0002-3844-3697) Debus, A., (0000-0003-3089-4087) La Berge, M., Labat, M., (0000-0002-6463-5406) Ufer, P., (0000-0002-2769-4749) Schöbel, S., Hoffmann, N., (0000-0002-8258-3881) Bussmann, M., Couprie, M.-E., (0000-0003-0390-7671) Schramm, U., (0000-0002-4626-0049) Irman, A., Willmann, A., Ghaith, A., Chang, Y.-Y., (0000-0002-3844-3697) Debus, A., (0000-0003-3089-4087) La Berge, M., Labat, M., (0000-0002-6463-5406) Ufer, P., (0000-0002-2769-4749) Schöbel, S., Hoffmann, N., (0000-0002-8258-3881) Bussmann, M., Couprie, M.-E., (0000-0003-0390-7671) Schramm, U., and (0000-0002-4626-0049) Irman, A.
Abstract: Recently, free electron lasing at UV wavelength has been demonstrated by deploying the COXINEL beamline driven by HZDR plasma accelerator in a seeded configuration[1]. Further control and optimization of such an FEL radiation require full knowledge of strongly-coupled multivariate parameters involved in laser plasma acceleration, electron beam transport and radiation generation. For this purpose, one has to solve an inverse problem, i.e. finding matching parameters of the simulation to reproduce the experiment. Such inverse problems are ill-posed and cannot be easily resolved due to high computational complexity. Here, machine learning-based methods have a high potential to accelerate theoretical comprehension of the system, novel means for design space exploration and promise reliable in-situ analysis of experimental diagnostics and parameters. We apply simulation-based inference technique for this purpose. This method is a combination of deep learning and statistical approaches to resolve an inverse problem up to a posterior distribution of the simulation parameters given an experimental sample. In addition, we have developed machine learning-based surrogate models that can significantly accelerate forward computations for even faster results of the inverse solver. [1] M. Labat, et al. "Seeded free-electron laser in driven by a compact laser plasma accelerator", Nat. Photonics, 17, 150(2023)
Published: 2023

10. What is going on in a laser plasma wakefield accelerator (LPWFA)? - a theoretical perspective on the hybrid concept

Author: (0000-0001-7990-9564) Pausch, R., (0000-0002-8258-3881) Bussmann, M., Assmann, R. W., Corde, S., Couperus Cabadağ, J., Chang, Y.-Y., Ding, H., Döpp, A., Gilljohann, M. F., Götzfried, J., Heinemann, T., Hidding, B., Karsch, S., (0000-0001-9759-1166) Köhler, A., Kononenko, O., Kurz, T., Martinez De La Ossa, A., Raj, G., (0000-0002-2769-4749) Schöbel, S., (0000-0001-8965-1149) Steiniger, K., Schindler, S., (0000-0003-4362-3438) Zarini, O., (0000-0002-4626-0049) Irman, A., (0000-0003-0390-7671) Schramm, U., (0000-0002-3844-3697) Debus, A., (0000-0001-7990-9564) Pausch, R., (0000-0002-8258-3881) Bussmann, M., Assmann, R. W., Corde, S., Couperus Cabadağ, J., Chang, Y.-Y., Ding, H., Döpp, A., Gilljohann, M. F., Götzfried, J., Heinemann, T., Hidding, B., Karsch, S., (0000-0001-9759-1166) Köhler, A., Kononenko, O., Kurz, T., Martinez De La Ossa, A., Raj, G., (0000-0002-2769-4749) Schöbel, S., (0000-0001-8965-1149) Steiniger, K., Schindler, S., (0000-0003-4362-3438) Zarini, O., (0000-0002-4626-0049) Irman, A., (0000-0003-0390-7671) Schramm, U., and (0000-0002-3844-3697) Debus, A.
Abstract: The combination of laser wakefield acceleration (LWFA) with plasma wakefield acceleration (PWFA) provides a miniaturized testbed for the study of PWFA. Since the first experimental implementation of this hybrid concept, various driver generation methods and witness injection have been investigated. Extensive simulation studies accompanied these experiments and provided insights into the complex interplay between the individual stages and the processes occurring within them. This real-world implementation allowed us to revisit and refine the original concepts. Here we present this revised implementation guide for LPWFA. Derived from these simulation campaigns, we present a theoretical analysis of the processes relevant to LPWFA hybrid accelerators. Requirements and possible methods for generating a driver package in the LWFA stage are discussed, and different laser extraction techniques are compared. The driver evolution in the PWFA stage is studied and the implications for performance limits relevant to current experiments are discussed. Different witness generation methods are also compared in terms of reproducibility and beam quality. The analysis is based on 3D3V particle-in-cell simulations performed with PIConGPU. Its 3D capability and efficiency allows studying non-rotational effects such as oblique density profiles of shocks and higher laser modes originating from experimental measurements. Their influences are briefly discussed, as well as general requirements on start-to-end simulations.
Published: 2023

11. Machine Learning-based Data Analysis and Surrogate Modeling For COXINEL Experiment

Author: Willmann, A., (0000-0003-1064-489X) Ghaith, A., (0000-0003-0548-3999) Chang, Y.-Y., (0000-0002-3844-3697) Debus, A., (0000-0003-3089-4087) La Berge, M., Labat, M., (0000-0002-6463-5406) Ufer, P., (0000-0002-2769-4749) Schöbel, S., Hoffmann, N., (0000-0002-8258-3881) Bussmann, M., Couprie, M.-E., (0000-0003-0390-7671) Schramm, U., (0000-0002-4626-0049) Irman, A., Willmann, A., (0000-0003-1064-489X) Ghaith, A., (0000-0003-0548-3999) Chang, Y.-Y., (0000-0002-3844-3697) Debus, A., (0000-0003-3089-4087) La Berge, M., Labat, M., (0000-0002-6463-5406) Ufer, P., (0000-0002-2769-4749) Schöbel, S., Hoffmann, N., (0000-0002-8258-3881) Bussmann, M., Couprie, M.-E., (0000-0003-0390-7671) Schramm, U., and (0000-0002-4626-0049) Irman, A.
Abstract: Recently, free electron lasing at UV wavelength has been demonstrated by deploying the COXINEL beamline driven by HZDR plasma accelerator in a seeded configuration[1]. Further control and optimization of such an FEL radiation require full knowledge of strongly-coupled multivariate parameters involved in laser plasma acceleration, electron beam transport and radiation generation. For this purpose, one has to solve an inverse problem, i.e. finding matching parameters of the simulation to reproduce the experiment. Such inverse problems are ill-posed and cannot be easily resolved due to high computational complexity. Here, machine learning-based methods have a high potential to accelerate theoretical comprehension of the system, novel means for design space exploration and promise reliable in-situ analysis of experimental diagnostics and parameters. We apply simulation-based inference technique for this purpose. This method is a combination of deep learning and statistical approaches to resolve an inverse problem up to a posterior distribution of the simulation parameters given an experimental sample. In addition, we have developed machine learning-based surrogate models that can significantly accelerate forward computations for even faster results of the inverse solver. [1] M. Labat, et al. "Seeded free-electron laser in driven by a compact laser plasma accelerator", Nat. Photonics, 17, 150(2023)
Published: 2023

12. Reduction of the electron beam divergence of laser wakefield-accelerators by integrated plamsa lens

Author: (0000-0003-0548-3999) Chang, Y.-Y., (0000-0001-9129-4208) Couperus Cabadağ, J. P., (0000-0002-3844-3697) Debus, A., (0000-0003-1064-489X) Ghaith, A., (0000-0003-3089-4087) La Berge, M., (0000-0001-7990-9564) Pausch, R., (0000-0002-2769-4749) Schöbel, S., (0000-0002-6463-5406) Ufer, P., (0000-0003-0390-7671) Schramm, U., (0000-0002-4626-0049) Irman, A., (0000-0003-0548-3999) Chang, Y.-Y., (0000-0001-9129-4208) Couperus Cabadağ, J. P., (0000-0002-3844-3697) Debus, A., (0000-0003-1064-489X) Ghaith, A., (0000-0003-3089-4087) La Berge, M., (0000-0001-7990-9564) Pausch, R., (0000-0002-2769-4749) Schöbel, S., (0000-0002-6463-5406) Ufer, P., (0000-0003-0390-7671) Schramm, U., and (0000-0002-4626-0049) Irman, A.
Abstract: We report on electron beam collimation using a passive plasma lens, integrated directly and conveniently into a laser wakefield accelerator stage operating in the high charge regime. The lens is created by reshaping the gas density profile of a super-sonic jet at the beam's exit side through an obstacle mounted above the jet. It reduces the beam's divergence by a factor of two to below 1 mrad (root-mean-square), while preserving the total charge of 170 pC and maintaining the energy spread. The resulting spectral-charge density, here defined as the charge per energy bandwidth and emission angle, of up to 7 pC/(MeV·mrad) played a key role in the recent experimental demonstration of free-electron lasing. The presented simple and robust gas shaping technique holds the potential to generate specific density profiles, essential for the application of adiabatic focusing or staging of accelerators.
Published: 2023

13. Progress in Hybrid Plasma Wakefield Acceleration

Author: (0000-0002-5827-0041) Hidding, B., (0000-0003-3440-7717) Assmann, R., (0000-0002-8258-3881) Bussmann, M., (0000-0003-0459-6326) Campbell, D., (0000-0003-0548-3999) Chang, Y.-Y., (0000-0002-5015-0387) Corde, S., (0000-0001-9129-4208) Couperus Cabadağ, J. P., (0000-0002-3844-3697) Debus, A., (0000-0003-2913-5729) Döpp, A., Gilljohann, M., Götzfried, J., (0000-0002-5886-0834) Moritz Foerster, F., (0000-0001-8297-0198) Haberstroh, F., (0000-0003-2108-8702) Habib, F., (0000-0001-7747-1650) Heinemann, T., Hollatz, D., (0000-0002-4626-0049) Irman, A., Kaluza, M., (0000-0003-0746-0731) Karsch, S., (0000-0003-1757-0985) Kononenko, O., (0000-0001-7289-9228) Knetsch, A., (0000-0003-0340-9963) Kurz, T., Kuschel, S., (0000-0001-9759-1166) Köhler, A., Martinez De La Ossa, A., Nutter, A., (0000-0001-7990-9564) Pausch, R., Raj, G., (0000-0003-0390-7671) Schramm, U., (0000-0002-2769-4749) Schöbel, S., Seidel, A., (0000-0001-8965-1149) Steiniger, K., (0000-0002-6463-5406) Ufer, P., Yeung, M., (0000-0003-4362-3438) Zarini, O., Zepf, M., (0000-0002-5827-0041) Hidding, B., (0000-0003-3440-7717) Assmann, R., (0000-0002-8258-3881) Bussmann, M., (0000-0003-0459-6326) Campbell, D., (0000-0003-0548-3999) Chang, Y.-Y., (0000-0002-5015-0387) Corde, S., (0000-0001-9129-4208) Couperus Cabadağ, J. P., (0000-0002-3844-3697) Debus, A., (0000-0003-2913-5729) Döpp, A., Gilljohann, M., Götzfried, J., (0000-0002-5886-0834) Moritz Foerster, F., (0000-0001-8297-0198) Haberstroh, F., (0000-0003-2108-8702) Habib, F., (0000-0001-7747-1650) Heinemann, T., Hollatz, D., (0000-0002-4626-0049) Irman, A., Kaluza, M., (0000-0003-0746-0731) Karsch, S., (0000-0003-1757-0985) Kononenko, O., (0000-0001-7289-9228) Knetsch, A., (0000-0003-0340-9963) Kurz, T., Kuschel, S., (0000-0001-9759-1166) Köhler, A., Martinez De La Ossa, A., Nutter, A., (0000-0001-7990-9564) Pausch, R., Raj, G., (0000-0003-0390-7671) Schramm, U., (0000-0002-2769-4749) Schöbel, S., Seidel, A., (0000-0001-8965-1149) Steiniger, K., (0000-0002-6463-5406) Ufer, P., Yeung, M., (0000-0003-4362-3438) Zarini, O., and Zepf, M.
Abstract: Plasma wakefield accelerators can be driven either by intense laser pulses (LWFA) or by intense particle beams (PWFA). A third approach that combines the complementary advantages of both types of plasma wakefield accelerator has been established with increasing success over the last decade and is called hybrid LWFA→PWFA. Essentially, a compact LWFA is exploited to produce an energetic, high-current electron beam as a driver for a subsequent PWFA stage, which, in turn, is exploited for phase-constant, inherently laser-synchronized, quasi-static acceleration over extended acceleration lengths. The sum is greater than its parts: the approach not only provides a compact, cost-effective alternative to linac-driven PWFA for exploitation of PWFA and its advantages for acceleration and high-brightness beam generation, but extends the parameter range accessible for PWFA and, through the added benefit of co-location of inherently synchronized laser pulses, enables high-precision pump/probing, injection, seeding and unique experimental constellations, e.g., for beam coordination and collision experiments. We report on the accelerating progress of the approach achieved in a series of collaborative experiments and discuss future prospects and potential impact.
Published: 2023

14. Seeded free-electron laser driven by a compact laser plasma accelerator

Author: Labat, M., (0000-0001-9129-4208) Couperus Cabadağ, J. P., (0000-0003-1064-489X) Ghaith, A., (0000-0002-4626-0049) Irman, A., Berlioux, A., Berteaud, P., Blache, F., (0000-0002-1919-8585) Bock, S., Bouvet, F., Briquez, F., (0000-0003-0548-3999) Chang, Y.-Y., Corde, S., (0000-0002-3844-3697) Debus, A., Oliveira, C., Duval, J.-P., Dietrich, Y., El Ajjouri, M., Eisenmann, C., Gautier, J., Gebhardt, R., Grams, S., Helbig, U., Herbeaux, C., Hubert, N., Kitegi, C., Kononenko, O., (0000-0002-8145-5837) Kuntzsch, M., (0000-0003-3089-4087) La Berge, M., Le, S., Leluan, B., Loulergue, A., Malka, V., Marteau, F., Huy N. Guyen, M., Oumbarek-Espinos, D., (0000-0001-7990-9564) Pausch, R., Pereira, D., (0000-0002-4738-6436) Püschel, T., Ricaud, J.-P., Rommeluere, P., Roussel, E., Rousseau, P., (0000-0002-2769-4749) Schöbel, S., Sebdaoui, M., (0000-0001-8965-1149) Steiniger, K., Tavakoli, K., Thaury, C., (0000-0002-6463-5406) Ufer, P., Valleau, M., Vandenberghe, M., Veteran, J., (0000-0003-0390-7671) Schramm, U., Couprie, M.-E., Labat, M., (0000-0001-9129-4208) Couperus Cabadağ, J. P., (0000-0003-1064-489X) Ghaith, A., (0000-0002-4626-0049) Irman, A., Berlioux, A., Berteaud, P., Blache, F., (0000-0002-1919-8585) Bock, S., Bouvet, F., Briquez, F., (0000-0003-0548-3999) Chang, Y.-Y., Corde, S., (0000-0002-3844-3697) Debus, A., Oliveira, C., Duval, J.-P., Dietrich, Y., El Ajjouri, M., Eisenmann, C., Gautier, J., Gebhardt, R., Grams, S., Helbig, U., Herbeaux, C., Hubert, N., Kitegi, C., Kononenko, O., (0000-0002-8145-5837) Kuntzsch, M., (0000-0003-3089-4087) La Berge, M., Le, S., Leluan, B., Loulergue, A., Malka, V., Marteau, F., Huy N. Guyen, M., Oumbarek-Espinos, D., (0000-0001-7990-9564) Pausch, R., Pereira, D., (0000-0002-4738-6436) Püschel, T., Ricaud, J.-P., Rommeluere, P., Roussel, E., Rousseau, P., (0000-0002-2769-4749) Schöbel, S., Sebdaoui, M., (0000-0001-8965-1149) Steiniger, K., Tavakoli, K., Thaury, C., (0000-0002-6463-5406) Ufer, P., Valleau, M., Vandenberghe, M., Veteran, J., (0000-0003-0390-7671) Schramm, U., and Couprie, M.-E.
Abstract: Seeded free-electron laser driven by a compact laser plasma accelerator Free-electron lasers generate high-brilliance coherent radiation at wavelengths spanning from the infrared to the X-ray domains. The recent development of short-wavelength seeded free-electron lasers now allows for unprecedented levels of control on longitudinal coherence, opening new scientific avenues such as ultra-fast dynamics on complex systems and X-ray nonlinear optics. Although those devices rely on state-of-the-art large-scale accelerators, advancements on laser-plasma accelerators, which harness gigavolt-per-centimetre accelerating fields, showcase a promising technology as compact drivers for free-electron lasers. Using such footprint-reduced accelerators, exponential amplification of a shot-noise type of radiation in a self-amplified spontaneous emission configuration was recently achieved. However, employing this compact approach for the delivery of temporally coherent pulses in a controlled manner has remained a major challenge. Here we present the experimental demonstration of a laser-plasma accelerator-driven free-electron laser in a seeded configuration, where control over the radiation wavelength is accomplished. Furthermore, the appearance of interference fringes, resulting from the interaction between the phase-locked emitted radiation and the seed, confirms longitudinal coherence. Building on our scientific achievements, we anticipate a navigable pathway to extreme-ultraviolet wavelengths, paving the way towards smaller-scale free-electron lasers, unique tools for a multitude of applications in industry, laboratories and universities.
Published: 2023

15. Machine Learning-based Data Analysis and Surrogate Modeling For COXINEL Experiment

Author: Willmann, A., (0000-0003-1064-489X) Ghaith, A., (0000-0003-0548-3999) Chang, Y.-Y., (0000-0002-3844-3697) Debus, A., (0000-0003-3089-4087) La Berge, M., Labat, M., (0000-0002-6463-5406) Ufer, P., (0000-0002-2769-4749) Schöbel, S., Hoffmann, N., (0000-0002-8258-3881) Bussmann, M., Couprie, M.-E., (0000-0003-0390-7671) Schramm, U., (0000-0002-4626-0049) Irman, A., Willmann, A., (0000-0003-1064-489X) Ghaith, A., (0000-0003-0548-3999) Chang, Y.-Y., (0000-0002-3844-3697) Debus, A., (0000-0003-3089-4087) La Berge, M., Labat, M., (0000-0002-6463-5406) Ufer, P., (0000-0002-2769-4749) Schöbel, S., Hoffmann, N., (0000-0002-8258-3881) Bussmann, M., Couprie, M.-E., (0000-0003-0390-7671) Schramm, U., and (0000-0002-4626-0049) Irman, A.
Abstract: Recently, free electron lasing at UV wavelength has been demonstrated by deploying the COXINEL beamline driven by HZDR plasma accelerator in a seeded configuration[1]. Further control and optimization of such an FEL radiation require full knowledge of strongly-coupled multivariate parameters involved in laser plasma acceleration, electron beam transport and radiation generation. For this purpose, one has to solve an inverse problem, i.e. finding matching parameters of the simulation to reproduce the experiment. Such inverse problems are ill-posed and cannot be easily resolved due to high computational complexity. Here, machine learning-based methods have a high potential to accelerate theoretical comprehension of the system, novel means for design space exploration and promise reliable in-situ analysis of experimental diagnostics and parameters. We apply simulation-based inference technique for this purpose. This method is a combination of deep learning and statistical approaches to resolve an inverse problem up to a posterior distribution of the simulation parameters given an experimental sample. In addition, we have developed machine learning-based surrogate models that can significantly accelerate forward computations for even faster results of the inverse solver. [1] M. Labat, et al. "Seeded free-electron laser in driven by a compact laser plasma accelerator", Nat. Photonics, 17, 150(2023)
Published: 2023

16. What is going on in a laser plasma wakefield accelerator (LPWFA)? - a theoretical perspective on the hybrid concept

Author: (0000-0001-7990-9564) Pausch, R., (0000-0002-8258-3881) Bussmann, M., Assmann, R. W., Corde, S., Couperus Cabadağ, J., (0000-0003-0548-3999) Chang, Y.-Y., Ding, H., Döpp, A., Gilljohann, M. F., Götzfried, J., Heinemann, T., Hidding, B., Karsch, S., (0000-0001-9759-1166) Köhler, A., Kononenko, O., Kurz, T., Martinez De La Ossa, A., Raj, G., (0000-0002-2769-4749) Schöbel, S., (0000-0001-8965-1149) Steiniger, K., Schindler, S., (0000-0003-4362-3438) Zarini, O., (0000-0002-4626-0049) Irman, A., (0000-0003-0390-7671) Schramm, U., (0000-0002-3844-3697) Debus, A., (0000-0001-7990-9564) Pausch, R., (0000-0002-8258-3881) Bussmann, M., Assmann, R. W., Corde, S., Couperus Cabadağ, J., (0000-0003-0548-3999) Chang, Y.-Y., Ding, H., Döpp, A., Gilljohann, M. F., Götzfried, J., Heinemann, T., Hidding, B., Karsch, S., (0000-0001-9759-1166) Köhler, A., Kononenko, O., Kurz, T., Martinez De La Ossa, A., Raj, G., (0000-0002-2769-4749) Schöbel, S., (0000-0001-8965-1149) Steiniger, K., Schindler, S., (0000-0003-4362-3438) Zarini, O., (0000-0002-4626-0049) Irman, A., (0000-0003-0390-7671) Schramm, U., and (0000-0002-3844-3697) Debus, A.
Abstract: The combination of laser wakefield acceleration (LWFA) with plasma wakefield acceleration (PWFA) provides a miniaturized testbed for the study of PWFA. Since the first experimental implementation of this hybrid concept, various driver generation methods and witness injection have been investigated. Extensive simulation studies accompanied these experiments and provided insights into the complex interplay between the individual stages and the processes occurring within them. This real-world implementation allowed us to revisit and refine the original concepts. Here we present this revised implementation guide for LPWFA. Derived from these simulation campaigns, we present a theoretical analysis of the processes relevant to LPWFA hybrid accelerators. Requirements and possible methods for generating a driver package in the LWFA stage are discussed, and different laser extraction techniques are compared. The driver evolution in the PWFA stage is studied and the implications for performance limits relevant to current experiments are discussed. Different witness generation methods are also compared in terms of reproducibility and beam quality. The analysis is based on 3D3V particle-in-cell simulations performed with PIConGPU. Its 3D capability and efficiency allows studying non-rotational effects such as oblique density profiles of shocks and higher laser modes originating from experimental measurements. Their influences are briefly discussed, as well as general requirements on start-to-end simulations.
Published: 2023

17. Machine Learning-based Data Analysis and Surrogate Modeling For COXINEL Experiment

Author: Willmann, A., Ghaith, A., Chang, Y.-Y., (0000-0002-3844-3697) Debus, A., (0000-0003-3089-4087) La Berge, M., Labat, M., (0000-0002-6463-5406) Ufer, P., (0000-0002-2769-4749) Schöbel, S., Hoffmann, N., (0000-0002-8258-3881) Bussmann, M., Couprie, M.-E., (0000-0003-0390-7671) Schramm, U., (0000-0002-4626-0049) Irman, A., Willmann, A., Ghaith, A., Chang, Y.-Y., (0000-0002-3844-3697) Debus, A., (0000-0003-3089-4087) La Berge, M., Labat, M., (0000-0002-6463-5406) Ufer, P., (0000-0002-2769-4749) Schöbel, S., Hoffmann, N., (0000-0002-8258-3881) Bussmann, M., Couprie, M.-E., (0000-0003-0390-7671) Schramm, U., and (0000-0002-4626-0049) Irman, A.
Abstract: Recently, free electron lasing at UV wavelength has been demonstrated by deploying the COXINEL beamline driven by HZDR plasma accelerator in a seeded configuration[1]. Further control and optimization of such an FEL radiation require full knowledge of strongly-coupled multivariate parameters involved in laser plasma acceleration, electron beam transport and radiation generation. For this purpose, one has to solve an inverse problem, i.e. finding matching parameters of the simulation to reproduce the experiment. Such inverse problems are ill-posed and cannot be easily resolved due to high computational complexity. Here, machine learning-based methods have a high potential to accelerate theoretical comprehension of the system, novel means for design space exploration and promise reliable in-situ analysis of experimental diagnostics and parameters. We apply simulation-based inference technique for this purpose. This method is a combination of deep learning and statistical approaches to resolve an inverse problem up to a posterior distribution of the simulation parameters given an experimental sample. In addition, we have developed machine learning-based surrogate models that can significantly accelerate forward computations for even faster results of the inverse solver. [1] M. Labat, et al. "Seeded free-electron laser in driven by a compact laser plasma accelerator", Nat. Photonics, 17, 150(2023)
Published: 2023

18. Unravelling ultrashort dynamics of plasma-based accelerators -- leveraging synthetic diagnostics to match PIC simulations with experimental data

Author: (0000-0002-3844-3697) Debus, A., (0000-0001-7990-9564) Pausch, R., (0000-0001-8965-1149) Steiniger, K., (0009-0008-0365-5164) Carstens, F.-O., (0000-0001-9235-5287) Tiebel, J., (0000-0003-1642-0459) Widera, R., Narwal, T., (0000-0001-7042-5088) Pöschel, F., Willmann, A., (0000-0003-1761-2591) Kelling, J., (0000-0003-3089-4087) La Berge, M., (0000-0002-2769-4749) Schöbel, S., (0000-0003-0548-3999) Chang, Y.-Y., (0000-0002-2828-5373) Vescovi Pinochet, M. A., (0000-0003-4861-5584) Kluge, T., Gutta, V., Hernandez Arreguin, B., (0000-0002-5187-1768) Rogers, D., (0000-0001-9841-4057) Young, J., Joubert, W., (0000-0002-6788-1047) Hoffmann, N., (0000-0002-9935-4428) Juckeland, G., (0000-0002-4626-0049) Irman, A., (0000-0002-3560-9428) Chandrasekaran, S., (0000-0003-0390-7671) Schramm, U., (0000-0002-8258-3881) Bussmann, M., (0000-0002-3844-3697) Debus, A., (0000-0001-7990-9564) Pausch, R., (0000-0001-8965-1149) Steiniger, K., (0009-0008-0365-5164) Carstens, F.-O., (0000-0001-9235-5287) Tiebel, J., (0000-0003-1642-0459) Widera, R., Narwal, T., (0000-0001-7042-5088) Pöschel, F., Willmann, A., (0000-0003-1761-2591) Kelling, J., (0000-0003-3089-4087) La Berge, M., (0000-0002-2769-4749) Schöbel, S., (0000-0003-0548-3999) Chang, Y.-Y., (0000-0002-2828-5373) Vescovi Pinochet, M. A., (0000-0003-4861-5584) Kluge, T., Gutta, V., Hernandez Arreguin, B., (0000-0002-5187-1768) Rogers, D., (0000-0001-9841-4057) Young, J., Joubert, W., (0000-0002-6788-1047) Hoffmann, N., (0000-0002-9935-4428) Juckeland, G., (0000-0002-4626-0049) Irman, A., (0000-0002-3560-9428) Chandrasekaran, S., (0000-0003-0390-7671) Schramm, U., and (0000-0002-8258-3881) Bussmann, M.
Abstract: Exascale computing has recently become a reality. PIConGPU has paved the way to accelerating plasma simulations across compute platforms using the Alpaka framework. These capabilities not only enables conducting high-fidelity parameter scans of start-to-end simulations modeling experiments at full 3D3V geometry, but also make it possible to include additional physics. However, experience has shown that the real challenges are of a different nature. Not only has the increasing quality of experiments put more demand on simulation quality, but more and more the need for fast analysis has grown. Based on recent experiment-driven simulation campaigns, we present results elucidating the LWFA bunch evolution within complex gas targets with plasma lensing, the injection dynamics of micro-structured LWFA bunches from CTR measurements and the pre-plasma dynamics in solid-density targets, correlating proton energies with reflected HHG radiation spectra. Here, we put an emphasis on synthetic diagnostics for radiation processes (HHG, CTR and scattered probe lasers) and atomic physics beyond the thermal equilibrium. We discuss I/O, code coupling, visual analytics and large-scale data analytics workflows to match experiment and provide an outlook on how feedback loops between experiment and simulation can be optimized.
Published: 2023

19. Gas-dynamic density downramp injection in a beam-driven plasma wakefield accelerator

Author: (0000-0001-9129-4208) Couperus Cabadağ, J. P., (0000-0001-7990-9564) Pausch, R., (0000-0002-2769-4749) Schöbel, S., (0000-0002-8258-3881) Bussmann, M., (0000-0003-0548-3999) Chang, Y.-Y., Corde, S., (0000-0002-3844-3697) Debus, A., Ding, H., Dopp, A., Foerster, F. M., Gilljohann, M., Haberstroh, F., Heinemann, T., Hidding, B., Karsch, S., (0000-0001-9759-1166) Köhler, A., Kononenko, O., Knetsch, A., Kurz, T., Martinez De La Ossa, A., Nutter, A., Raj, G., (0000-0001-8965-1149) Steiniger, K., (0000-0003-0390-7671) Schramm, U., (0000-0002-6463-5406) Ufer, P., (0000-0002-4626-0049) Irman, A., (0000-0001-9129-4208) Couperus Cabadağ, J. P., (0000-0001-7990-9564) Pausch, R., (0000-0002-2769-4749) Schöbel, S., (0000-0002-8258-3881) Bussmann, M., (0000-0003-0548-3999) Chang, Y.-Y., Corde, S., (0000-0002-3844-3697) Debus, A., Ding, H., Dopp, A., Foerster, F. M., Gilljohann, M., Haberstroh, F., Heinemann, T., Hidding, B., Karsch, S., (0000-0001-9759-1166) Köhler, A., Kononenko, O., Knetsch, A., Kurz, T., Martinez De La Ossa, A., Nutter, A., Raj, G., (0000-0001-8965-1149) Steiniger, K., (0000-0003-0390-7671) Schramm, U., (0000-0002-6463-5406) Ufer, P., and (0000-0002-4626-0049) Irman, A.
Abstract: We present the experimental demonstration of density downramp injection at a gas-dynamic shock in a beam-driven plasma accelerator. The ultrashort driver electron beam with a peak-current exceeding 10 kA allows operation in the blowout regime and enables injection of electron witness bunches at gentle density ramps, i.e. longer than the plasma wavelength, which nurtures prospects for ultralow bunch emittance. By precision control over the position of injection we show that these bunches can be energy-tuned in acceleration gradients of near 120 GV/m.
Published: 2022

20. Beam driven wakefield characteristics probed by femtosecond-scale shadowgraphy

Author: (0000-0002-2769-4749) Schöbel, S., (0000-0001-7990-9564) Pausch, R., Chang, Y.-Y., (0000-0002-5015-0387) Corde, S., (0000-0001-9129-4208) Couperus Cabadağ, J. P., (0000-0002-3844-3697) Debus, A., (0000-0003-4713-0331) Ding, H., (0000-0003-2913-5729) Döpp, A., (0000-0002-5886-0834) Förster, M., Gilljohann, M., Haberstroh, F., (0000-0001-7747-1650) Heinemann, T., (0000-0002-5827-0041) Hidding, B., (0000-0003-0746-0731) Karsch, S., (0000-0001-9759-1166) Köhler, A., (0000-0003-1757-0985) Kononenko, O., Nutter, A., (0000-0001-8965-1149) Steiniger, K., Ufer, P., (0000-0001-8158-0980) Martinez De La Ossa, A., (0000-0003-0390-7671) Schramm, U., (0000-0002-4626-0049) Irman, A., (0000-0002-2769-4749) Schöbel, S., (0000-0001-7990-9564) Pausch, R., Chang, Y.-Y., (0000-0002-5015-0387) Corde, S., (0000-0001-9129-4208) Couperus Cabadağ, J. P., (0000-0002-3844-3697) Debus, A., (0000-0003-4713-0331) Ding, H., (0000-0003-2913-5729) Döpp, A., (0000-0002-5886-0834) Förster, M., Gilljohann, M., Haberstroh, F., (0000-0001-7747-1650) Heinemann, T., (0000-0002-5827-0041) Hidding, B., (0000-0003-0746-0731) Karsch, S., (0000-0001-9759-1166) Köhler, A., (0000-0003-1757-0985) Kononenko, O., Nutter, A., (0000-0001-8965-1149) Steiniger, K., Ufer, P., (0000-0001-8158-0980) Martinez De La Ossa, A., (0000-0003-0390-7671) Schramm, U., and (0000-0002-4626-0049) Irman, A.
Abstract: High peak current electron beams from laser wakefield accelerators (LWFA) are capable to drive a particle driven wakefield (PWFA) in a subsequent stage. The intrinsic short duration of these driver beams opens the possibility for PWFA studies in a higher density regime of the order of 1018·cm-3. Since optical probing provides a reasonable contrast at this density range, direct insight into the particle-driven wakefields is possible. Here we present the results of femtosecond optical probing of such beam driven wakefields, showing pronounced differences in the morphology of beam driven plasma waves when surrounded by either neutral gas or a broad pre-generated plasma channel. Moreover, the shape and size of the first cavity of the wakefields correlates with the driver beam charge. The experimental results are supported by 3D particle-in-cell simulations performed with PIConGPU. This method can be extended to a detailed study of driver charge depletion by probing the evolution of the wakefield as it propagates through the plasma. This is an important step for further understanding and optimization of high energy efficiency PWFAs.
Published: 2022

21. Demonstration of Trojan horse injection in a hybrid LWFA-driven PWFA

Author: (0000-0002-6463-5406) Ufer, P., Nutter, A., Chang, Y.-Y., (0000-0002-5015-0387) Corde, S., (0000-0001-9129-4208) Couperus Cabadağ, J. P., (0000-0002-3844-3697) Debus, A., (0000-0003-2913-5729) Döpp, A., (0000-0002-5886-0834) Moritz Foerster, F., Gilljohann, M., (0000-0001-7747-1650) Heinemann, T., (0000-0002-5827-0041) Hidding, B., (0000-0003-0746-0731) Karsch, S., (0000-0001-9759-1166) Köhler, A., (0000-0003-1757-0985) Kononenko, O., (0000-0001-7990-9564) Pausch, R., (0000-0002-2769-4749) Schöbel, S., (0000-0001-8158-0980) Martinez De La Ossa, A., (0000-0003-0390-7671) Schramm, U., (0000-0002-4626-0049) Irman, A., (0000-0002-6463-5406) Ufer, P., Nutter, A., Chang, Y.-Y., (0000-0002-5015-0387) Corde, S., (0000-0001-9129-4208) Couperus Cabadağ, J. P., (0000-0002-3844-3697) Debus, A., (0000-0003-2913-5729) Döpp, A., (0000-0002-5886-0834) Moritz Foerster, F., Gilljohann, M., (0000-0001-7747-1650) Heinemann, T., (0000-0002-5827-0041) Hidding, B., (0000-0003-0746-0731) Karsch, S., (0000-0001-9759-1166) Köhler, A., (0000-0003-1757-0985) Kononenko, O., (0000-0001-7990-9564) Pausch, R., (0000-0002-2769-4749) Schöbel, S., (0000-0001-8158-0980) Martinez De La Ossa, A., (0000-0003-0390-7671) Schramm, U., and (0000-0002-4626-0049) Irman, A.
Abstract: In a hybrid LWFA-driven PWFA (LPWFA) electron beams from a laser wakefield acceleration (LWFA) stage are utilized to drive a plasma wave in a subsequent plasma wakefield acceleration (PWFA) stage for acceleration of witness electron bunches to high energies. This concept allows for the exploration of PWFA-physics in a compact setup and harnessing the advantages of both plasma acceleration schemes in order to generate high-quality electron beams. Here we present results of Trojan horse injection in this hybrid plasma acceleration configuration. The DRACO laser is focused onto a gas target (LWFA stage), creating a plasma wakefield to accelerate a high peak current electron bunch. While such a beam is propagating in the second gas jet (PWFA stage), consisting of a mixture of high and low ionization threshold gas, an auxiliary low energy laser pulse intercepts the generated wakefield perpendicularly to release electrons from the highest ionization level in the first cavity. The generated witness beams show improved beam quality, such as lower energy spread compared to the drive electron beam. The realization of Trojan horse injection in LPWFA is a further step towards applications based on high brightness electron beams such as free electron lasers.
Published: 2022

22. Beam driven wakefield characteristics probed by femtosecond-scale shadowgraphy

Author: (0000-0002-2769-4749) Schöbel, S., (0000-0001-7990-9564) Pausch, R., Chang, Y.-Y., (0000-0002-5015-0387) Corde, S., (0000-0001-9129-4208) Couperus Cabadağ, J. P., (0000-0002-3844-3697) Debus, A., (0000-0003-4713-0331) Ding, H., (0000-0003-2913-5729) Döpp, A., (0000-0002-5886-0834) Förster, M., Gilljohann, M., Haberstroh, F., (0000-0001-7747-1650) Heinemann, T., (0000-0002-5827-0041) Hidding, B., (0000-0003-0746-0731) Karsch, S., (0000-0001-9759-1166) Köhler, A., (0000-0003-1757-0985) Kononenko, O., Nutter, A., (0000-0001-8965-1149) Steiniger, K., Ufer, P., (0000-0001-8158-0980) Martinez De La Ossa, A., (0000-0003-0390-7671) Schramm, U., (0000-0002-4626-0049) Irman, A., (0000-0002-2769-4749) Schöbel, S., (0000-0001-7990-9564) Pausch, R., Chang, Y.-Y., (0000-0002-5015-0387) Corde, S., (0000-0001-9129-4208) Couperus Cabadağ, J. P., (0000-0002-3844-3697) Debus, A., (0000-0003-4713-0331) Ding, H., (0000-0003-2913-5729) Döpp, A., (0000-0002-5886-0834) Förster, M., Gilljohann, M., Haberstroh, F., (0000-0001-7747-1650) Heinemann, T., (0000-0002-5827-0041) Hidding, B., (0000-0003-0746-0731) Karsch, S., (0000-0001-9759-1166) Köhler, A., (0000-0003-1757-0985) Kononenko, O., Nutter, A., (0000-0001-8965-1149) Steiniger, K., Ufer, P., (0000-0001-8158-0980) Martinez De La Ossa, A., (0000-0003-0390-7671) Schramm, U., and (0000-0002-4626-0049) Irman, A.
Abstract: High peak current electron beams from laser wakefield accelerators (LWFA) are capable to drive a particle driven wakefield (PWFA) in a subsequent stage. The intrinsic short duration of these driver beams opens the possibility for PWFA studies in a higher density regime of the order of 1018·cm-3. Since optical probing provides a reasonable contrast at this density range, direct insight into the particle-driven wakefields is possible. Here we present the results of femtosecond optical probing of such beam driven wakefields, showing pronounced differences in the morphology of beam driven plasma waves when surrounded by either neutral gas or a broad pre-generated plasma channel. Moreover, the shape and size of the first cavity of the wakefields correlates with the driver beam charge. The experimental results are supported by 3D particle-in-cell simulations performed with PIConGPU. This method can be extended to a detailed study of driver charge depletion by probing the evolution of the wakefield as it propagates through the plasma. This is an important step for further understanding and optimization of high energy efficiency PWFAs.
Published: 2022

23. Experimental results of Trojan horse injection in a hybrid LPWFA

Author: (0000-0002-6463-5406) Ufer, P., Nutter, A., Chang, Y.-Y., (0000-0002-5015-0387) Corde, S., (0000-0001-9129-4208) Couperus Cabadağ, J. P., (0000-0002-3844-3697) Debus, A., (0000-0003-2913-5729) Döpp, A., (0000-0001-7747-1650) Heinemann, T., (0000-0002-5827-0041) Hidding, B., Gilljohann, M., (0000-0003-0746-0731) Karsch, S., (0000-0001-9759-1166) Köhler, A., (0000-0003-1757-0985) Kononenko, O., (0000-0001-7990-9564) Pausch, R., (0000-0002-2769-4749) Schöbel, S., (0000-0001-8158-0980) Martinez De La Ossa, A., (0000-0003-0390-7671) Schramm, U., (0000-0002-4626-0049) Irman, A., (0000-0002-6463-5406) Ufer, P., Nutter, A., Chang, Y.-Y., (0000-0002-5015-0387) Corde, S., (0000-0001-9129-4208) Couperus Cabadağ, J. P., (0000-0002-3844-3697) Debus, A., (0000-0003-2913-5729) Döpp, A., (0000-0001-7747-1650) Heinemann, T., (0000-0002-5827-0041) Hidding, B., Gilljohann, M., (0000-0003-0746-0731) Karsch, S., (0000-0001-9759-1166) Köhler, A., (0000-0003-1757-0985) Kononenko, O., (0000-0001-7990-9564) Pausch, R., (0000-0002-2769-4749) Schöbel, S., (0000-0001-8158-0980) Martinez De La Ossa, A., (0000-0003-0390-7671) Schramm, U., and (0000-0002-4626-0049) Irman, A.
Abstract: A hybrid (LPWFA) plasma accelerator combines the two schemes of plasma acceleration, using a laser (LWFA) and an electron beam (PWFA) to drive the plasma wave, with the goal to combine the advantages of both methods. This concept allows studies of PWFA-physics in compact setups as well as generating high-quality electron beams to fulfill the demands of secondary light sources like FELs. We present experimental results from hybrid plasma accelerators using plasma cathode injection also known as Trojan horse injection. A short-pulsed laser is used as the injector in the second stage of the accelerator propagating perpendicular to the electron beam. When timed such, that injector laser and the first cavity of the wakefield overlap, the creation of low-energy-spread witness beams have been observed.
Published: 2022

24. Seeded FEL lasing of the COXINEL beamline driven by the HZDR plasma accelerator

Author: Labat, M., (0000-0001-9129-4208) Couperus Cabadağ, J. P., Ghaith, A., (0000-0002-4626-0049) Irman, A., Berlioux, A., Berteaud, P., Blache, F., (0000-0002-1919-8585) Bock, S., Bouvet, F., Briquez, F., Chang, Y.-Y., Corde, S., (0000-0002-3844-3697) Debus, A., Oliveira, C., Duval, J.-P., Dietrich, Y., El Ajjouri, M., Eisenmann, C., Gautier, J., Gebhardt, R., Grams, S., Helbig, U., Herbeaux, C., Hubert, N., Kitegi, C., Kononenko, O., (0000-0002-8145-5837) Kuntzsch, M., La Berge, M., Le, S., Leluan, B., Loulergue, A., Malka, V., Marteau, F., Huy N. Guyen, M., Oumbarek-Espinos, D., (0000-0001-7990-9564) Pausch, R., Pereira, D., (0000-0002-4738-6436) Püschel, T., Ricaud, J.-P., Rommeluere, P., Roussel, E., Rousseau, P., (0000-0002-2769-4749) Schöbel, S., Sebdaoui, M., (0000-0001-8965-1149) Steiniger, K., Tavakoli, K., Thaury, C., (0000-0002-6463-5406) Ufer, P., Valleau, M., Vandenberghe, M., Veteran, J., (0000-0003-0390-7671) Schramm, U., Couprie, M.-E., Labat, M., (0000-0001-9129-4208) Couperus Cabadağ, J. P., Ghaith, A., (0000-0002-4626-0049) Irman, A., Berlioux, A., Berteaud, P., Blache, F., (0000-0002-1919-8585) Bock, S., Bouvet, F., Briquez, F., Chang, Y.-Y., Corde, S., (0000-0002-3844-3697) Debus, A., Oliveira, C., Duval, J.-P., Dietrich, Y., El Ajjouri, M., Eisenmann, C., Gautier, J., Gebhardt, R., Grams, S., Helbig, U., Herbeaux, C., Hubert, N., Kitegi, C., Kononenko, O., (0000-0002-8145-5837) Kuntzsch, M., La Berge, M., Le, S., Leluan, B., Loulergue, A., Malka, V., Marteau, F., Huy N. Guyen, M., Oumbarek-Espinos, D., (0000-0001-7990-9564) Pausch, R., Pereira, D., (0000-0002-4738-6436) Püschel, T., Ricaud, J.-P., Rommeluere, P., Roussel, E., Rousseau, P., (0000-0002-2769-4749) Schöbel, S., Sebdaoui, M., (0000-0001-8965-1149) Steiniger, K., Tavakoli, K., Thaury, C., (0000-0002-6463-5406) Ufer, P., Valleau, M., Vandenberghe, M., Veteran, J., (0000-0003-0390-7671) Schramm, U., and Couprie, M.-E.
Abstract: Laser Plasma Accelerators (LPAs), harnessing gigavolt-per-centimeter accelerating fields, can generate high peak current, low emittance and GeV class electron beams paving the way for the realization of future compact free-electron lasers (FELs). Here, we report on the commissioning of the COXINEL beamline driven by the HZDR plasma accelerator and experimental demonstration of FEL lasing at 270 nm in a seeded configuration. Control over the radiation wavelength is achieved with an improved bandwidth stability. Furthermore, the appearance of interference fringes, resulting from the interaction between the phase-locked emitted radiation and the seed, confirms longitudinal coherence, representing a key feature of such a seeded FEL. These results are cross-checked with simulations, ELEGANT for beam optics and GENESIS for FEL radiation. We anticipate a navigable pathway toward smaller-scale free-electron lasers at extreme ultra-violet wavelengths.
Published: 2022

25. Generating synthetic shadowgrams with an in-situ plugin in PIConGPU

Author: Carstens, F.-O., (0000-0001-8965-1149) Steiniger, K., (0000-0001-7990-9564) Pausch, R., (0000-0002-2769-4749) Schöbel, S., Chang, Y.-Y., (0000-0002-4626-0049) Irman, A., (0000-0003-0390-7671) Schramm, U., (0000-0002-3844-3697) Debus, A., Carstens, F.-O., (0000-0001-8965-1149) Steiniger, K., (0000-0001-7990-9564) Pausch, R., (0000-0002-2769-4749) Schöbel, S., Chang, Y.-Y., (0000-0002-4626-0049) Irman, A., (0000-0003-0390-7671) Schramm, U., and (0000-0002-3844-3697) Debus, A.
Abstract: Few-cycle shadowgraphy is a valuable diagnostic for laser-plasma accelerators for obtaining insight into the $\mu$m- and fs-scale relativistic plasma dynamics. To enhance the understanding of experimental shadowgrams, we developed a synthetic shadowgram diagnostic within the fully relativistic particle-in-cell code PIConGPU. In the shadowgraphy diagnostic, the probe laser is propagated through the plasma using PIConGPU, and then extracted and propagated onto a virtual CCD using an in-situ plugin for PIConGPU based on Fourier optics. The in-situ approach circumvents performance limitations of a post-processing workflow, like storing and loading large output files that result from large-scale laser-plasma simulations. This poster presents the in-situ plugin and first synthetic shadowgrams from laser wakefield accelerator simulations that are generated by the plugin.
Published: 2022

26. Excitation of beam driven plasma waves in a hybrid LPWFA

Author: (0000-0002-2769-4749) Schöbel, S., (0000-0001-7990-9564) Pausch, R., Carstens, F.-O., Chang, Y.-Y., (0000-0002-5015-0387) Corde, S., (0000-0001-9129-4208) Couperus Cabadağ, J. P., (0000-0002-3844-3697) Debus, A., (0000-0003-4713-0331) Ding, H., (0000-0003-2913-5729) Döpp, A., (0000-0001-7747-1650) Heinemann, T., (0000-0002-5827-0041) Hidding, B., Gilljohann, M., (0000-0003-0746-0731) Karsch, S., (0000-0001-9759-1166) Köhler, A., (0000-0003-1757-0985) Kononenko, O., Nutter, A., Ufer, P., (0000-0001-8158-0980) Martinez De La Ossa, A., (0000-0003-0390-7671) Schramm, U., (0000-0002-4626-0049) Irman, A., (0000-0002-2769-4749) Schöbel, S., (0000-0001-7990-9564) Pausch, R., Carstens, F.-O., Chang, Y.-Y., (0000-0002-5015-0387) Corde, S., (0000-0001-9129-4208) Couperus Cabadağ, J. P., (0000-0002-3844-3697) Debus, A., (0000-0003-4713-0331) Ding, H., (0000-0003-2913-5729) Döpp, A., (0000-0001-7747-1650) Heinemann, T., (0000-0002-5827-0041) Hidding, B., Gilljohann, M., (0000-0003-0746-0731) Karsch, S., (0000-0001-9759-1166) Köhler, A., (0000-0003-1757-0985) Kononenko, O., Nutter, A., Ufer, P., (0000-0001-8158-0980) Martinez De La Ossa, A., (0000-0003-0390-7671) Schramm, U., and (0000-0002-4626-0049) Irman, A.
Abstract: High peak current electron beams from laser wakefield accelerators (LWFA) are capable to drive a particle driven wakefield (PWFA) in a subsequent stage. The intrinsic short duration of these driver beams opens the possibility for PWFA studies in a higher density regime of the order of 1018·cm-3. Since optical probing provides a reasonable contrast at this density range, direct insight into the particle-driven wakefields is possible. Here we present the results of femtosecond optical probing of such beam driven wakefields, showing pronounced differences in the morphology of beam driven plasma waves when surrounded by either neutral gas or a broad pre-generated plasma channel. Moreover, the shape and size of the first cavity of the wakefields correlates with the driver beam charge. The experimental results are supported by 3D particle-in-cell simulations performed with PIConGPU. This method can be extended to a detailed study of driver charge depletion by probing the evolution of the wakefield as it propagates through the plasma. This is an important step for further understanding and optimization of high energy efficiency PWFAs.
Published: 2022

27. Ultrafast melting of Warm Dense Cu studied by x-ray spectroscopy

Author: (0000-0002-7162-7500) Smid, M., (0000-0001-9759-1166) Köhler, A., Bowers, B., Chang, Y.-Y., (0000-0001-9129-4208) Couperus Cabadağ, J. P., (0000-0003-1184-2097) Huang, L., Kozlová, M., Kurz, T., La Berge, M., Pan, X., (0000-0002-2767-9995) Perez-Martin, P., Ruiz De Los Panos, I. L., (0000-0002-2769-4749) Schöbel, S., (0000-0001-5926-9192) Vorberger, J., (0000-0003-4362-3438) Zarini, O., (0000-0002-5845-000X) Cowan, T., (0000-0003-0390-7671) Schramm, U., (0000-0002-4626-0049) Irman, A., (0000-0001-5975-776X) Falk, K., (0000-0002-7162-7500) Smid, M., (0000-0001-9759-1166) Köhler, A., Bowers, B., Chang, Y.-Y., (0000-0001-9129-4208) Couperus Cabadağ, J. P., (0000-0003-1184-2097) Huang, L., Kozlová, M., Kurz, T., La Berge, M., Pan, X., (0000-0002-2767-9995) Perez-Martin, P., Ruiz De Los Panos, I. L., (0000-0002-2769-4749) Schöbel, S., (0000-0001-5926-9192) Vorberger, J., (0000-0003-4362-3438) Zarini, O., (0000-0002-5845-000X) Cowan, T., (0000-0003-0390-7671) Schramm, U., (0000-0002-4626-0049) Irman, A., and (0000-0001-5975-776X) Falk, K.
Abstract: We present novel experimental results of ultra fast heating of Warm Dense Cu diagnosed by means of x-ray absorption and emission spectroscopy carried out at the Draco laser facility at HZDR in 2021. A thin Cu foil was directly heated to few eV temperature by an ultra short laser pulse (40 fs, 2e15 W/cm2) and probed with variable delay in the range 0.2-20 ps by a laser-driven betatron radiation. This betatron radiation, created by a laser wakefield accelerator, is an unique x-ray source with its ultra short duration and broadband spectrum, therefore ideally suited for studies of non-equilibrium dense plasmas while its high brightness allows for single-shot measurement. The sample is studied via the X-ray absorption spectroscopy in the region above the Cu K-edge. This method provides temporally-resolved information about both the ionic structure of the matter and its temperature during the process of ultrafast heating and melting of the material. The measured spectra are understood and analyzed by using Ab initio simulations and the temporal evoution of heatig and melting is compared to PIC simulations to infer the electron to ion energy transer.
Published: 2022

28. Ultrafast melting of Warm Dense Cu studied by x-ray spectroscopy

Author: (0000-0002-7162-7500) Smid, M., (0000-0001-9759-1166) Köhler, A., Bowers, B., (0000-0003-0548-3999) Chang, Y.-Y., (0000-0001-9129-4208) Couperus Cabadağ, J. P., (0000-0003-1184-2097) Huang, L., (0000-0003-4757-9972) Kozlová, M., Kurz, T., (0000-0003-3089-4087) La Berge, M., (0000-0002-3882-510X) Pan, X., (0000-0002-2767-9995) Perez-Martin, P., Ruiz De Los Panos, I. L., (0000-0002-2769-4749) Schöbel, S., (0000-0001-5926-9192) Vorberger, J., (0000-0003-4362-3438) Zarini, O., (0000-0002-5845-000X) Cowan, T., (0000-0003-0390-7671) Schramm, U., (0000-0002-4626-0049) Irman, A., (0000-0001-5975-776X) Falk, K., (0000-0002-7162-7500) Smid, M., (0000-0001-9759-1166) Köhler, A., Bowers, B., (0000-0003-0548-3999) Chang, Y.-Y., (0000-0001-9129-4208) Couperus Cabadağ, J. P., (0000-0003-1184-2097) Huang, L., (0000-0003-4757-9972) Kozlová, M., Kurz, T., (0000-0003-3089-4087) La Berge, M., (0000-0002-3882-510X) Pan, X., (0000-0002-2767-9995) Perez-Martin, P., Ruiz De Los Panos, I. L., (0000-0002-2769-4749) Schöbel, S., (0000-0001-5926-9192) Vorberger, J., (0000-0003-4362-3438) Zarini, O., (0000-0002-5845-000X) Cowan, T., (0000-0003-0390-7671) Schramm, U., (0000-0002-4626-0049) Irman, A., and (0000-0001-5975-776X) Falk, K.
Abstract: We present novel experimental results of ultra fast heating of Warm Dense Cu diagnosed by means of x-ray absorption and emission spectroscopy carried out at the Draco laser facility at HZDR in 2021. A thin Cu foil was directly heated to few eV temperature by an ultra short laser pulse (40 fs, 2e15 W/cm2) and probed with variable delay in the range 0.2-20 ps by a laser-driven betatron radiation. This betatron radiation, created by a laser wakefield accelerator, is an unique x-ray source with its ultra short duration and broadband spectrum, therefore ideally suited for studies of non-equilibrium dense plasmas while its high brightness allows for single-shot measurement. The sample is studied via the X-ray absorption spectroscopy in the region above the Cu K-edge. This method provides temporally-resolved information about both the ionic structure of the matter and its temperature during the process of ultrafast heating and melting of the material. The measured spectra are understood and analyzed by using Ab initio simulations and the temporal evoution of heatig and melting is compared to PIC simulations to infer the electron to ion energy transer.
Published: 2022

29. Stable and High-Quality Electron Beams from Staged Laser and Plasma Wakefield Accelerators

Author: Foerster, F. M., Döpp, A., Haberstroh, F., Grafenstein, K. V., Campbell, D., (0000-0003-0548-3999) Chang, Y.-Y., Corde, S., (0000-0001-9129-4208) Couperus Cabadağ, J. P., (0000-0002-3844-3697) Debus, A., Gilljohann, M. F., Habib, A. F., Heinemann, T., Hidding, B., (0000-0002-4626-0049) Irman, A., Irshad, F., Knetsch, A., Kononenko, O., Martinez De La Ossa, A., Nutter, A., (0000-0001-7990-9564) Pausch, R., Schilling, G., Schletter, A., (0000-0002-2769-4749) Schöbel, S., (0000-0003-0390-7671) Schramm, U., Travac, E., (0000-0002-6463-5406) Ufer, P., Karsch, S., Foerster, F. M., Döpp, A., Haberstroh, F., Grafenstein, K. V., Campbell, D., (0000-0003-0548-3999) Chang, Y.-Y., Corde, S., (0000-0001-9129-4208) Couperus Cabadağ, J. P., (0000-0002-3844-3697) Debus, A., Gilljohann, M. F., Habib, A. F., Heinemann, T., Hidding, B., (0000-0002-4626-0049) Irman, A., Irshad, F., Knetsch, A., Kononenko, O., Martinez De La Ossa, A., Nutter, A., (0000-0001-7990-9564) Pausch, R., Schilling, G., Schletter, A., (0000-0002-2769-4749) Schöbel, S., (0000-0003-0390-7671) Schramm, U., Travac, E., (0000-0002-6463-5406) Ufer, P., and Karsch, S.
Abstract: We present experimental results on a plasma wakefield accelerator (PWFA) driven by high-current electron beams from a laser wakefield accelerator (LWFA). In this staged setup stable and high-quality (low-divergence and low energy spread) electron beams are generated at an optically generated hydro- dynamic shock in the PWFA. The energy stability of the beams produced by that arrangement in the PWFA stage is comparable to both single-stage laser accelerators and plasma wakefield accelerators driven by conventional accelerators. Simulations support that the intrinsic insensitivity of PWFAs to driver energy fluctuations can be exploited to overcome stability limitations of state-of-the-art laser wakefield accelerators when adding a PWFA stage. Furthermore, we demonstrate the generation of electron bunches with energy spread and divergence superior to single-stage LWFAs, resulting in bunches with dense phase space and an angular-spectral charge density beyond the initial drive beam parameters. These results unambiguously show that staged LWFA-PWFA can help to tailor the electron-beam quality for certain applications and to reduce the influence of fluctuating laser drivers on the electron-beam stability. This encourages further development of this new class of staged wakefield acceleration as a viable scheme toward compact, high-quality electron beam sources.
Published: 2022

30. Multi-octave high-dynamic range optical spectrometer for single-pulse, longitudinal characterization of ultrashort electron bunches

Author: (0000-0003-4362-3438) Zarini, O., (0000-0001-9129-4208) Couperus Cabadağ, J. P., (0000-0003-0548-3999) Chang, Y.-Y., (0000-0001-9759-1166) Köhler, A., (0000-0003-0340-9963) Kurz, T., (0000-0002-2769-4749) Schöbel, S., Seidel, W., (0000-0002-8258-3881) Bussmann, M., (0000-0003-0390-7671) Schramm, U., (0000-0002-4626-0049) Irman, A., (0000-0002-3844-3697) Debus, A., (0000-0003-4362-3438) Zarini, O., (0000-0001-9129-4208) Couperus Cabadağ, J. P., (0000-0003-0548-3999) Chang, Y.-Y., (0000-0001-9759-1166) Köhler, A., (0000-0003-0340-9963) Kurz, T., (0000-0002-2769-4749) Schöbel, S., Seidel, W., (0000-0002-8258-3881) Bussmann, M., (0000-0003-0390-7671) Schramm, U., (0000-0002-4626-0049) Irman, A., and (0000-0002-3844-3697) Debus, A.
Abstract: We present design and realization of an ultra-broadband optical spectrometer capable of measuring the spectral intensity of multi-octave-spanning light sources on a single-pulse basis with a dynamic range of up to 8 orders of magnitude. The instrument is optimized for the characterization of the temporal structure of femtosecond long electron bunches by analyzing the emitted coherent transition radiation (CTR) spectra. The spectrometer operates within the spectral range of 250nm to 11.35µm, corresponding to 5.5 optical octaves. This is achieved by dividing the signal beam into three spectral groups, each analyzed by a dedicated spectrometer and detector unit. The complete instrument was characterized with regard to wavelength, relative spectral sensitivity, and absolute photo-metric sensitivity, always accounting for the light polarization and comparing different calibration methods. Finally, the capability of the spectrometer is demonstrated with a CTR measurement of a laser wakefield accelerated electron bunch, enabling to determine temporal pulse structures at unprecedented resolution.
Published: 2022

31. Effect of driver charge on wakefield characteristics in a plasma accelerator probed by femtosecond shadowgraphy

Author: (0000-0002-2769-4749) Schöbel, S., (0000-0001-7990-9564) Pausch, R., (0000-0003-0548-3999) Chang, Y.-Y., (0000-0002-5015-0387) Corde, S., (0000-0001-9129-4208) Couperus Cabadağ, J. P., (0000-0002-3844-3697) Debus, A., (0000-0003-4713-0331) Ding, H., (0000-0003-2913-5729) Döpp, A., (0000-0002-5886-0834) Moritz Foerster, F., Gilljohann, M., Haberstroh, F., (0000-0001-7747-1650) Heinemann, T., (0000-0002-5827-0041) Hidding, B., (0000-0003-0746-0731) Karsch, S., (0000-0001-9759-1166) Köhler, A., (0000-0003-1757-0985) Kononenko, O., (0000-0003-0340-9963) Kurz, T., Nutter, A., (0000-0001-8965-1149) Steiniger, K., (0000-0002-6463-5406) Ufer, P., (0000-0001-8158-0980) Martinez De La Ossa, A., (0000-0003-0390-7671) Schramm, U., (0000-0002-4626-0049) Irman, A., (0000-0002-2769-4749) Schöbel, S., (0000-0001-7990-9564) Pausch, R., (0000-0003-0548-3999) Chang, Y.-Y., (0000-0002-5015-0387) Corde, S., (0000-0001-9129-4208) Couperus Cabadağ, J. P., (0000-0002-3844-3697) Debus, A., (0000-0003-4713-0331) Ding, H., (0000-0003-2913-5729) Döpp, A., (0000-0002-5886-0834) Moritz Foerster, F., Gilljohann, M., Haberstroh, F., (0000-0001-7747-1650) Heinemann, T., (0000-0002-5827-0041) Hidding, B., (0000-0003-0746-0731) Karsch, S., (0000-0001-9759-1166) Köhler, A., (0000-0003-1757-0985) Kononenko, O., (0000-0003-0340-9963) Kurz, T., Nutter, A., (0000-0001-8965-1149) Steiniger, K., (0000-0002-6463-5406) Ufer, P., (0000-0001-8158-0980) Martinez De La Ossa, A., (0000-0003-0390-7671) Schramm, U., and (0000-0002-4626-0049) Irman, A.
Abstract: We report on experimental investigations of plasma wave structures in a plasma wakefield acceleration (PWFA) stage which is driven by electron beams from a preceding laser plasma accelerator. Femtosecond optical probing is utilized to allow for direct visualization of the plasma dynamics inside the target. We compare two regimes in which the driver propagates either through an initially neutral gas, or a preformed plasma. In the first case, plasma waves are observed that quickly damp after a few oscillations and are located within a narrow plasma channel ionized by the driver, having about the same transverse size as the plasma wakefield cavities. In contrast, for the latter robust cavities are recorded sustained over many periods. Furthermore, here an elongation of the first cavity is measured, which becomes stronger with increasing driver beam charge. Since the cavity length is linked to the maximum accelerating field strength, this elongation implies an increased field strength. This observation is supported by 3D particle-in-cell simulations performed with PIConGPU. This work can be extended for the investigation of driver depletion by probing at different propagation distances inside the plasma, which is essential for the development of high energy efficiency PWFAs.
Published: 2022

32. Beam driven wakefield characteristics probed by femtosecond-scale shadowgraphy

Author: (0000-0002-2769-4749) Schöbel, S., (0000-0001-7990-9564) Pausch, R., (0000-0003-0548-3999) Chang, Y.-Y., (0000-0002-5015-0387) Corde, S., (0000-0001-9129-4208) Couperus Cabadağ, J. P., (0000-0002-3844-3697) Debus, A., (0000-0003-4713-0331) Ding, H., (0000-0003-2913-5729) Döpp, A., (0000-0002-5886-0834) Förster, M., Gilljohann, M., Haberstroh, F., (0000-0001-7747-1650) Heinemann, T., (0000-0002-5827-0041) Hidding, B., (0000-0003-0746-0731) Karsch, S., (0000-0001-9759-1166) Köhler, A., (0000-0003-1757-0985) Kononenko, O., Nutter, A., (0000-0001-8965-1149) Steiniger, K., (0000-0002-6463-5406) Ufer, P., (0000-0001-8158-0980) Martinez De La Ossa, A., (0000-0003-0390-7671) Schramm, U., (0000-0002-4626-0049) Irman, A., (0000-0002-2769-4749) Schöbel, S., (0000-0001-7990-9564) Pausch, R., (0000-0003-0548-3999) Chang, Y.-Y., (0000-0002-5015-0387) Corde, S., (0000-0001-9129-4208) Couperus Cabadağ, J. P., (0000-0002-3844-3697) Debus, A., (0000-0003-4713-0331) Ding, H., (0000-0003-2913-5729) Döpp, A., (0000-0002-5886-0834) Förster, M., Gilljohann, M., Haberstroh, F., (0000-0001-7747-1650) Heinemann, T., (0000-0002-5827-0041) Hidding, B., (0000-0003-0746-0731) Karsch, S., (0000-0001-9759-1166) Köhler, A., (0000-0003-1757-0985) Kononenko, O., Nutter, A., (0000-0001-8965-1149) Steiniger, K., (0000-0002-6463-5406) Ufer, P., (0000-0001-8158-0980) Martinez De La Ossa, A., (0000-0003-0390-7671) Schramm, U., and (0000-0002-4626-0049) Irman, A.
Abstract: High peak current electron beams from laser wakefield accelerators (LWFA) are capable to drive a particle driven wakefield (PWFA) in a subsequent stage. The intrinsic short duration of these driver beams opens the possibility for PWFA studies in a higher density regime of the order of 1018·cm-3. Since optical probing provides a reasonable contrast at this density range, direct insight into the particle-driven wakefields is possible. Here we present the results of femtosecond optical probing of such beam driven wakefields, showing pronounced differences in the morphology of beam driven plasma waves when surrounded by either neutral gas or a broad pre-generated plasma channel. Moreover, the shape and size of the first cavity of the wakefields correlates with the driver beam charge. The experimental results are supported by 3D particle-in-cell simulations performed with PIConGPU. This method can be extended to a detailed study of driver charge depletion by probing the evolution of the wakefield as it propagates through the plasma. This is an important step for further understanding and optimization of high energy efficiency PWFAs.
Published: 2022

33. Stable Multi-Day Performance of a Laser Wakefield Accelerator for FEL Applications

Author: (0000-0001-9129-4208) Couperus Cabadağ, J. P., (0000-0002-1919-8585) Bock, S., (0000-0003-0548-3999) Chang, Y.-Y., (0000-0002-3844-3697) Debus, A., Gebhardt, R., (0000-0003-1064-489X) Ghaith, A., Helbig, U., (0000-0002-4626-0049) Irman, A., (0000-0001-9759-1166) Köhler, A., (0000-0003-3089-4087) Laberge, M., (0000-0001-7990-9564) Pausch, R., (0000-0002-4738-6436) Püschel, T., (0000-0003-0390-7671) Schramm, U., (0000-0002-2769-4749) Schöbel, S., (0000-0001-8965-1149) Steiniger, K., (0000-0002-6463-5406) Ufer, P., (0000-0003-4362-3438) Zarini, O., Roussel, E., Couprie, M.- . E., Labat, M., Downer, M. C., (0000-0001-9129-4208) Couperus Cabadağ, J. P., (0000-0002-1919-8585) Bock, S., (0000-0003-0548-3999) Chang, Y.-Y., (0000-0002-3844-3697) Debus, A., Gebhardt, R., (0000-0003-1064-489X) Ghaith, A., Helbig, U., (0000-0002-4626-0049) Irman, A., (0000-0001-9759-1166) Köhler, A., (0000-0003-3089-4087) Laberge, M., (0000-0001-7990-9564) Pausch, R., (0000-0002-4738-6436) Püschel, T., (0000-0003-0390-7671) Schramm, U., (0000-0002-2769-4749) Schöbel, S., (0000-0001-8965-1149) Steiniger, K., (0000-0002-6463-5406) Ufer, P., (0000-0003-4362-3438) Zarini, O., Roussel, E., Couprie, M.- . E., Labat, M., and Downer, M. C.
Abstract: We report on the operation of the DRACO Laser Driven electron source for stable multi-day operation for Free Electron Laser (FEL) applications. The nC-class accelerator can deliver charge densities around 10 pC/MeV , <1 mrad rms divergence at energies up to 0.5 GeV and peak currents of over 10 kA*. Precise characterisation is paramount for controlled operation, including: spectrally resolved charge diagnostic, coherent optical transition radiation (TR) to resolve microbunch beam structures** and TR-based multioctave high-dynamic range spectrometry for sub-fs resolved characterisation of the 10 fs rms electron bunches***. Achieved stability allows for systematic exploration of demanding applications, resulting in the recent demonstration of the first LWFA based Beam-driven Plasma Wakefield Accelerator (LPWFA)****. Fulfilling the high demands required for FEL operation, the COXINEL manipulation line***** developed at Synchotron SOLEIL has recently been installed at our facility. Based on successful beam transport of over 13000 shots within 9 experimental days during commissioning, we were able to demonstrate the very first operation of a seeded FEL driven by a laser plasma accelerator******. * J.P. Couperus et al., Nat. Comm. 8 (2017) ** O. Zarini et al., PRAB (2022) *** A. Lumpkin et al., Phys. Rev. Lett., 125, 014801 (2020) **** T. Kurz, T. Heinemann et al., Nature Commun., 12, 2895 (2021) ***** M.-E. Couprie et al., J. Phys B, 47, 234001 (2014) & M.-E. Couprie et al., PPCF, 58, 034020 (2016) ****** M. Labat et al., in review, (2022), doi:10.21203/rs.3.rs-1692828/v1
Published: 2022

34. Demonstration of Trojan horse injection in a hybrid LWFA-driven PWFA

Author: (0000-0002-6463-5406) Ufer, P., Nutter, A., (0000-0003-0548-3999) Chang, Y.-Y., (0000-0002-5015-0387) Corde, S., (0000-0001-9129-4208) Couperus Cabadağ, J. P., (0000-0002-3844-3697) Debus, A., (0000-0003-2913-5729) Döpp, A., (0000-0002-5886-0834) Moritz Foerster, F., Gilljohann, M., (0000-0001-7747-1650) Heinemann, T., (0000-0002-5827-0041) Hidding, B., (0000-0003-0746-0731) Karsch, S., (0000-0001-9759-1166) Köhler, A., (0000-0003-1757-0985) Kononenko, O., (0000-0001-7990-9564) Pausch, R., (0000-0002-2769-4749) Schöbel, S., (0000-0001-8158-0980) Martinez De La Ossa, A., (0000-0003-0390-7671) Schramm, U., (0000-0002-4626-0049) Irman, A., (0000-0002-6463-5406) Ufer, P., Nutter, A., (0000-0003-0548-3999) Chang, Y.-Y., (0000-0002-5015-0387) Corde, S., (0000-0001-9129-4208) Couperus Cabadağ, J. P., (0000-0002-3844-3697) Debus, A., (0000-0003-2913-5729) Döpp, A., (0000-0002-5886-0834) Moritz Foerster, F., Gilljohann, M., (0000-0001-7747-1650) Heinemann, T., (0000-0002-5827-0041) Hidding, B., (0000-0003-0746-0731) Karsch, S., (0000-0001-9759-1166) Köhler, A., (0000-0003-1757-0985) Kononenko, O., (0000-0001-7990-9564) Pausch, R., (0000-0002-2769-4749) Schöbel, S., (0000-0001-8158-0980) Martinez De La Ossa, A., (0000-0003-0390-7671) Schramm, U., and (0000-0002-4626-0049) Irman, A.
Abstract: In a hybrid LWFA-driven PWFA (LPWFA) electron beams from a laser wakefield acceleration (LWFA) stage are utilized to drive a plasma wave in a subsequent plasma wakefield acceleration (PWFA) stage for acceleration of witness electron bunches to high energies. This concept allows for the exploration of PWFA-physics in a compact setup and harnessing the advantages of both plasma acceleration schemes in order to generate high-quality electron beams. Here we present results of Trojan horse injection in this hybrid plasma acceleration configuration. The DRACO laser is focused onto a gas target (LWFA stage), creating a plasma wakefield to accelerate a high peak current electron bunch. While such a beam is propagating in the second gas jet (PWFA stage), consisting of a mixture of high and low ionization threshold gas, an auxiliary low energy laser pulse intercepts the generated wakefield perpendicularly to release electrons from the highest ionization level in the first cavity. The generated witness beams show improved beam quality, such as lower energy spread compared to the drive electron beam. The realization of Trojan horse injection in LPWFA is a further step towards applications based on high brightness electron beams such as free electron lasers.
Published: 2022

35. Beam driven wakefield characteristics probed by femtosecond-scale shadowgraphy

Author: (0000-0002-2769-4749) Schöbel, S., (0000-0001-7990-9564) Pausch, R., (0000-0003-0548-3999) Chang, Y.-Y., (0000-0002-5015-0387) Corde, S., (0000-0001-9129-4208) Couperus Cabadağ, J. P., (0000-0002-3844-3697) Debus, A., (0000-0003-4713-0331) Ding, H., (0000-0003-2913-5729) Döpp, A., (0000-0002-5886-0834) Förster, M., Gilljohann, M., Haberstroh, F., (0000-0001-7747-1650) Heinemann, T., (0000-0002-5827-0041) Hidding, B., (0000-0003-0746-0731) Karsch, S., (0000-0001-9759-1166) Köhler, A., (0000-0003-1757-0985) Kononenko, O., Nutter, A., (0000-0001-8965-1149) Steiniger, K., (0000-0002-6463-5406) Ufer, P., (0000-0001-8158-0980) Martinez De La Ossa, A., (0000-0003-0390-7671) Schramm, U., (0000-0002-4626-0049) Irman, A., (0000-0002-2769-4749) Schöbel, S., (0000-0001-7990-9564) Pausch, R., (0000-0003-0548-3999) Chang, Y.-Y., (0000-0002-5015-0387) Corde, S., (0000-0001-9129-4208) Couperus Cabadağ, J. P., (0000-0002-3844-3697) Debus, A., (0000-0003-4713-0331) Ding, H., (0000-0003-2913-5729) Döpp, A., (0000-0002-5886-0834) Förster, M., Gilljohann, M., Haberstroh, F., (0000-0001-7747-1650) Heinemann, T., (0000-0002-5827-0041) Hidding, B., (0000-0003-0746-0731) Karsch, S., (0000-0001-9759-1166) Köhler, A., (0000-0003-1757-0985) Kononenko, O., Nutter, A., (0000-0001-8965-1149) Steiniger, K., (0000-0002-6463-5406) Ufer, P., (0000-0001-8158-0980) Martinez De La Ossa, A., (0000-0003-0390-7671) Schramm, U., and (0000-0002-4626-0049) Irman, A.
Abstract: High peak current electron beams from laser wakefield accelerators (LWFA) are capable to drive a particle driven wakefield (PWFA) in a subsequent stage. The intrinsic short duration of these driver beams opens the possibility for PWFA studies in a higher density regime of the order of 1018·cm-3. Since optical probing provides a reasonable contrast at this density range, direct insight into the particle-driven wakefields is possible. Here we present the results of femtosecond optical probing of such beam driven wakefields, showing pronounced differences in the morphology of beam driven plasma waves when surrounded by either neutral gas or a broad pre-generated plasma channel. Moreover, the shape and size of the first cavity of the wakefields correlates with the driver beam charge. The experimental results are supported by 3D particle-in-cell simulations performed with PIConGPU. This method can be extended to a detailed study of driver charge depletion by probing the evolution of the wakefield as it propagates through the plasma. This is an important step for further understanding and optimization of high energy efficiency PWFAs.
Published: 2022

36. Generating synthetic shadowgrams with an in-situ plugin in PIConGPU

Author: (0009-0008-0365-5164) Carstens, F.-O., (0000-0001-8965-1149) Steiniger, K., (0000-0001-7990-9564) Pausch, R., (0000-0002-2769-4749) Schöbel, S., (0000-0003-0548-3999) Chang, Y.-Y., (0000-0002-4626-0049) Irman, A., (0000-0003-0390-7671) Schramm, U., (0000-0002-3844-3697) Debus, A., (0009-0008-0365-5164) Carstens, F.-O., (0000-0001-8965-1149) Steiniger, K., (0000-0001-7990-9564) Pausch, R., (0000-0002-2769-4749) Schöbel, S., (0000-0003-0548-3999) Chang, Y.-Y., (0000-0002-4626-0049) Irman, A., (0000-0003-0390-7671) Schramm, U., and (0000-0002-3844-3697) Debus, A.
Abstract: Few-cycle shadowgraphy is a valuable diagnostic for laser-plasma accelerators for obtaining insight into the $\mu$m- and fs-scale relativistic plasma dynamics. To enhance the understanding of experimental shadowgrams, we developed a synthetic shadowgram diagnostic within the fully relativistic particle-in-cell code PIConGPU. In the shadowgraphy diagnostic, the probe laser is propagated through the plasma using PIConGPU, and then extracted and propagated onto a virtual CCD using an in-situ plugin for PIConGPU based on Fourier optics. The in-situ approach circumvents performance limitations of a post-processing workflow, like storing and loading large output files that result from large-scale laser-plasma simulations. This poster presents the in-situ plugin and first synthetic shadowgrams from laser wakefield accelerator simulations that are generated by the plugin.
Published: 2022

37. Beam driven wakefield characteristics probed by femtosecond-scale shadowgraphy

Author: (0000-0002-2769-4749) Schöbel, S., (0000-0001-7990-9564) Pausch, R., (0000-0003-0548-3999) Chang, Y.-Y., (0000-0002-5015-0387) Corde, S., (0000-0001-9129-4208) Couperus Cabadağ, J. P., (0000-0002-3844-3697) Debus, A., (0000-0003-4713-0331) Ding, H., (0000-0003-2913-5729) Döpp, A., (0000-0002-5886-0834) Förster, M., Gilljohann, M., Haberstroh, F., (0000-0001-7747-1650) Heinemann, T., (0000-0002-5827-0041) Hidding, B., (0000-0003-0746-0731) Karsch, S., (0000-0001-9759-1166) Köhler, A., (0000-0003-1757-0985) Kononenko, O., Nutter, A., (0000-0001-8965-1149) Steiniger, K., (0000-0002-6463-5406) Ufer, P., (0000-0001-8158-0980) Martinez De La Ossa, A., (0000-0003-0390-7671) Schramm, U., (0000-0002-4626-0049) Irman, A., (0000-0002-2769-4749) Schöbel, S., (0000-0001-7990-9564) Pausch, R., (0000-0003-0548-3999) Chang, Y.-Y., (0000-0002-5015-0387) Corde, S., (0000-0001-9129-4208) Couperus Cabadağ, J. P., (0000-0002-3844-3697) Debus, A., (0000-0003-4713-0331) Ding, H., (0000-0003-2913-5729) Döpp, A., (0000-0002-5886-0834) Förster, M., Gilljohann, M., Haberstroh, F., (0000-0001-7747-1650) Heinemann, T., (0000-0002-5827-0041) Hidding, B., (0000-0003-0746-0731) Karsch, S., (0000-0001-9759-1166) Köhler, A., (0000-0003-1757-0985) Kononenko, O., Nutter, A., (0000-0001-8965-1149) Steiniger, K., (0000-0002-6463-5406) Ufer, P., (0000-0001-8158-0980) Martinez De La Ossa, A., (0000-0003-0390-7671) Schramm, U., and (0000-0002-4626-0049) Irman, A.
Abstract: High peak current electron beams from laser wakefield accelerators (LWFA) are capable to drive a particle driven wakefield (PWFA) in a subsequent stage. The intrinsic short duration of these driver beams opens the possibility for PWFA studies in a higher density regime of the order of 1018·cm-3. Since optical probing provides a reasonable contrast at this density range, direct insight into the particle-driven wakefields is possible. Here we present the results of femtosecond optical probing of such beam driven wakefields, showing pronounced differences in the morphology of beam driven plasma waves when surrounded by either neutral gas or a broad pre-generated plasma channel. Moreover, the shape and size of the first cavity of the wakefields correlates with the driver beam charge. The experimental results are supported by 3D particle-in-cell simulations performed with PIConGPU. This method can be extended to a detailed study of driver charge depletion by probing the evolution of the wakefield as it propagates through the plasma. This is an important step for further understanding and optimization of high energy efficiency PWFAs.
Published: 2022

38. Accompanying the hybrid LPWFA experiment campaign with a computer simulation campaign: What we model, what we learn, and where we need to become better

Author: (0000-0001-8965-1149) Steiniger, K., (0000-0001-7990-9564) Pausch, R., (0000-0003-3396-6154) Bastrakov, S., (0000-0003-0548-3999) Chang, Y.-Y., (0000-0001-9129-4208) Couperus Cabadağ, J. P., (0000-0002-4626-0049) Irman, A., (0000-0001-9759-1166) Köhler, A., Kurz, T., (0000-0002-2769-4749) Schöbel, S., (0000-0003-1642-0459) Widera, R., (0000-0003-0390-7671) Schramm, U., (0000-0003-4362-3438) Zarini, O., (0000-0002-3844-3697) Debus, A., (0000-0002-8258-3881) Bussmann, M., Heinemann, T., Assmann, R. W., Martinez De La Ossa, A., Hidding, B., Gilljohann, M. F., Ding, H., Götzfried, J., Schindler, S., Döpp, A., Karsch, S., Kononenko, O., Raj, G., Corde, S., (0000-0001-8965-1149) Steiniger, K., (0000-0001-7990-9564) Pausch, R., (0000-0003-3396-6154) Bastrakov, S., (0000-0003-0548-3999) Chang, Y.-Y., (0000-0001-9129-4208) Couperus Cabadağ, J. P., (0000-0002-4626-0049) Irman, A., (0000-0001-9759-1166) Köhler, A., Kurz, T., (0000-0002-2769-4749) Schöbel, S., (0000-0003-1642-0459) Widera, R., (0000-0003-0390-7671) Schramm, U., (0000-0003-4362-3438) Zarini, O., (0000-0002-3844-3697) Debus, A., (0000-0002-8258-3881) Bussmann, M., Heinemann, T., Assmann, R. W., Martinez De La Ossa, A., Hidding, B., Gilljohann, M. F., Ding, H., Götzfried, J., Schindler, S., Döpp, A., Karsch, S., Kononenko, O., Raj, G., and Corde, S.
Abstract: The Hybrid Collaboration, a joint undertaking by HZDR, DESY, University of Strathclyde, LMU, and LOA, performed hybrid LPWFA experiments which utilize electron bunches from a laser wakefield accelerator (LWFA) as drivers of a plasma wakefield stage (PWFA) to demonstrate the feasibility of compact PWFAs serving as a test bed for the efficient investigation and optimization of PWFAs and their development into brightness boosters. To better understand the microscopic, nonlinear dynamic of these accelerators, the experiments were accompanied by 3D3V particle-in-cell simulations using PIConGPU. Here, we present insights into the dynamics of the hybrid LPWFA that we gained from start-to-end simulations of the experimental setup at HZDR. These regard electron injections due to hydrodynamic shocks, beam self-modulation and breakup, and cavity elongation - all backed-up by synthetic diagnostics that allow direct comparison with experimental measurements. We discuss our approach to model these synthetic diagnostics directly within the PIConGPU simulation as well as modelling certain aspects of the experimental setup, such as the drive laser. Continuing this, the talk highlights a few recent technical advances in PIConGPU that enable better modelling of the micro-physics, experiment conditions, or signals of experiment diagnostics.
Published: 2022

39. Seeded FEL lasing of the COXINEL beamline driven by the HZDR plasma accelerator

Author: Labat, M., (0000-0001-9129-4208) Couperus Cabadağ, J. P., (0000-0003-1064-489X) Ghaith, A., (0000-0002-4626-0049) Irman, A., Berlioux, A., Berteaud, P., Blache, F., (0000-0002-1919-8585) Bock, S., Bouvet, F., Briquez, F., (0000-0003-0548-3999) Chang, Y.-Y., Corde, S., (0000-0002-3844-3697) Debus, A., Oliveira, C., Duval, J.-P., Dietrich, Y., El Ajjouri, M., Eisenmann, C., Gautier, J., Gebhardt, R., Grams, S., Helbig, U., Herbeaux, C., Hubert, N., Kitegi, C., Kononenko, O., (0000-0002-8145-5837) Kuntzsch, M., (0000-0003-3089-4087) La Berge, M., Le, S., Leluan, B., Loulergue, A., Malka, V., Marteau, F., Huy N. Guyen, M., Oumbarek-Espinos, D., (0000-0001-7990-9564) Pausch, R., Pereira, D., (0000-0002-4738-6436) Püschel, T., Ricaud, J.-P., Rommeluere, P., Roussel, E., Rousseau, P., (0000-0002-2769-4749) Schöbel, S., Sebdaoui, M., (0000-0001-8965-1149) Steiniger, K., Tavakoli, K., Thaury, C., (0000-0002-6463-5406) Ufer, P., Valleau, M., Vandenberghe, M., Veteran, J., (0000-0003-0390-7671) Schramm, U., Couprie, M.-E., Labat, M., (0000-0001-9129-4208) Couperus Cabadağ, J. P., (0000-0003-1064-489X) Ghaith, A., (0000-0002-4626-0049) Irman, A., Berlioux, A., Berteaud, P., Blache, F., (0000-0002-1919-8585) Bock, S., Bouvet, F., Briquez, F., (0000-0003-0548-3999) Chang, Y.-Y., Corde, S., (0000-0002-3844-3697) Debus, A., Oliveira, C., Duval, J.-P., Dietrich, Y., El Ajjouri, M., Eisenmann, C., Gautier, J., Gebhardt, R., Grams, S., Helbig, U., Herbeaux, C., Hubert, N., Kitegi, C., Kononenko, O., (0000-0002-8145-5837) Kuntzsch, M., (0000-0003-3089-4087) La Berge, M., Le, S., Leluan, B., Loulergue, A., Malka, V., Marteau, F., Huy N. Guyen, M., Oumbarek-Espinos, D., (0000-0001-7990-9564) Pausch, R., Pereira, D., (0000-0002-4738-6436) Püschel, T., Ricaud, J.-P., Rommeluere, P., Roussel, E., Rousseau, P., (0000-0002-2769-4749) Schöbel, S., Sebdaoui, M., (0000-0001-8965-1149) Steiniger, K., Tavakoli, K., Thaury, C., (0000-0002-6463-5406) Ufer, P., Valleau, M., Vandenberghe, M., Veteran, J., (0000-0003-0390-7671) Schramm, U., and Couprie, M.-E.
Abstract: Laser Plasma Accelerators (LPAs), harnessing gigavolt-per-centimeter accelerating fields, can generate high peak current, low emittance and GeV class electron beams paving the way for the realization of future compact free-electron lasers (FELs). Here, we report on the commissioning of the COXINEL beamline driven by the HZDR plasma accelerator and experimental demonstration of FEL lasing at 270 nm in a seeded configuration. Control over the radiation wavelength is achieved with an improved bandwidth stability. Furthermore, the appearance of interference fringes, resulting from the interaction between the phase-locked emitted radiation and the seed, confirms longitudinal coherence, representing a key feature of such a seeded FEL. These results are cross-checked with simulations, ELEGANT for beam optics and GENESIS for FEL radiation. We anticipate a navigable pathway toward smaller-scale free-electron lasers at extreme ultra-violet wavelengths.
Published: 2022

40. Experimental results of Trojan horse injection in a hybrid LPWFA

Author: (0000-0002-6463-5406) Ufer, P., Nutter, A., (0000-0003-0548-3999) Chang, Y.-Y., (0000-0002-5015-0387) Corde, S., (0000-0001-9129-4208) Couperus Cabadağ, J. P., (0000-0002-3844-3697) Debus, A., (0000-0003-2913-5729) Döpp, A., (0000-0001-7747-1650) Heinemann, T., (0000-0002-5827-0041) Hidding, B., Gilljohann, M., (0000-0003-0746-0731) Karsch, S., (0000-0001-9759-1166) Köhler, A., (0000-0003-1757-0985) Kononenko, O., (0000-0001-7990-9564) Pausch, R., (0000-0002-2769-4749) Schöbel, S., (0000-0001-8158-0980) Martinez De La Ossa, A., (0000-0003-0390-7671) Schramm, U., (0000-0002-4626-0049) Irman, A., (0000-0002-6463-5406) Ufer, P., Nutter, A., (0000-0003-0548-3999) Chang, Y.-Y., (0000-0002-5015-0387) Corde, S., (0000-0001-9129-4208) Couperus Cabadağ, J. P., (0000-0002-3844-3697) Debus, A., (0000-0003-2913-5729) Döpp, A., (0000-0001-7747-1650) Heinemann, T., (0000-0002-5827-0041) Hidding, B., Gilljohann, M., (0000-0003-0746-0731) Karsch, S., (0000-0001-9759-1166) Köhler, A., (0000-0003-1757-0985) Kononenko, O., (0000-0001-7990-9564) Pausch, R., (0000-0002-2769-4749) Schöbel, S., (0000-0001-8158-0980) Martinez De La Ossa, A., (0000-0003-0390-7671) Schramm, U., and (0000-0002-4626-0049) Irman, A.
Abstract: A hybrid (LPWFA) plasma accelerator combines the two schemes of plasma acceleration, using a laser (LWFA) and an electron beam (PWFA) to drive the plasma wave, with the goal to combine the advantages of both methods. This concept allows studies of PWFA-physics in compact setups as well as generating high-quality electron beams to fulfill the demands of secondary light sources like FELs. We present experimental results from hybrid plasma accelerators using plasma cathode injection also known as Trojan horse injection. A short-pulsed laser is used as the injector in the second stage of the accelerator propagating perpendicular to the electron beam. When timed such, that injector laser and the first cavity of the wakefield overlap, the creation of low-energy-spread witness beams have been observed.
Published: 2022

41. Synthetic shadowgrams of laser-plasma accelerators computed by a PIConGPU in-situ plugin

Author: (0009-0008-0365-5164) Carstens, F.-O., (0000-0001-8965-1149) Steiniger, K., (0000-0001-7990-9564) Pausch, R., (0000-0003-0548-3999) Chang, Y.-Y., (0000-0002-2769-4749) Schöbel, S., (0000-0001-9129-4208) Couperus Cabadağ, J. P., (0000-0002-4626-0049) Irman, A., Lehmann, M., (0000-0003-1642-0459) Widera, R., (0000-0002-8258-3881) Bussmann, M., (0000-0003-0390-7671) Schramm, U., (0000-0002-5845-000X) Cowan, T., (0000-0002-3844-3697) Debus, A., (0009-0008-0365-5164) Carstens, F.-O., (0000-0001-8965-1149) Steiniger, K., (0000-0001-7990-9564) Pausch, R., (0000-0003-0548-3999) Chang, Y.-Y., (0000-0002-2769-4749) Schöbel, S., (0000-0001-9129-4208) Couperus Cabadağ, J. P., (0000-0002-4626-0049) Irman, A., Lehmann, M., (0000-0003-1642-0459) Widera, R., (0000-0002-8258-3881) Bussmann, M., (0000-0003-0390-7671) Schramm, U., (0000-0002-5845-000X) Cowan, T., and (0000-0002-3844-3697) Debus, A.
Abstract: Few-cycle shadowgraphy is a valuable diagnostic for laser-plasma accelerators to obtain insight into the µm- and fs-scale relativistic plasma dynamics. To enhance the understanding of experimental shadowgrams we developed a synthetic shadowgram diagnostic within the fully relativistic particle-in-cell code PIConGPU. In an initial version of the synthetic shadowgraphy diagnostic, the probe laser is propagated through the plasma using PIConGPU, and then extracted and propagated onto a virtual CCD using a post-processing code based on Fourier optics. However, the latter step requires 3D-FFTs, which results in performance and scaling limitations in large-scale simulations. To circumvent this, we develop an in-situ plugin for PIConGPU, in which we extract the probe laser slice-wise to obtain the synthetic shadowgrams during the simulation without post-processing. In this talk, we present the development of the PIConGPU plugin and show preliminary results of synthetic shadowgrams for laser and plasma wakefield accelerators.
Published: 2022

42. Excitation of beam driven plasma waves in a hybrid LPWFA

Author: (0000-0002-2769-4749) Schöbel, S., (0000-0001-7990-9564) Pausch, R., (0009-0008-0365-5164) Carstens, F.-O., (0000-0003-0548-3999) Chang, Y.-Y., (0000-0002-5015-0387) Corde, S., (0000-0001-9129-4208) Couperus Cabadağ, J. P., (0000-0002-3844-3697) Debus, A., (0000-0003-4713-0331) Ding, H., (0000-0003-2913-5729) Döpp, A., (0000-0001-7747-1650) Heinemann, T., (0000-0002-5827-0041) Hidding, B., Gilljohann, M., (0000-0003-0746-0731) Karsch, S., (0000-0001-9759-1166) Köhler, A., (0000-0003-1757-0985) Kononenko, O., Nutter, A., (0000-0002-6463-5406) Ufer, P., (0000-0001-8158-0980) Martinez De La Ossa, A., (0000-0003-0390-7671) Schramm, U., (0000-0002-4626-0049) Irman, A., (0000-0002-2769-4749) Schöbel, S., (0000-0001-7990-9564) Pausch, R., (0009-0008-0365-5164) Carstens, F.-O., (0000-0003-0548-3999) Chang, Y.-Y., (0000-0002-5015-0387) Corde, S., (0000-0001-9129-4208) Couperus Cabadağ, J. P., (0000-0002-3844-3697) Debus, A., (0000-0003-4713-0331) Ding, H., (0000-0003-2913-5729) Döpp, A., (0000-0001-7747-1650) Heinemann, T., (0000-0002-5827-0041) Hidding, B., Gilljohann, M., (0000-0003-0746-0731) Karsch, S., (0000-0001-9759-1166) Köhler, A., (0000-0003-1757-0985) Kononenko, O., Nutter, A., (0000-0002-6463-5406) Ufer, P., (0000-0001-8158-0980) Martinez De La Ossa, A., (0000-0003-0390-7671) Schramm, U., and (0000-0002-4626-0049) Irman, A.
Abstract: High peak current electron beams from laser wakefield accelerators (LWFA) are capable to drive a particle driven wakefield (PWFA) in a subsequent stage. The intrinsic short duration of these driver beams opens the possibility for PWFA studies in a higher density regime of the order of 1018·cm-3. Since optical probing provides a reasonable contrast at this density range, direct insight into the particle-driven wakefields is possible. Here we present the results of femtosecond optical probing of such beam driven wakefields, showing pronounced differences in the morphology of beam driven plasma waves when surrounded by either neutral gas or a broad pre-generated plasma channel. Moreover, the shape and size of the first cavity of the wakefields correlates with the driver beam charge. The experimental results are supported by 3D particle-in-cell simulations performed with PIConGPU. This method can be extended to a detailed study of driver charge depletion by probing the evolution of the wakefield as it propagates through the plasma. This is an important step for further understanding and optimization of high energy efficiency PWFAs.
Published: 2022

43. Seeded FEL lasing of the COXINEL beamline driven by the HZDR plasma accelerator

Author: Labat, M., (0000-0001-9129-4208) Couperus Cabadağ, J. P., (0000-0003-1064-489X) Ghaith, A., (0000-0002-4626-0049) Irman, A., Berlioux, A., Berteaud, P., Blache, F., (0000-0002-1919-8585) Bock, S., Bouvet, F., Briquez, F., (0000-0003-0548-3999) Chang, Y.-Y., Corde, S., (0000-0002-3844-3697) Debus, A., Oliveira, C., Duval, J.-P., Dietrich, Y., El Ajjouri, M., Eisenmann, C., Gautier, J., Gebhardt, R., Grams, S., Helbig, U., Herbeaux, C., Hubert, N., Kitegi, C., Kononenko, O., (0000-0002-8145-5837) Kuntzsch, M., (0000-0003-3089-4087) La Berge, M., Le, S., Leluan, B., Loulergue, A., Malka, V., Marteau, F., Huy N. Guyen, M., Oumbarek-Espinos, D., (0000-0001-7990-9564) Pausch, R., Pereira, D., (0000-0002-4738-6436) Püschel, T., Ricaud, J.-P., Rommeluere, P., Roussel, E., Rousseau, P., (0000-0002-2769-4749) Schöbel, S., Sebdaoui, M., (0000-0001-8965-1149) Steiniger, K., Tavakoli, K., Thaury, C., (0000-0002-6463-5406) Ufer, P., Valleau, M., Vandenberghe, M., Veteran, J., (0000-0003-0390-7671) Schramm, U., Couprie, M.-E., Labat, M., (0000-0001-9129-4208) Couperus Cabadağ, J. P., (0000-0003-1064-489X) Ghaith, A., (0000-0002-4626-0049) Irman, A., Berlioux, A., Berteaud, P., Blache, F., (0000-0002-1919-8585) Bock, S., Bouvet, F., Briquez, F., (0000-0003-0548-3999) Chang, Y.-Y., Corde, S., (0000-0002-3844-3697) Debus, A., Oliveira, C., Duval, J.-P., Dietrich, Y., El Ajjouri, M., Eisenmann, C., Gautier, J., Gebhardt, R., Grams, S., Helbig, U., Herbeaux, C., Hubert, N., Kitegi, C., Kononenko, O., (0000-0002-8145-5837) Kuntzsch, M., (0000-0003-3089-4087) La Berge, M., Le, S., Leluan, B., Loulergue, A., Malka, V., Marteau, F., Huy N. Guyen, M., Oumbarek-Espinos, D., (0000-0001-7990-9564) Pausch, R., Pereira, D., (0000-0002-4738-6436) Püschel, T., Ricaud, J.-P., Rommeluere, P., Roussel, E., Rousseau, P., (0000-0002-2769-4749) Schöbel, S., Sebdaoui, M., (0000-0001-8965-1149) Steiniger, K., Tavakoli, K., Thaury, C., (0000-0002-6463-5406) Ufer, P., Valleau, M., Vandenberghe, M., Veteran, J., (0000-0003-0390-7671) Schramm, U., and Couprie, M.-E.
Abstract: Laser Plasma Accelerators (LPAs), harnessing gigavolt-per-centimeter accelerating fields, can generate high peak current, low emittance and GeV class electron beams paving the way for the realization of future compact free-electron lasers (FELs). Here, we report on the commissioning of the COXINEL beamline driven by the HZDR plasma accelerator and experimental demonstration of FEL lasing at 270 nm in a seeded configuration. Control over the radiation wavelength is achieved with an improved bandwidth stability. Furthermore, the appearance of interference fringes, resulting from the interaction between the phase-locked emitted radiation and the seed, confirms longitudinal coherence, representing a key feature of such a seeded FEL. These results are cross-checked with simulations, ELEGANT for beam optics and GENESIS for FEL radiation. We anticipate a navigable pathway toward smaller-scale free-electron lasers at extreme ultra-violet wavelengths.
Published: 2022

44. Gas-dynamic density downramp injection in a beam-driven plasma wakefield accelerator

Author: (0000-0001-9129-4208) Couperus Cabadağ, J. P., (0000-0001-7990-9564) Pausch, R., (0000-0002-2769-4749) Schöbel, S., (0000-0002-8258-3881) Bussmann, M., (0000-0003-0548-3999) Chang, Y.-Y., Corde, S., (0000-0002-3844-3697) Debus, A., Ding, H., Dopp, A., Foerster, F. M., Gilljohann, M., Haberstroh, F., Heinemann, T., Hidding, B., Karsch, S., (0000-0001-9759-1166) Köhler, A., Kononenko, O., Knetsch, A., Kurz, T., Martinez De La Ossa, A., Nutter, A., Raj, G., (0000-0001-8965-1149) Steiniger, K., (0000-0003-0390-7671) Schramm, U., (0000-0002-6463-5406) Ufer, P., (0000-0002-4626-0049) Irman, A., (0000-0001-9129-4208) Couperus Cabadağ, J. P., (0000-0001-7990-9564) Pausch, R., (0000-0002-2769-4749) Schöbel, S., (0000-0002-8258-3881) Bussmann, M., (0000-0003-0548-3999) Chang, Y.-Y., Corde, S., (0000-0002-3844-3697) Debus, A., Ding, H., Dopp, A., Foerster, F. M., Gilljohann, M., Haberstroh, F., Heinemann, T., Hidding, B., Karsch, S., (0000-0001-9759-1166) Köhler, A., Kononenko, O., Knetsch, A., Kurz, T., Martinez De La Ossa, A., Nutter, A., Raj, G., (0000-0001-8965-1149) Steiniger, K., (0000-0003-0390-7671) Schramm, U., (0000-0002-6463-5406) Ufer, P., and (0000-0002-4626-0049) Irman, A.
Abstract: We present the experimental demonstration of density downramp injection at a gas-dynamic shock in a beam-driven plasma accelerator. The ultrashort driver electron beam with a peak-current exceeding 10 kA allows operation in the blowout regime and enables injection of electron witness bunches at gentle density ramps, i.e. longer than the plasma wavelength, which nurtures prospects for ultralow bunch emittance. By precision control over the position of injection we show that these bunches can be energy-tuned in acceleration gradients of near 120 GV/m.
Published: 2021

45. Demonstration of a compact plasma accelerator powered by laser-accelerated electron beams

Author: (0000-0003-0340-9963) Kurz, T., Heinemann, T., Gilljohann, M. F., (0000-0003-0548-3999) Chang, Y.-Y., (0000-0001-9129-4208) Couperus Cabadağ, J. P., (0000-0002-3844-3697) Debus, A., Kononenko, O., (0000-0001-7990-9564) Pausch, R., (0000-0002-2769-4749) Schöbel, S., Assmann, R. W., (0000-0002-8258-3881) Bussmann, M., Ding, H., Götzfried, J., (0000-0001-9759-1166) Köhler, A., Raj, G., Schindler, S., (0000-0001-8965-1149) Steiniger, K., (0000-0003-4362-3438) Zarini, O., Corde, S., Döpp, A., Hidding, B., Karsch, S., (0000-0003-0390-7671) Schramm, U., Martinez De La Ossa, A., (0000-0002-4626-0049) Irman, A., (0000-0003-0340-9963) Kurz, T., Heinemann, T., Gilljohann, M. F., (0000-0003-0548-3999) Chang, Y.-Y., (0000-0001-9129-4208) Couperus Cabadağ, J. P., (0000-0002-3844-3697) Debus, A., Kononenko, O., (0000-0001-7990-9564) Pausch, R., (0000-0002-2769-4749) Schöbel, S., Assmann, R. W., (0000-0002-8258-3881) Bussmann, M., Ding, H., Götzfried, J., (0000-0001-9759-1166) Köhler, A., Raj, G., Schindler, S., (0000-0001-8965-1149) Steiniger, K., (0000-0003-4362-3438) Zarini, O., Corde, S., Döpp, A., Hidding, B., Karsch, S., (0000-0003-0390-7671) Schramm, U., Martinez De La Ossa, A., and (0000-0002-4626-0049) Irman, A.
Abstract: Plasma wakefield accelerators are capable of sustaining gigavolt-per-centimeter accelerating fields, surpassing the electric breakdown threshold in state-of-the-art accelerator modules by 3-4 orders of magnitude. Beam-driven wakefields offer particularly attractive conditions for the generation and acceleration of high-quality beams. However, this scheme relies on kilometer-scale accelerators. Here, we report on the demonstration of a millimeter-scale plasma accelerator powered by laser-accelerated electron beams. We showcase the acceleration of electron beams to 128 MeV, consistent with simulations exhibiting accelerating gradients exceeding 100 GVm⁻¹. This miniaturized accelerator is further explored by employing a controlled pair of drive and witness electron bunches, where a fraction of the driver energy is transferred to the accelerated witness through the plasma. Such a hybrid approach allows fundamental studies of beam-driven plasma accelerator concepts at widely accessible high-power laser facilities. It is anticipated to provide compact sources of energetic high-brightness electron beams for quality-demanding applications such as free-electron lasers.
Published: 2021

46. Restoring betatron phase coherence in a beam-loaded laser-wakefield accelerator

Author: (0000-0001-9759-1166) Köhler, A., (0000-0001-7990-9564) Pausch, R., (0000-0002-8258-3881) Bussmann, M., (0000-0001-9129-4208) Couperus Cabadağ, J. P., (0000-0002-3844-3697) Debus, A., Krämer, J. M., (0000-0002-2769-4749) Schöbel, S., (0000-0003-4362-3438) Zarini, O., (0000-0003-0390-7671) Schramm, U., (0000-0002-4626-0049) Irman, A., (0000-0001-9759-1166) Köhler, A., (0000-0001-7990-9564) Pausch, R., (0000-0002-8258-3881) Bussmann, M., (0000-0001-9129-4208) Couperus Cabadağ, J. P., (0000-0002-3844-3697) Debus, A., Krämer, J. M., (0000-0002-2769-4749) Schöbel, S., (0000-0003-4362-3438) Zarini, O., (0000-0003-0390-7671) Schramm, U., and (0000-0002-4626-0049) Irman, A.
Abstract: Matched beam loading in laser wakefield acceleration (LWFA), characterizing the state of flattening the accelerating electric field along the bunch, leads to the minimization of energy spread at high bunch charges. Here, we experimentally demonstrate by independently controlling injected charge and accelerating gradients, using the self-truncated ionization injection scheme, that minimal energy spread coincides with a reduction of the normalized beam divergence. With the simultaneous confirmation of the micrometer-small beam radius at the plasma exit, deduced from betatron radiation spectroscopy, we attribute this effect to the minimization of chromatic betatron decoherence. These findings are supported by rigorous three-dimensional particle-in-cell simulations tracking self-consistently particle trajectories from injection, acceleration until beam extraction to vacuum. We conclude that beam-loaded LWFA enables highest longitudinal and transverse phase space densities.
Published: 2021

47. Knowledge extraction in Laser-plasma simulations -- A case study on why start-to-end simulations are just the beginning

Author: (0000-0002-3844-3697) Debus, A., (0000-0001-7990-9564) Pausch, R., (0000-0001-9759-1166) Köhler, A., (0000-0002-2769-4749) Schöbel, S., (0000-0001-9129-4208) Couperus Cabadağ, J. P., (0000-0002-4626-0049) Irman, A., (0000-0003-0390-7671) Schramm, U., (0000-0002-8258-3881) Bussmann, M., (0000-0002-3844-3697) Debus, A., (0000-0001-7990-9564) Pausch, R., (0000-0001-9759-1166) Köhler, A., (0000-0002-2769-4749) Schöbel, S., (0000-0001-9129-4208) Couperus Cabadağ, J. P., (0000-0002-4626-0049) Irman, A., (0000-0003-0390-7671) Schramm, U., and (0000-0002-8258-3881) Bussmann, M.
Abstract: Based on a recent laser-wakefield acceleratror experiment studying the electron beam dynamics during acceleration using betatron radiation diagnostics, we present the knowledge-extraction challenges in modeling recent experiments with particle-in-cell simulations such as PIConGPU. Lessons learnt: * Matching experiment and simulation results via start-to-end simulations is essential, but not the end. It is the beginning for knowledge extraction to gain physics understanding. * In-situ diagnostics toolkit needs to be flexible enough to minimize post-processing. * Reduced models help distinguishing, understanding and excluding different physics processes. * Particularly intermediate simulation states, such as particle distributions after ionization injection, need to be filterable and interfacable to other codes (--> openPMD). * Outlook: Next generation of simulations requires more than one order more data. In-situ diagnostics and machine-learning methods need to be further extended.
Published: 2021

48. Single-shot diagnostics development for high power laser driven relativistic plasma experiments at the Helmholtz-Zentrum Dresden-Rossendorf

Author: (0000-0002-1919-8585) Bock, S., (0000-0002-4738-6436) Püschel, T., Helbig, U., Gebhardt, R., Oksenhendler, T., (0000-0003-1739-0159) Bernert, C., (0000-0001-9129-4208) Couperus Cabadağ, J. P., (0000-0002-3727-7017) Ziegler, T., (0000-0002-2769-4749) Schöbel, S., (0000-0003-3926-409X) Zeil, K., (0000-0002-4626-0049) Irman, A., (0000-0001-7986-3631) Toncian, T., (0000-0002-5845-000X) Cowan, T., (0000-0003-0390-7671) Schramm, U., (0000-0002-1919-8585) Bock, S., (0000-0002-4738-6436) Püschel, T., Helbig, U., Gebhardt, R., Oksenhendler, T., (0000-0003-1739-0159) Bernert, C., (0000-0001-9129-4208) Couperus Cabadağ, J. P., (0000-0002-3727-7017) Ziegler, T., (0000-0002-2769-4749) Schöbel, S., (0000-0003-3926-409X) Zeil, K., (0000-0002-4626-0049) Irman, A., (0000-0001-7986-3631) Toncian, T., (0000-0002-5845-000X) Cowan, T., and (0000-0003-0390-7671) Schramm, U.
Abstract: At the HZDR TO-AC contrast measurement tools and newly developed single-shot diagnostics characterizing laser pulses are applied for laser improvements and particle acceleration experiments. An overview of the applied techniques and recent results is presented.
Published: 2020

49. Start-to-end simulations Modeling hybrid plasma accelerator experiments with PIConGPU

Author: (0000-0001-7990-9564) Pausch, R., (0000-0002-8029-5755) Bachmann, M., (0000-0001-6994-2475) Garten, M., (0000-0003-1943-7141) Hübl, A., (0000-0001-8965-1149) Steiniger, K., (0000-0003-1642-0459) Widera, R., (0000-0003-0340-9963) Kurz, T., (0000-0002-2769-4749) Schöbel, S., (0000-0003-0548-3999) Chang, Y.-Y., (0000-0001-9129-4208) Couperus Cabadağ, J. P., (0000-0001-9759-1166) Köhler, A., (0000-0003-4362-3438) Zarini, O., Heinemann, T., Ding, H., Döpp, A., Gilljohann, M. F., Kononenko, O., Raj, G., Corde, S., Hidding, B., Karsch, S., Assmann, R., Martinez De La Ossa, A., (0000-0002-4626-0049) Irman, A., (0000-0003-0390-7671) Schramm, U., (0000-0002-3844-3697) Debus, A., (0000-0001-7990-9564) Pausch, R., (0000-0002-8029-5755) Bachmann, M., (0000-0001-6994-2475) Garten, M., (0000-0003-1943-7141) Hübl, A., (0000-0001-8965-1149) Steiniger, K., (0000-0003-1642-0459) Widera, R., (0000-0003-0340-9963) Kurz, T., (0000-0002-2769-4749) Schöbel, S., (0000-0003-0548-3999) Chang, Y.-Y., (0000-0001-9129-4208) Couperus Cabadağ, J. P., (0000-0001-9759-1166) Köhler, A., (0000-0003-4362-3438) Zarini, O., Heinemann, T., Ding, H., Döpp, A., Gilljohann, M. F., Kononenko, O., Raj, G., Corde, S., Hidding, B., Karsch, S., Assmann, R., Martinez De La Ossa, A., (0000-0002-4626-0049) Irman, A., (0000-0003-0390-7671) Schramm, U., and (0000-0002-3844-3697) Debus, A.
Abstract: A brief summary of the evolution of LPWFA hybrid simulations and why start-to end simulations are needed to model the LPWFA setup.
Published: 2020

50. First demonstration of a hybrid laser-electron-beam driven plasma wakefield accelerator

Author: (0000-0003-0340-9963) Kurz, T., Heinemann, T., (0000-0002-2769-4749) Schöbel, S., (0000-0001-9129-4208) Couperus Cabadağ, J. P., Kononenko, O., (0000-0003-0548-3999) Chang, Y.-Y., (0000-0002-8258-3881) Bussmann, M., (0000-0002-5015-0387) Corde, S., (0000-0002-3844-3697) Debus, A., (0000-0003-4713-0331) Ding, H., (0000-0003-2913-5729) Döpp, A., Gilljohann, M. F., Hidding, B., (0000-0003-0746-0731) Karsch, S., (0000-0001-9759-1166) Köhler, A., (0000-0001-7990-9564) Pausch, R., (0000-0003-4362-3438) Zarini, O., (0000-0003-0390-7671) Schramm, U., (0000-0001-8158-0980) Martinez De La Ossa, A., (0000-0002-4626-0049) Irman, A., (0000-0003-0340-9963) Kurz, T., Heinemann, T., (0000-0002-2769-4749) Schöbel, S., (0000-0001-9129-4208) Couperus Cabadağ, J. P., Kononenko, O., (0000-0003-0548-3999) Chang, Y.-Y., (0000-0002-8258-3881) Bussmann, M., (0000-0002-5015-0387) Corde, S., (0000-0002-3844-3697) Debus, A., (0000-0003-4713-0331) Ding, H., (0000-0003-2913-5729) Döpp, A., Gilljohann, M. F., Hidding, B., (0000-0003-0746-0731) Karsch, S., (0000-0001-9759-1166) Köhler, A., (0000-0001-7990-9564) Pausch, R., (0000-0003-4362-3438) Zarini, O., (0000-0003-0390-7671) Schramm, U., (0000-0001-8158-0980) Martinez De La Ossa, A., and (0000-0002-4626-0049) Irman, A.
Abstract: Plasma based electron acceleration is widely considered as a promising concept for a compact electron accelerator with broad range of future applications from high energy physics to photon science. These accelerators can be powered by either ultra-intense laser beams (LWFA) or relativistic high-current-density particle beams (PWFA). Here, we report on a novel approach which combines both schemes in a truly compact experimental setup. In our “LWFA + PWFA” hybrid accelerator, the electron beam generated by a LWFA stage drives a subsequent PWFA stage where a witness beam is trapped and accelerated. This strategy aims to combine the unique features of both plasma acceleration techniques, the LWFA stage provides with a compact source of high-current electron beams required as PWFA drivers, while the PWFA stage acts as an energy and brightness transformer for the LWFA output. In this work, we show the first experimental evidence of accelerating a distinct witness bunch in a LWFA-driven PWFA (LPWFA), within only about one millimeter acceleration distance. In the beam self-ionizing case, we observe witness energies of around 50 MeV. By utilizing a counter-propagating pre-ionization laser, the interaction with the plasma becomes stronger, increasing the final energies to around 120 MeV. Thus, yielding a field gradient of (46+-11) GeV/m which is comparable to what has been shown at large scale facilities.
Published: 2019

Catalog

Books, media, physical & digital resources

See catalog results

Searchworks

Select search scope, currently: Articles Catalog books, media & more in Jio Institute collections Articles journal articles & other e-resources

Search

Search Constraints

Refine your results

Search Limiters

Publication Year Range

Publication Type

Database

61 results on '"(0000-0002-2769-4749) Schöbel, S."'

Search Results

Catalog

Select search scope, currently: Articles

Catalog

books, media & more in Jio Institute collections

Articles

journal articles & other e-resources