Author: "(0000-0001-6994-2475) Garten, M." - Searchworks@Jio Institute Digital Library Search Results

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122 results on '"(0000-0001-6994-2475) Garten, M."'

51. Exascale Plasma-Accelerator Simulations with PIConGPU

Author: (0000-0002-3844-3697) Debus, A., (0000-0003-4861-5584) Kluge, T., (0000-0003-1642-0459) Widera, R., (0000-0003-3396-6154) Bastrakov, S., (0000-0001-8965-1149) Steiniger, K., (0000-0001-6994-2475) Garten, M., Lebedev, A., (0000-0001-7990-9564) Pausch, R., Meyer, F., (0000-0001-7042-5088) Pöschel, F., (0000-0003-1761-2591) Kelling, J., (0000-0002-9935-4428) Juckeland, G., (0000-0001-7839-4386) Stephan, J., Herten, A., Chandrasekaran, S., (0000-0003-2914-1483) Leinhauser, M., Young, J., Davis, J. H., Diaz, J. M., Huebl, A., Hernandez, B., Chatterjee, R., Rogers, D., (0000-0002-8258-3881) Bussmann, M., (0000-0002-3844-3697) Debus, A., (0000-0003-4861-5584) Kluge, T., (0000-0003-1642-0459) Widera, R., (0000-0003-3396-6154) Bastrakov, S., (0000-0001-8965-1149) Steiniger, K., (0000-0001-6994-2475) Garten, M., Lebedev, A., (0000-0001-7990-9564) Pausch, R., Meyer, F., (0000-0001-7042-5088) Pöschel, F., (0000-0003-1761-2591) Kelling, J., (0000-0002-9935-4428) Juckeland, G., (0000-0001-7839-4386) Stephan, J., Herten, A., Chandrasekaran, S., (0000-0003-2914-1483) Leinhauser, M., Young, J., Davis, J. H., Diaz, J. M., Huebl, A., Hernandez, B., Chatterjee, R., Rogers, D., and (0000-0002-8258-3881) Bussmann, M.
Abstract: * Next-generation Laser-plasma Accelerators (protons and electrons) require fast and predictive 3D particle-in-cell simulations at the exascale. * PIConGPU is performance portable & available as a single source through Alpaka. * PIConGPU scales to the largest supercomputers of the world, leveraging Alpaka for running on the latest GPUs from NVIDIA (A100) and AMD (MI100) * HIP & OpenMP 5+ backends now available on Alpaka and PIConGPU. * PIConGPU performance scales on Juwels Booster and Summit machines. Starting from typical simulation applications and requirements in laser-plasma accelerators, we present the PIConGPU software stack and current scaling results on large-scale compute clusters. We show results from the Frontier CAAR project and the JUWELS Booster early-access project.
Published: 2021

52. Probing ultrafast laser plasma processes inside solids with resonant small angle X-ray scattering

Author: (0000-0002-6914-4083) Gaus, L., (0000-0003-3968-7498) Bischoff, L., (0000-0002-8258-3881) Bussmann, M., (0000-0002-0976-4416) Cunningham, E., (0000-0001-8756-181X) Curry, C. B., E, Juncheng, Galtier, E., (0000-0001-6608-9325) Gauthier, M., (0000-0002-7671-0901) Laso García, A., (0000-0001-6994-2475) Garten, M., (0000-0001-9112-0558) Glenzer, S., Grenzer, J., Gutt, C., Hartley, N., (0000-0003-1184-2097) Huang, L., Hübner, U., (0000-0002-6350-4180) Kraus, D., Lee, H. J., McBride, E. E., (0000-0002-9556-0662) Metzkes-Ng, J., Nagler, B., (0000-0003-0868-4745) Nakatsutsumi, M., (0000-0003-0131-0628) Nikl, J., Ota, M., Pelka, A., (0000-0003-0931-1350) Prencipe, I., Randolph, L., Rödel, M., Sakawa, Y., (0000-0003-4400-1315) Schlenvoigt, H.-P., (0000-0002-7162-7500) Smid, M., (0000-0003-1277-4241) Treffert, F., (0000-0001-8090-2626) Voigt, K., (0000-0003-3926-409X) Zeil, K., (0000-0002-5845-000X) Cowan, T., (0000-0003-0390-7671) Schramm, U., (0000-0003-4861-5584) Kluge, T., (0000-0002-6914-4083) Gaus, L., (0000-0003-3968-7498) Bischoff, L., (0000-0002-8258-3881) Bussmann, M., (0000-0002-0976-4416) Cunningham, E., (0000-0001-8756-181X) Curry, C. B., E, Juncheng, Galtier, E., (0000-0001-6608-9325) Gauthier, M., (0000-0002-7671-0901) Laso García, A., (0000-0001-6994-2475) Garten, M., (0000-0001-9112-0558) Glenzer, S., Grenzer, J., Gutt, C., Hartley, N., (0000-0003-1184-2097) Huang, L., Hübner, U., (0000-0002-6350-4180) Kraus, D., Lee, H. J., McBride, E. E., (0000-0002-9556-0662) Metzkes-Ng, J., Nagler, B., (0000-0003-0868-4745) Nakatsutsumi, M., (0000-0003-0131-0628) Nikl, J., Ota, M., Pelka, A., (0000-0003-0931-1350) Prencipe, I., Randolph, L., Rödel, M., Sakawa, Y., (0000-0003-4400-1315) Schlenvoigt, H.-P., (0000-0002-7162-7500) Smid, M., (0000-0003-1277-4241) Treffert, F., (0000-0001-8090-2626) Voigt, K., (0000-0003-3926-409X) Zeil, K., (0000-0002-5845-000X) Cowan, T., (0000-0003-0390-7671) Schramm, U., and (0000-0003-4861-5584) Kluge, T.
Abstract: Extreme states of matter exist throughout the universe e.g. inside planetary cores, stars or astrophysical jets. Such conditions can be generated in the laboratory in the interaction of powerful lasers with solids. Yet, the measurement of the subsequent plasma dynamics with regard to density, temperature and ionization is a major experimental challenge. However, ultra-short X-ray pulses provided by X-ray free electron lasers (XFELs) allow for dedicated studies, which are highly relevant to study laboratory astrophysics, laser-fusion research or laser-plasma-based particle acceleration. Here, we report on experiments that employ a novel ultrafast method, which allows to simultaneously access temperature, ionization state and nanometer scale expansion dynamics in high-intensity laser-driven solid-density plasmas with a single X-ray detector. Using this method, we gain access to the expansion dynamics of a buried layer in compound samples, and we measure opacity changes arising from bound-bound resonance transitions in highly ionized copper. The presence of highly ionized copper leads to a temperature estimate of at least 2 million Kelvin already after the first 100 femtoseconds following the high-intensity laser irradiation. More specifically, we make use of asymmetries in small-angle X-ray scattering (SAXS) patterns, which arise from different spatial distributions of absorption and scattering cross sections in nanostructured grating samples when we tune an XFEL to atomic resonant energies of copper. Thereby, changes in asymmetry can be connected with the evolution of the plasma expansion and ionization dynamics. The potential of XFEL-based resonant SAXS to obtain three-dimensional ultrafast, nanoscopic information on density and opacity may offer a unique path for the characterization of dynamic processes in High Energy Density plasmas.
Published: 2021

53. Proton beam quality enhancement by spectral phase control of a PW-class laser system

Author: (0000-0002-3727-7017) Ziegler, T., (0000-0001-5602-3007) Albach, D., Bernert, C., (0000-0002-1919-8585) Bock, S., (0000-0002-9859-2408) Brack, F.-E., (0000-0002-5845-000X) Cowan, T., (0000-0003-0420-3940) Dover, N. P., (0000-0001-6994-2475) Garten, M., (0000-0002-6914-4083) Gaus, L., Gebhardt, R., Goethel, I., Helbig, U., (0000-0002-4626-0049) Irman, A., Kiriyama, H., (0000-0003-4861-5584) Kluge, T., Kon, A., (0000-0002-0638-6990) Kraft, S., (0000-0002-0275-9892) Kroll, F., (0000-0001-7858-0007) Löser, M., (0000-0002-9556-0662) Metzkes-Ng, J., (0000-0001-8143-0827) Nishiuchi, M., (0000-0001-9236-8037) Obst-Hübl, L., Püschel, T., (0000-0001-6200-6406) Rehwald, M., (0000-0003-4400-1315) Schlenvoigt, H.-P., (0000-0003-0390-7671) Schramm, U., (0000-0003-3926-409X) Zeil, K., (0000-0002-3727-7017) Ziegler, T., (0000-0001-5602-3007) Albach, D., Bernert, C., (0000-0002-1919-8585) Bock, S., (0000-0002-9859-2408) Brack, F.-E., (0000-0002-5845-000X) Cowan, T., (0000-0003-0420-3940) Dover, N. P., (0000-0001-6994-2475) Garten, M., (0000-0002-6914-4083) Gaus, L., Gebhardt, R., Goethel, I., Helbig, U., (0000-0002-4626-0049) Irman, A., Kiriyama, H., (0000-0003-4861-5584) Kluge, T., Kon, A., (0000-0002-0638-6990) Kraft, S., (0000-0002-0275-9892) Kroll, F., (0000-0001-7858-0007) Löser, M., (0000-0002-9556-0662) Metzkes-Ng, J., (0000-0001-8143-0827) Nishiuchi, M., (0000-0001-9236-8037) Obst-Hübl, L., Püschel, T., (0000-0001-6200-6406) Rehwald, M., (0000-0003-4400-1315) Schlenvoigt, H.-P., (0000-0003-0390-7671) Schramm, U., and (0000-0003-3926-409X) Zeil, K.
Abstract: We report on experimental investigations of proton acceleration from solid foils irradiated with PW‑class laser‑pulses, where highest proton cut‑off energies were achieved for temporal pulse parameters that varied significantly from those of an ideally Fourier transform limited (FTL) pulse. Controlled spectral phase modulation of the driver laser by means of an acousto‑optic programmable dispersive filter enabled us to manipulate the temporal shape of the last picoseconds around the main pulse and to study the effect on proton acceleration from thin foil targets. The results show that applying positive third order dispersion values to short pulses is favourable for proton acceleration and can lead to maximum energies of 70 MeV in target normal direction at 18 J laser energy for thin plastic foils, significantly enhancing the maximum energy compared to ideally compressed FTL pulses. The paper further proves the robustness and applicability of this enhancement effect for the use of different target materials and thicknesses as well as laser energy and temporal intensity contrast settings. We demonstrate that application relevant proton beam quality was reliably achieved over many months of operation with appropriate control of spectral phase and temporal contrast conditions using a state‑of‑the‑art high‑repetition rate PW laser system.
Published: 2021

54. Surrogate Modeling of Ion Acceleration with Invertible Neural Networks

Author: Miethlinger, T., (0000-0001-6994-2475) Garten, M., Göthel, I., Hoffmann, N., (0000-0003-0390-7671) Schramm, U., (0000-0003-4861-5584) Kluge, T., Miethlinger, T., (0000-0001-6994-2475) Garten, M., Göthel, I., Hoffmann, N., (0000-0003-0390-7671) Schramm, U., and (0000-0003-4861-5584) Kluge, T.
Abstract: The interaction of overdense plasma with ultra-intense laser pulses presents a promising approach to enable the development of very compact ion sources. Prospective applications of high-energetic protons and ions include, but are not limited to, medical applications (in particular ion beam radiotherapy), laboratory astrophysics and nuclear fusion. However, current records for maximum proton energies (94 MeV, 2018) are still below the required values for the aforementioned applications (typically in the range of 150-250 MeV), and especially challenges such as stability and spectral control remain unsolved to this day. In particular, significant effort per experiment and a high-dimensional design space renders naive sampling approaches ineffective. Furthermore, due to the strong nonlinearities of the underlying laser-plasma physics, synthetic observations by means of particle-in-cell (PIC) simulations are computationally very costly, and the maximum distance between two sampling points is strongly limited as well. Consequently, in order to build useful surrogate models for future data generation and experimental understanding and control, a combination of highly optimized simulation codes (where we employ PIConGPU), powerful data-based methods, such as artificial neural networks (ANNs), and modern sampling approaches are essential. Specifically, we employ invertible neural networks for bidirectional learning of input (parameter) and output (observables) and convolutional autoencoder to reduce intermediate field data to a lower-dimensional latent representation.
Published: 2021

55. Surrogate Modelling of Ion Acceleration and Overdense Laser-Plasma Interactions

Author: Miethlinger, T., (0000-0001-6994-2475) Garten, M., Göthel, I., Hoffmann, N., (0000-0003-0390-7671) Schramm, U., (0000-0003-4861-5584) Kluge, T., Miethlinger, T., (0000-0001-6994-2475) Garten, M., Göthel, I., Hoffmann, N., (0000-0003-0390-7671) Schramm, U., and (0000-0003-4861-5584) Kluge, T.
Abstract: Interaction of an overdense plasma with ultra-intense laser pulses represents a promising route to enable the development of compact ion sources. Prospective applications of high-energetic protons and ions include, but are not limited to, medical applications, materials science and nuclear fusion. However, current records for maximum proton energies (94 MeV, Higginson Nat Commun 9, 724 2018) are still well below the required values for many applications (typically 150-250 MeV) and many challenges remain unsolved to this day. In particular, a high-dimensional parameter space, as well as considerable effort per observation, make it impossible to uniformly sample the parameter space by means of simulations, let alone experimentally, while simultaneously strong nonlinearities limit the coarseness of the grid. Consequently, a combination of modern sampling approaches, optimized simulation codes and powerful data-based methods are essential for building realistic surrogate models. More specifically, we want to employ invertible neural networks (Ardizzone arXiv:1808.04730, 2018) for bidirectional learning of input and output, and convolutional autoencoder (Vincent J. Mach. Learn. Res. 11, 12 2010) to reduce intermediate field data to a lower-dimensional latent representation.
Published: 2021

56. Stable acceleration of intense proton beams to energies beyond 80 MeV at rep-rated laser systems

Author: (0000-0002-3727-7017) Ziegler, T., (0000-0003-1739-0159) Bernert, C., (0000-0002-1919-8585) Bock, S., (0000-0002-9859-2408) Brack, F.-E., (0000-0002-5845-000X) Cowan, T., (0000-0003-0420-3940) Dover, N. P., (0000-0001-6994-2475) Garten, M., (0000-0002-6914-4083) Gaus, L., Göthel, I., Kiriyama, H., (0000-0003-4861-5584) Kluge, T., (0000-0002-0638-6990) Kraft, S., (0000-0002-0275-9892) Kroll, F., (0000-0002-9556-0662) Metzkes-Ng, J., (0000-0001-8143-0827) Nishiuchi, M., (0000-0002-4738-6436) Püschel, T., (0000-0001-6200-6406) Rehwald, M., (0000-0003-4400-1315) Schlenvoigt, H.-P., (0000-0003-0390-7671) Schramm, U., (0000-0003-3926-409X) Zeil, K., (0000-0002-3727-7017) Ziegler, T., (0000-0003-1739-0159) Bernert, C., (0000-0002-1919-8585) Bock, S., (0000-0002-9859-2408) Brack, F.-E., (0000-0002-5845-000X) Cowan, T., (0000-0003-0420-3940) Dover, N. P., (0000-0001-6994-2475) Garten, M., (0000-0002-6914-4083) Gaus, L., Göthel, I., Kiriyama, H., (0000-0003-4861-5584) Kluge, T., (0000-0002-0638-6990) Kraft, S., (0000-0002-0275-9892) Kroll, F., (0000-0002-9556-0662) Metzkes-Ng, J., (0000-0001-8143-0827) Nishiuchi, M., (0000-0002-4738-6436) Püschel, T., (0000-0001-6200-6406) Rehwald, M., (0000-0003-4400-1315) Schlenvoigt, H.-P., (0000-0003-0390-7671) Schramm, U., and (0000-0003-3926-409X) Zeil, K.
Abstract: We report on experimental investigations of proton acceleration from laser-irradiated solid foils with the Draco-PW laser, where highest proton cut-off energies were achieved for temporal pulse parameters that varied significantlyfrom those of an ideally Fourier transform limited (FTL) pulse. Controlled spectral phase modulation of the driver laser by means of an acousto-optic programmable dispersive filter enabled us to manipulate the temporal shape ofthe last picoseconds around the main pulse and to study the effect on proton acceleration from thin foil targets. The results show that short and asymmetric pulses generated by positive third order dispersion values are favourable for proton acceleration and can lead to maximum energies above 60 MeV at 18 J laser energy for thin plastic foils, effectively doubling the maximum energy compared to ideally compressed FTL pulses. This performance optimization was the key to perform worlds first dose-controlled in-vivo studies with laser accelerated protons. The talk will further report on experiments we have carried out in the relativistically induced transparancy regime where the target turns transparent during the laser pulse interaction. We show recent data how the experimental signatures of the accelerated protons in this regime change compared to standard TNSA conditions and how we could reproduce those results at another similar laser laser system.
Published: 2021

57. Ultra-short pulse laser-driven acceleration of protons to 80 MeV from density tailored cryogenic hydrogen jets

Author: (0000-0001-6200-6406) Rehwald, M., (0000-0003-1739-0159) Bernert, C., (0000-0002-9859-2408) Brack, F.-E., (0000-0002-5845-000X) Cowan, T., Curry, C. B., Fiuza, F., (0000-0001-6994-2475) Garten, M., (0000-0002-6914-4083) Gaus, L., Gauthier, M., Göde, S., Göthel, I., Glenzer, S. H., (0000-0003-1943-7141) Hübl, A., Kim, J. B., (0000-0003-4861-5584) Kluge, T., (0000-0002-0638-6990) Kraft, S., (0000-0002-0275-9892) Kroll, F., (0000-0002-9556-0662) Metzkes-Ng, J., (0000-0001-7858-0007) Löser, M., (0000-0001-9236-8037) Obst-Hübl, L., (0000-0003-4962-2153) Reimold, M., (0000-0003-4400-1315) Schlenvoigt, H.-P., Schoenwaelder, C., (0000-0003-0390-7671) Schramm, U., (0000-0002-4697-3014) Siebold, M., Treffert, F., (0000-0002-3727-7017) Ziegler, T., (0000-0003-3926-409X) Zeil, K., (0000-0001-6200-6406) Rehwald, M., (0000-0003-1739-0159) Bernert, C., (0000-0002-9859-2408) Brack, F.-E., (0000-0002-5845-000X) Cowan, T., Curry, C. B., Fiuza, F., (0000-0001-6994-2475) Garten, M., (0000-0002-6914-4083) Gaus, L., Gauthier, M., Göde, S., Göthel, I., Glenzer, S. H., (0000-0003-1943-7141) Hübl, A., Kim, J. B., (0000-0003-4861-5584) Kluge, T., (0000-0002-0638-6990) Kraft, S., (0000-0002-0275-9892) Kroll, F., (0000-0002-9556-0662) Metzkes-Ng, J., (0000-0001-7858-0007) Löser, M., (0000-0001-9236-8037) Obst-Hübl, L., (0000-0003-4962-2153) Reimold, M., (0000-0003-4400-1315) Schlenvoigt, H.-P., Schoenwaelder, C., (0000-0003-0390-7671) Schramm, U., (0000-0002-4697-3014) Siebold, M., Treffert, F., (0000-0002-3727-7017) Ziegler, T., and (0000-0003-3926-409X) Zeil, K.
Abstract: Laser plasma based particle accelerators have attracted great interest in fields where conventional accelerators reach limits based on size, cost or beam parameters. Designing future laser ion accelerators requires a high degree of control of the advanced acceleration schemes involved and predictive modelling capabilities. Here, we investigate the interaction of petawatt class laser pulses with a micrometer sized cryogenic hydrogen jet target. Controlled pre-expansion of the target by low intensity pre-pulses allowed for tailored density scans over more than two orders of magnitude. On-shot target characterization using two-color optical probing provided precise starting conditions for numerical simulations. For the optimal target density profile in the near critical regime proton energies of up to 80 MeV were observed which represents a two-fold increase with respect to the initial solid target case. Three-dimensional particle in cell simulations confirmed the transition between different acceleration mechanisms involved and suggested the magnetic-vortex regime to be responsible for the highest proton energies achieved.
Published: 2021

58. Off-harmonic optical probing of high intensity laser interaction with solid-density cryogenic hydrogen jet targets

Author: (0000-0003-1739-0159) Bernert, C., (0000-0001-5602-3007) Albach, D., (0000-0002-6928-2048) Assenbaum, S., (0000-0002-9859-2408) Brack, F.-E., (0000-0002-1919-8585) Bock, S., Curry, C. B., (0000-0001-6994-2475) Garten, M., (0000-0002-6914-4083) Gaus, L., Gauthier, M., Glenzer, S. H., Göde, S., Göthel, I., Kim, J. B., (0000-0003-4861-5584) Kluge, T., (0000-0002-0638-6990) Kraft, S., (0000-0002-8145-5837) Kuntzsch, M., (0000-0001-7858-0007) Löser, M., (0000-0002-9556-0662) Metzkes-Ng, J., (0000-0001-9236-8037) Obst-Hübl, L., (0000-0002-4738-6436) Püschel, T., (0000-0003-4400-1315) Schlenvoigt, H.-P., Schoenwaelder, C., (0000-0002-4697-3014) Siebold, M., Treffert, F., (0000-0001-7332-7395) Umlandt, M. E. P., (0000-0002-2828-5373) Vescovi Pinochet, M. A., (0000-0003-3926-409X) Zeil, K., (0000-0002-3727-7017) Ziegler, T., (0000-0003-0390-7671) Schramm, U., (0000-0001-6200-6406) Rehwald, M., (0000-0003-1739-0159) Bernert, C., (0000-0001-5602-3007) Albach, D., (0000-0002-6928-2048) Assenbaum, S., (0000-0002-9859-2408) Brack, F.-E., (0000-0002-1919-8585) Bock, S., Curry, C. B., (0000-0001-6994-2475) Garten, M., (0000-0002-6914-4083) Gaus, L., Gauthier, M., Glenzer, S. H., Göde, S., Göthel, I., Kim, J. B., (0000-0003-4861-5584) Kluge, T., (0000-0002-0638-6990) Kraft, S., (0000-0002-8145-5837) Kuntzsch, M., (0000-0001-7858-0007) Löser, M., (0000-0002-9556-0662) Metzkes-Ng, J., (0000-0001-9236-8037) Obst-Hübl, L., (0000-0002-4738-6436) Püschel, T., (0000-0003-4400-1315) Schlenvoigt, H.-P., Schoenwaelder, C., (0000-0002-4697-3014) Siebold, M., Treffert, F., (0000-0001-7332-7395) Umlandt, M. E. P., (0000-0002-2828-5373) Vescovi Pinochet, M. A., (0000-0003-3926-409X) Zeil, K., (0000-0002-3727-7017) Ziegler, T., (0000-0003-0390-7671) Schramm, U., and (0000-0001-6200-6406) Rehwald, M.
Abstract: High-intensity short-pulse lasers enable novel compact accelerator schemes for the generation of energetic ion beams. The experimental investigation of the process remains challenging due to the femtosecond timescale and micrometer size of the acceleration. Commonly, diagnostic results are explained by a comparison of the experimental findings with computationally expensive particle-in-cell simulations. Cryogenic hydrogen jet targets (~30 critical densities) with µm-scale transverse size are particularly well suited for this approach. Time-resolved diagnostics like optical probing can infer the state of the target at the initialization time of the simulation and benchmark the simulation results. Here we present the implementation of an off-harmonic optical probing setup at an experiment for laser proton acceleration with a cylindrical hydrogen jet target at the DRACO PW laser with plasma-mirror cleaned laser contrast. We show under which conditions the technique overcomes the problem of parasitic plasma self-emission, present technical aspects of the off-harmonic probing technique together with experimental results of the observed plasma dynamics.
Published: 2021

59. High intensity laser interaction with solid-density cryogenic hydrogen jet targets

Author: (0000-0003-1739-0159) Bernert, C., (0000-0002-6928-2048) Assenbaum, S., (0000-0002-9859-2408) Brack, F.-E., (0000-0002-5845-000X) Cowan, T., B. Curry, C., Fiuza, F., (0000-0001-6994-2475) Garten, M., (0000-0002-6914-4083) Gaus, L., Gauthier, M., Göde, S., Göthel, I., Glenzer, S. H., (0000-0003-1943-7141) Hübl, A., (0000-0003-4861-5584) Kluge, T., (0000-0002-0638-6990) Kraft, S., (0000-0002-0275-9892) Kroll, F., (0000-0002-9556-0662) Metzkes-Ng, J., (0000-0001-7858-0007) Löser, M., (0000-0001-9236-8037) Obst-Hübl, L., (0000-0001-6200-6406) Rehwald, M., (0000-0003-4962-2153) Reimold, M., (0000-0003-4400-1315) Schlenvoigt, H.-P., Schoenwaelder, C., (0000-0003-0390-7671) Schramm, U., (0000-0002-4697-3014) Siebold, M., Treffert, F., (0000-0002-3727-7017) Ziegler, T., (0000-0003-3926-409X) Zeil, K., (0000-0003-1739-0159) Bernert, C., (0000-0002-6928-2048) Assenbaum, S., (0000-0002-9859-2408) Brack, F.-E., (0000-0002-5845-000X) Cowan, T., B. Curry, C., Fiuza, F., (0000-0001-6994-2475) Garten, M., (0000-0002-6914-4083) Gaus, L., Gauthier, M., Göde, S., Göthel, I., Glenzer, S. H., (0000-0003-1943-7141) Hübl, A., (0000-0003-4861-5584) Kluge, T., (0000-0002-0638-6990) Kraft, S., (0000-0002-0275-9892) Kroll, F., (0000-0002-9556-0662) Metzkes-Ng, J., (0000-0001-7858-0007) Löser, M., (0000-0001-9236-8037) Obst-Hübl, L., (0000-0001-6200-6406) Rehwald, M., (0000-0003-4962-2153) Reimold, M., (0000-0003-4400-1315) Schlenvoigt, H.-P., Schoenwaelder, C., (0000-0003-0390-7671) Schramm, U., (0000-0002-4697-3014) Siebold, M., Treffert, F., (0000-0002-3727-7017) Ziegler, T., and (0000-0003-3926-409X) Zeil, K.
Abstract: Ultra-intense short-pulse lasers in the Petawatt regime and intensity range of 1021W/cm2 offer the possibility to study new compact accelerator schemes by utilizing solid density targets for the generation of energetic ion beams. The optimization of the acceleration process demands comprehensive exploration of the involved plasma dynamics. This applies not only on the femtosecond but also on the pico- to nanosecond timescale, where the laser rising edge modifies the target prior to the 30 fs laser peak. Cryogenic hydrogen jet targets with µm-scale transverse size and solid density (5.2x1022 cm-3) offer the superb opportunity for renewable and debris-free acceleration sources and at the same time allow for comprehensive experimental investigation and realistic simulation of the rich physics involved in the laser target interaction. Here, we present the results of an experiment for laser proton acceleration from a cryogenic hydrogen jet target at the DRACO-PW laser. Optimized acceleration performance is achieved by tailoring the targets plasma density via hydrodynamic expansion induced by a short low-intensity pre-pulse. Optical shadowgraphy probing is utilized to give a realistic input of the targets plasma density for 3 dimensional particle-in-cell simulations of the particle acceleration process.
Published: 2021

60. Resonant SAXS data used in publication: 'Probing ultrafast laser plasma processes inside solids with resonant small angle X-ray scattering'

Author: (0000-0002-6914-4083) Gaus, L., (0000-0003-3968-7498) Bischoff, L., (0000-0002-8258-3881) Bussmann, M., (0000-0002-0976-4416) Cunningham, E., (0000-0001-8756-181X) Curry, C. B., E, Juncheng, Galtier, E., (0000-0001-6608-9325) Gauthier, M., (0000-0002-7671-0901) Laso García, A., (0000-0001-6994-2475) Garten, M., (0000-0001-9112-0558) Glenzer, S., Grenzer, J., Gutt, C., (0000-0002-6268-2436) Hartley, N., (0000-0003-1184-2097) Huang, L., Hübner, U., (0000-0002-6350-4180) Kraus, D., Lee, H. J., McBride, E. E., (0000-0002-9556-0662) Metzkes-Ng, J., Nagler, B., (0000-0003-0868-4745) Nakatsutsumi, M., (0000-0003-0131-0628) Nikl, J., Ota, M., Pelka, A., (0000-0003-0931-1350) Prencipe, I., Randolph, L., Rödel, M., Sakawa, Y., (0000-0003-4400-1315) Schlenvoigt, H.-P., (0000-0002-7162-7500) Smid, M., (0000-0003-1277-4241) Treffert, F., (0000-0001-8090-2626) Voigt, K., (0000-0003-3926-409X) Zeil, K., (0000-0002-5845-000X) Cowan, T., (0000-0003-0390-7671) Schramm, U., (0000-0003-4861-5584) Kluge, T., (0000-0002-6914-4083) Gaus, L., (0000-0003-3968-7498) Bischoff, L., (0000-0002-8258-3881) Bussmann, M., (0000-0002-0976-4416) Cunningham, E., (0000-0001-8756-181X) Curry, C. B., E, Juncheng, Galtier, E., (0000-0001-6608-9325) Gauthier, M., (0000-0002-7671-0901) Laso García, A., (0000-0001-6994-2475) Garten, M., (0000-0001-9112-0558) Glenzer, S., Grenzer, J., Gutt, C., (0000-0002-6268-2436) Hartley, N., (0000-0003-1184-2097) Huang, L., Hübner, U., (0000-0002-6350-4180) Kraus, D., Lee, H. J., McBride, E. E., (0000-0002-9556-0662) Metzkes-Ng, J., Nagler, B., (0000-0003-0868-4745) Nakatsutsumi, M., (0000-0003-0131-0628) Nikl, J., Ota, M., Pelka, A., (0000-0003-0931-1350) Prencipe, I., Randolph, L., Rödel, M., Sakawa, Y., (0000-0003-4400-1315) Schlenvoigt, H.-P., (0000-0002-7162-7500) Smid, M., (0000-0003-1277-4241) Treffert, F., (0000-0001-8090-2626) Voigt, K., (0000-0003-3926-409X) Zeil, K., (0000-0002-5845-000X) Cowan, T., (0000-0003-0390-7671) Schramm, U., and (0000-0003-4861-5584) Kluge, T.
Abstract: Resonant Small-angle x-ray scattering raw data obtained in measurements at MEC at LCLS and evalutation of the asymmetry in the scattering patterns. The data set is structured in case 1/Si-Cu-compound targets and case 2/Cu-only-targets as presented in the publication for on- and off-resonant XFEL probe energies.
Published: 2021

61. ComputationalRadiationPhysics/picongpu: C++14, New Solvers, I/O via openPMD API, HIP Support

Author: (0000-0003-3396-6154) Bastrakov, S., Bastrakova, K., (0009-0005-6873-8292) Marre, B. E., (0000-0002-3844-3697) Debus, A., (0000-0001-6994-2475) Garten, M., (0000-0001-7848-1690) Gruber, B. M., (0000-0003-1943-7141) Hübl, A., Trojok, J., (0000-0003-1761-2591) Kelling, J., Lebedev, A., Meyer, F., Ordyna, P., (0000-0001-7042-5088) Pöschel, F., Sprenger, L., (0000-0001-8965-1149) Steiniger, K., Wang, M., (0000-0001-5007-1868) Starke, S., Thévenet, M., (0000-0001-7990-9564) Pausch, R., (0000-0003-1642-0459) Widera, R., (0000-0003-3396-6154) Bastrakov, S., Bastrakova, K., (0009-0005-6873-8292) Marre, B. E., (0000-0002-3844-3697) Debus, A., (0000-0001-6994-2475) Garten, M., (0000-0001-7848-1690) Gruber, B. M., (0000-0003-1943-7141) Hübl, A., Trojok, J., (0000-0003-1761-2591) Kelling, J., Lebedev, A., Meyer, F., Ordyna, P., (0000-0001-7042-5088) Pöschel, F., Sprenger, L., (0000-0001-8965-1149) Steiniger, K., Wang, M., (0000-0001-5007-1868) Starke, S., Thévenet, M., (0000-0001-7990-9564) Pausch, R., and (0000-0003-1642-0459) Widera, R.
Abstract: This release switches to C++14 as minimum required version. Transition to C++17 is planned for upcoming releases. We extended PIConGPU with a few new solvers. Binary collisions are now available. We added arbitrary-order FDTD Maxwell's solver. All field solvers are now compatible with perfectly matched layer absorber, which became default. Yee solver now supports incident field generation using total field/scattered field technique. We added Higuera-Cary particle pusher and improved compatibility of pushers with probe species. Implementation of particle boundaries was extended to support custom positions, reflecting and thermal boundary kinds were added. With this release, PIConGPU fully switches to openPMD API library for performing I/O. The native HDF5 and ADIOS output plugins were replaced with a new openPMD plugin. All other plugins were updated to use openPMD API. Plugins generally support HDF5 and ADIOS2 backends of openPMD API, a user can choose file format based on their installation of openPMD API. We also added new plugins for SAXS and particle merging. We added support for HIP as a computational backend. In particular, it allows running on AMD GPUs. Several performance optimizations were added. Some functors and plugins now have performance-influencing parameters exposed to a user. The code was largely modernized and refactored, documentation was extended. Thanks to Sergei Bastrakov, Kseniia Bastrakova, Brian Edward Marre, Alexander Debus, Marco Garten, Bernhard Manfred Gruber, Axel Huebl, Jakob Trojok, Jeffrey Kelling, Anton Lebedev, Felix Meyer, Paweł Ordyna, Franz Poeschel, Lennert Sprenger, Klaus Steiniger, Manhui Wang, Sebastian Starke, Maxence Thévenet, Richard Pausch, René Widera for contributions to this release!
Published: 2021

62. Data publication: Efficient laser-driven proton and Bremsstrahlung generation from cluster-assembled foam targets

Author: (0000-0003-0931-1350) Prencipe, I., (0000-0002-9556-0662) Metzkes-Ng, J., (0000-0001-7486-2576) Pazzaglia, A., (0000-0003-1739-0159) Bernert, C., (0000-0002-7389-9307) Dellasega, D., (0000-0002-7215-4178) Fedeli, L., (0000-0002-7887-9313) Formenti, A., (0000-0001-6994-2475) Garten, M., (0000-0003-4861-5584) Kluge, T., (0000-0002-0638-6990) Kraft, S., (0000-0002-7671-0901) Laso García, A., (0000-0002-3388-5330) Maffini, A., (0000-0001-9236-8037) Obst-Hübl, L., (0000-0001-6200-6406) Rehwald, M., Sobiella, M., (0000-0003-3926-409X) Zeil, K., (0000-0003-0390-7671) Schramm, U., (0000-0002-5845-000X) Cowan, T., (0000-0002-7844-3691) Passoni, M., (0000-0003-0931-1350) Prencipe, I., (0000-0002-9556-0662) Metzkes-Ng, J., (0000-0001-7486-2576) Pazzaglia, A., (0000-0003-1739-0159) Bernert, C., (0000-0002-7389-9307) Dellasega, D., (0000-0002-7215-4178) Fedeli, L., (0000-0002-7887-9313) Formenti, A., (0000-0001-6994-2475) Garten, M., (0000-0003-4861-5584) Kluge, T., (0000-0002-0638-6990) Kraft, S., (0000-0002-7671-0901) Laso García, A., (0000-0002-3388-5330) Maffini, A., (0000-0001-9236-8037) Obst-Hübl, L., (0000-0001-6200-6406) Rehwald, M., Sobiella, M., (0000-0003-3926-409X) Zeil, K., (0000-0003-0390-7671) Schramm, U., (0000-0002-5845-000X) Cowan, T., and (0000-0002-7844-3691) Passoni, M.
Abstract: Archiving of raw and results data and scripts as describef in the associated paper
Published: 2021

63. Optimized laser ion acceleration at the relativistic critical density surface

Author: Göthel, I., (0000-0003-1739-0159) Bernert, C., (0000-0002-8258-3881) Bussmann, M., (0000-0001-6994-2475) Garten, M., Miethlinger, T., (0000-0001-6200-6406) Rehwald, M., (0000-0003-3926-409X) Zeil, K., (0000-0002-3727-7017) Ziegler, T., (0000-0002-5845-000X) Cowan, T., (0000-0003-0390-7671) Schramm, U., (0000-0003-4861-5584) Kluge, T., Göthel, I., (0000-0003-1739-0159) Bernert, C., (0000-0002-8258-3881) Bussmann, M., (0000-0001-6994-2475) Garten, M., Miethlinger, T., (0000-0001-6200-6406) Rehwald, M., (0000-0003-3926-409X) Zeil, K., (0000-0002-3727-7017) Ziegler, T., (0000-0002-5845-000X) Cowan, T., (0000-0003-0390-7671) Schramm, U., and (0000-0003-4861-5584) Kluge, T.
Abstract: In the effort of achieving high-energetic ion beams from the interaction of ultrashort laser pulses with a plasma, volumetric acceleration mechanisms beyond Target Normal Sheath Acceleration have gained attention. A relativisticly intense laser can turn a near critical density plasma slowly transparent, facilitating a synchronized acceleration of ions at the moving relativistic critical density front. While simulations promise extremely high ion energies in in this regime, the challenge resides in the realization of a synchronized movement of the ultra-relativistic laser pulse ($a_0\gtrsim 30$) driven reflective relativistic electron front and the fastest ions, which imposes a narrow parameter range on the laser and plasma parameters. We present an analytic model for the relevant processes, confirmed by a broad parameter simulation study in 1D- and 3D-geometry. By tayloring the pulse length and plasma density profile at the front side, we can optimize the proton acceleration performance and extend the regions in parameter space of efficient ion acceleration at the relativistic relativistic density surface.
Published: 2021

64. 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., Schöbel, S., 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., Schöbel, S., 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

65. PIConGPU Performance and Scaling Results on Summit

Author: (0000-0003-1642-0459) Widera, R., (0000-0003-3396-6154) Bastrakov, S., (0000-0002-3844-3697) Debus, A., (0000-0001-6994-2475) Garten, M., (0000-0001-7990-9564) Pausch, R., (0000-0001-8965-1149) Steiniger, K., (0000-0002-8258-3881) Bussmann, M., (0000-0003-1943-7141) Hübl, A., (0000-0003-1642-0459) Widera, R., (0000-0003-3396-6154) Bastrakov, S., (0000-0002-3844-3697) Debus, A., (0000-0001-6994-2475) Garten, M., (0000-0001-7990-9564) Pausch, R., (0000-0001-8965-1149) Steiniger, K., (0000-0002-8258-3881) Bussmann, M., and (0000-0003-1943-7141) Hübl, A.
Abstract: This talk present recent performance and scaling results of Particle-in-Cell code PIConGPU on the Summit supercomputer. PIConGPU is an open-source plasma simulation code for the Exascale era. It implements a wide range of core Particle-in-Cell numerical schemes and extensions, in-situ diagnostics, and high-performance I/O. Using single-source programming approach powered by alpaka library, PIConGPU runs on a variety of modern hardware, including both CPUs and GPUs. We demonstrate that it scales from a single workstation up to the full Summit supercomputer.
Published: 2020

66. Experimental control of laser proton acceleration beyond 50 MeV

Author: (0000-0002-3727-7017) Ziegler, T., Bernert, C., (0000-0002-1919-8585) Bock, S., (0000-0002-9859-2408) Brack, F.-E., (0000-0002-5845-000X) Cowan, T., (0000-0001-6994-2475) Garten, M., Gaus, L., Gebhardt, R., Helbig, U., (0000-0002-4626-0049) Irman, A., (0000-0002-4862-6569) Kiriyama, H., (0000-0003-4861-5584) Kluge, T., (0000-0002-0638-6990) Kraft, S., (0000-0002-0275-9892) Kroll, F., (0000-0002-9556-0662) Metzkes-Ng, J., (0000-0001-8143-0827) Nishiuchi, M., (0000-0001-9236-8037) Obst-Hübl, L., Püschel, T., (0000-0001-6200-6406) Rehwald, M., (0000-0003-4400-1315) Schlenvoigt, H.-P., (0000-0003-0390-7671) Schramm, U., (0000-0003-3926-409X) Zeil, K., (0000-0002-3727-7017) Ziegler, T., Bernert, C., (0000-0002-1919-8585) Bock, S., (0000-0002-9859-2408) Brack, F.-E., (0000-0002-5845-000X) Cowan, T., (0000-0001-6994-2475) Garten, M., Gaus, L., Gebhardt, R., Helbig, U., (0000-0002-4626-0049) Irman, A., (0000-0002-4862-6569) Kiriyama, H., (0000-0003-4861-5584) Kluge, T., (0000-0002-0638-6990) Kraft, S., (0000-0002-0275-9892) Kroll, F., (0000-0002-9556-0662) Metzkes-Ng, J., (0000-0001-8143-0827) Nishiuchi, M., (0000-0001-9236-8037) Obst-Hübl, L., Püschel, T., (0000-0001-6200-6406) Rehwald, M., (0000-0003-4400-1315) Schlenvoigt, H.-P., (0000-0003-0390-7671) Schramm, U., and (0000-0003-3926-409X) Zeil, K.
Abstract: We report on the ongoing plasma accelerator development at the HZDR, moving from plasma-acceleration studies towards real plasma-accelerators that can be controlled and applied in the lab. We show experimental investigations of proton acceleration from laser-irradiated solid foils with the DRACO PW laser, where highest proton cut-off energies were achieved for temporal pulse shape parameters well different from that of a Fourier transform limited (FTL) pulse. Controlled spectral phase modulation of the driver laser by means of an acousto-optic programmable dispersive filter enabled us to manipulate the temporal laser pulse shape and to study the effect on proton acceleration from thin foil targets. The results show that short and asymmetric pulses generated by positive third order dispersion values are favourable for proton acceleration and can lead to maximum energies of 60 MeV for thin plastic foils. Assuming appropriate control of the spectral phase of the laser and comparable temporal contrast conditions, we believe that the presented method can be universally applied to improve the proton acceleration performance using any other laser system operated in the PW regime.
Published: 2020

67. PIConGPU Performance and Scaling Results on Summit

Author: (0000-0003-1642-0459) Widera, R., (0000-0003-3396-6154) Bastrakov, S., (0000-0002-3844-3697) Debus, A., (0000-0001-6994-2475) Garten, M., (0000-0001-7990-9564) Pausch, R., (0000-0001-8965-1149) Steiniger, K., (0000-0002-8258-3881) Bussmann, M., (0000-0003-1943-7141) Hübl, A., (0000-0003-1642-0459) Widera, R., (0000-0003-3396-6154) Bastrakov, S., (0000-0002-3844-3697) Debus, A., (0000-0001-6994-2475) Garten, M., (0000-0001-7990-9564) Pausch, R., (0000-0001-8965-1149) Steiniger, K., (0000-0002-8258-3881) Bussmann, M., and (0000-0003-1943-7141) Hübl, A.
Abstract: This talk present recent performance and scaling results of Particle-in-Cell code PIConGPU on the Summit supercomputer. PIConGPU is an open-source plasma simulation code for the Exascale era. It implements a wide range of core Particle-in-Cell numerical schemes and extensions, in-situ diagnostics, and high-performance I/O. Using single-source programming approach powered by alpaka library, PIConGPU runs on a variety of modern hardware, including both CPUs and GPUs. We demonstrate that it scales from a single workstation up to the full Summit supercomputer.
Published: 2020

68. Spectral Control via Multi-Species Effects in PW-Class Laser-Ion Acceleration

Author: (0000-0003-1943-7141) Huebl, A., (0000-0001-6200-6406) Rehwald, M., (0000-0001-9236-8037) Obst-Huebl, L., (0000-0002-3727-7017) Ziegler, T., (0000-0001-6994-2475) Garten, M., (0000-0003-1642-0459) Widera, R., Zeil, K., (0000-0002-5845-000X) Cowan, T. E., (0000-0002-8258-3881) Bussmann, M., (0000-0003-0390-7671) Schramm, U., (0000-0003-4861-5584) Kluge, T., (0000-0003-1943-7141) Huebl, A., (0000-0001-6200-6406) Rehwald, M., (0000-0001-9236-8037) Obst-Huebl, L., (0000-0002-3727-7017) Ziegler, T., (0000-0001-6994-2475) Garten, M., (0000-0003-1642-0459) Widera, R., Zeil, K., (0000-0002-5845-000X) Cowan, T. E., (0000-0002-8258-3881) Bussmann, M., (0000-0003-0390-7671) Schramm, U., and (0000-0003-4861-5584) Kluge, T.
Abstract: Laser-ion acceleration with ultra-short pulse, PW-class lasers is dominated by non-thermal, intra-pulse plasma dynamics. The presence of multiple ion species or multiple charge states in targets leads to characteristic modulations and even mono-energetic features, depending on the choice of target material. As spectral signatures of generated ion beams are frequently used to characterize underlying acceleration mechanisms, thermal, multi-fluid descriptions require a revision for predictive capabilities and control in next-generation particle beam sources. We present an analytical model with explicit inter-species interactions, supported by extensive ab initio simulations. This enables us to derive important ensemble properties from the spectral distribution resulting from those multi-species effects for arbitrary mixtures. We further propose a potential experimental implementation with a novel cryogenic target, delivering jets with variable mixtures of hydrogen and deuterium. Free from contaminants and without strong influence of hardly controllable processes such as ionization dynamics, this would allow a systematic realization of our predictions for the multi-species effect.
Published: 2020

69. Atomic Physics in Particle in Cell Algorithms(PIC)

Author: (0009-0005-6873-8292) Marre, B. E., (0000-0001-6994-2475) Garten, M., (0000-0002-8258-3881) Bussmann, M., (0000-0003-4861-5584) Kluge, T., (0009-0005-6873-8292) Marre, B. E., (0000-0001-6994-2475) Garten, M., (0000-0002-8258-3881) Bussmann, M., and (0000-0003-4861-5584) Kluge, T.
Abstract: Simulations allow us to get a detailed understanding of processes inside plasmas not directly accessible to experiments. They are therefore a very important tool for theoretical and experimental research and are continually being improved. One improvement in development is the direct inclusion of atomic physics in Particle in Cell(PIC) simulations, a specific simulation technic used for non fluid-like plasmas. In this talk I will describe possible approaches to realise atomic physics in PIC and give a short introduction to PIC algorithms and atomic physics in plasmas.
Published: 2020

70. Pedal to the Metal: Designing a Scalable Particle-in-Cell Code PIConGPU

Author: (0000-0003-3396-6154) Bastrakov, S., (0000-0003-1642-0459) Widera, R., (0000-0002-3844-3697) Debus, A., (0000-0001-6994-2475) Garten, M., (0000-0001-7990-9564) Pausch, R., (0000-0001-8965-1149) Steiniger, K., (0000-0003-1943-7141) Hübl, A., (0000-0002-8258-3881) Bussmann, M., (0000-0003-3396-6154) Bastrakov, S., (0000-0003-1642-0459) Widera, R., (0000-0002-3844-3697) Debus, A., (0000-0001-6994-2475) Garten, M., (0000-0001-7990-9564) Pausch, R., (0000-0001-8965-1149) Steiniger, K., (0000-0003-1943-7141) Hübl, A., and (0000-0002-8258-3881) Bussmann, M.
Abstract: PIConGPU is an open-source Particle-in-Cell simulation code for the Exascale era. It implements a wide range of core Particle-in-Cell numerical schemes and extensions, in-situ diagnostics, and high-performance I/O. With a single source code base, PIConGPU runs on a variety of modern hardware, including both CPUs and GPUs, and scales from a single workstation up to the largest supercomputers. Following up the two recent talks concerning physical and numerical features of PIConGPU, this talk will focus on the computer science and software design aspects of the code and the underlying software stack. The talk concerns PIConGPU core data structures, typical patterns of parallel processing, and software design approach to enable efficient and scalable single-source implementation. It also presents performance and scaling results on the Summit supercomputer.
Published: 2020

71. Experimental control of laser proton acceleration beyond 50 MeV

Author: (0000-0002-3727-7017) Ziegler, T., Bernert, C., (0000-0002-1919-8585) Bock, S., (0000-0002-9859-2408) Brack, F.-E., (0000-0002-5845-000X) Cowan, T., (0000-0001-6994-2475) Garten, M., Gaus, L., Gebhardt, R., Helbig, U., (0000-0002-4626-0049) Irman, A., (0000-0002-4862-6569) Kiriyama, H., (0000-0003-4861-5584) Kluge, T., (0000-0002-0638-6990) Kraft, S., (0000-0002-0275-9892) Kroll, F., (0000-0002-9556-0662) Metzkes-Ng, J., (0000-0001-8143-0827) Nishiuchi, M., (0000-0001-9236-8037) Obst-Hübl, L., Püschel, T., (0000-0001-6200-6406) Rehwald, M., (0000-0003-4400-1315) Schlenvoigt, H.-P., (0000-0003-0390-7671) Schramm, U., (0000-0003-3926-409X) Zeil, K., (0000-0002-3727-7017) Ziegler, T., Bernert, C., (0000-0002-1919-8585) Bock, S., (0000-0002-9859-2408) Brack, F.-E., (0000-0002-5845-000X) Cowan, T., (0000-0001-6994-2475) Garten, M., Gaus, L., Gebhardt, R., Helbig, U., (0000-0002-4626-0049) Irman, A., (0000-0002-4862-6569) Kiriyama, H., (0000-0003-4861-5584) Kluge, T., (0000-0002-0638-6990) Kraft, S., (0000-0002-0275-9892) Kroll, F., (0000-0002-9556-0662) Metzkes-Ng, J., (0000-0001-8143-0827) Nishiuchi, M., (0000-0001-9236-8037) Obst-Hübl, L., Püschel, T., (0000-0001-6200-6406) Rehwald, M., (0000-0003-4400-1315) Schlenvoigt, H.-P., (0000-0003-0390-7671) Schramm, U., and (0000-0003-3926-409X) Zeil, K.
Abstract: We report on the ongoing plasma accelerator development at the HZDR, moving from plasma-acceleration studies towards real plasma-accelerators that can be controlled and applied in the lab. We show experimental investigations of proton acceleration from laser-irradiated solid foils with the DRACO PW laser, where highest proton cut-off energies were achieved for temporal pulse shape parameters well different from that of a Fourier transform limited (FTL) pulse. Controlled spectral phase modulation of the driver laser by means of an acousto-optic programmable dispersive filter enabled us to manipulate the temporal laser pulse shape and to study the effect on proton acceleration from thin foil targets. The results show that short and asymmetric pulses generated by positive third order dispersion values are favourable for proton acceleration and can lead to maximum energies of 60 MeV for thin plastic foils. Assuming appropriate control of the spectral phase of the laser and comparable temporal contrast conditions, we believe that the presented method can be universally applied to improve the proton acceleration performance using any other laser system operated in the PW regime.
Published: 2020

72. 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

73. ComputationalRadiationPhysics/picongpu: Perfectly Matched Layer (PML) and Bug Fixes

Author: (0000-0003-1943-7141) Hübl, A., (0000-0003-1642-0459) Widera, R., Worpitz, B., (0000-0001-7990-9564) Pausch, R., Burau, H., (0000-0001-6994-2475) Garten, M., (0000-0001-5007-1868) Starke, S., Grund, A., (0000-0002-3844-3697) Debus, A., (0000-0002-6702-2015) Matthes, A., (0000-0003-3396-6154) Bastrakov, S., (0000-0001-8965-1149) Steiniger, K., Göthel, I., Rudat, S., (0000-0003-1761-2591) Kelling, J., (0000-0002-8258-3881) Bussmann, M., (0000-0003-1943-7141) Hübl, A., (0000-0003-1642-0459) Widera, R., Worpitz, B., (0000-0001-7990-9564) Pausch, R., Burau, H., (0000-0001-6994-2475) Garten, M., (0000-0001-5007-1868) Starke, S., Grund, A., (0000-0002-3844-3697) Debus, A., (0000-0002-6702-2015) Matthes, A., (0000-0003-3396-6154) Bastrakov, S., (0000-0001-8965-1149) Steiniger, K., Göthel, I., Rudat, S., (0000-0003-1761-2591) Kelling, J., and (0000-0002-8258-3881) Bussmann, M.
Abstract: This release adds a new field absorber for the Yee solver, convolutional perfectly matched layer (PML). Compared to the still supported exponential damping absorber, PML provides better absorption rate and much less spurious reflections. We added new plugins for computing emittance and transition radiation, particle rendering with the ISAAC plugin, Python tools for reading and visualizing output of a few plugins. The release also adds a few quality-of-life features, including a new memory calculator, better command-line experience with new options and bash-completion, improved error handling, cleanup of the example setups, and extensions to documentation. Please refer to our ChangeLog for a full list of features, fixes and user interface changes before getting started. Thanks to Igor Andriyash, Sergei Bastrakov, Xeinia Bastrakova, Andrei Berceanu, Finn-Ole Carstens, Alexander Debus, Jian Fuh Ong, Marco Garten, Axel Huebl, Sophie Rudat (Koßagk), Anton Lebedev, Felix Meyer, Pawel Ordyna, Richard Pausch, Franz Pöschel, Adam Simpson, Sebastian Starke, Klaus Steiniger, René Widera for contributions to this release!
Published: 2020

74. Approaching predictive capabilities for LWFA experiments with PIConGPU

Author: (0000-0001-7990-9564) Pausch, R., (0000-0001-9129-4208) Couperus Cabadağ, J. P., (0000-0001-6994-2475) Garten, M., (0000-0003-1943-7141) Hübl, A., (0000-0001-9759-1166) Köhler, A., (0000-0003-0340-9963) Kurz, T., Schöbel, S., (0000-0003-0390-7671) Schramm, U., (0000-0001-8965-1149) Steiniger, K., (0000-0003-1642-0459) Widera, R., (0000-0003-4362-3438) Zarini, O., (0000-0002-4626-0049) Irman, A., (0000-0002-8258-3881) Bussmann, M., (0000-0002-3844-3697) Debus, A., (0000-0001-7990-9564) Pausch, R., (0000-0001-9129-4208) Couperus Cabadağ, J. P., (0000-0001-6994-2475) Garten, M., (0000-0003-1943-7141) Hübl, A., (0000-0001-9759-1166) Köhler, A., (0000-0003-0340-9963) Kurz, T., Schöbel, S., (0000-0003-0390-7671) Schramm, U., (0000-0001-8965-1149) Steiniger, K., (0000-0003-1642-0459) Widera, R., (0000-0003-4362-3438) Zarini, O., (0000-0002-4626-0049) Irman, A., (0000-0002-8258-3881) Bussmann, M., and (0000-0002-3844-3697) Debus, A.
Abstract: State-of-the-art particle-in-cell simulations are becoming faster in terms of time to solution by utilizing modern hardware accelerators like GPUs and more accurate by improving the underlying algorithms. However, in order to model experiments, methods to include realistic laser pulses and gas distributions as well as efficient techniques to predict experimental observables, so-called synthetic diagnostics, need to be included in these simulations. In this talk, we present extensions to the particle-in-cell code PIConGPU that were essential to accurately model LWFA experiments based on self-truncated ionization injection performed at HZDR. We discuss the significant impact of the implementation of higher order laser modes on the plasma dynamics and the resulting acceleration process. Furthermore, we discuss in detail the advantage of efficient in situ data analysis on the example of studying electron phase space evolution and of predicting spectrally and directionally radiation emission by all particles. These improvements set the stage for quantitatively predicting the results of experiments in the near future.
Published: 2019

75. Large-scale simulations of plasma acceleration

Author: (0000-0001-7990-9564) Pausch, R., (0000-0003-1943-7141) Hübl, A., (0000-0003-3396-6154) Bastrakov, S., (0000-0002-3844-3697) Debus, A., (0000-0001-6994-2475) Garten, M., (0000-0002-6702-2015) Matthes, A., (0000-0001-8965-1149) Steiniger, K., (0000-0003-0390-7671) Schramm, U., (0000-0003-1642-0459) Widera, R., Zenker, E., (0000-0002-8258-3881) Bussmann, M., (0000-0001-7990-9564) Pausch, R., (0000-0003-1943-7141) Hübl, A., (0000-0003-3396-6154) Bastrakov, S., (0000-0002-3844-3697) Debus, A., (0000-0001-6994-2475) Garten, M., (0000-0002-6702-2015) Matthes, A., (0000-0001-8965-1149) Steiniger, K., (0000-0003-0390-7671) Schramm, U., (0000-0003-1642-0459) Widera, R., Zenker, E., and (0000-0002-8258-3881) Bussmann, M.
Abstract: A brief presentation of the MuT/DMA activities of the Computational radiation group and solutions that might be of interest for the Matter in the Universe community.
Published: 2019

76. Start-to-end simulations of L|PWFA hybrid accelerator experiments using PIConGPU

Author: (0000-0001-7990-9564) Pausch, R., (0000-0002-3844-3697) Debus, A., (0000-0001-8965-1149) Steiniger, K., (0000-0001-6994-2475) Garten, M., (0000-0003-1943-7141) Hübl, A., (0000-0003-1642-0459) Widera, R., (0000-0003-0340-9963) Kurz, T., Schöbel, S., (0000-0001-9129-4208) Couperus Cabadağ, J. P., Chang, Y.-Y., (0000-0001-9759-1166) Köhler, A., (0000-0003-4362-3438) Zarini, O., Heinemann, T., Gilljohann, M. F., Ding, H., Götzfried, J., Döpp, A., Kononenko, O., Raj, G., Martines De La Ossa, A., Assmann, R., Hidding, B., Karsch, S., Code, S., (0000-0002-4626-0049) Irman, A., (0000-0003-0390-7671) Schramm, U., (0000-0002-8258-3881) Bussmann, M., (0000-0001-7990-9564) Pausch, R., (0000-0002-3844-3697) Debus, A., (0000-0001-8965-1149) Steiniger, K., (0000-0001-6994-2475) Garten, M., (0000-0003-1943-7141) Hübl, A., (0000-0003-1642-0459) Widera, R., (0000-0003-0340-9963) Kurz, T., Schöbel, S., (0000-0001-9129-4208) Couperus Cabadağ, J. P., Chang, Y.-Y., (0000-0001-9759-1166) Köhler, A., (0000-0003-4362-3438) Zarini, O., Heinemann, T., Gilljohann, M. F., Ding, H., Götzfried, J., Döpp, A., Kononenko, O., Raj, G., Martines De La Ossa, A., Assmann, R., Hidding, B., Karsch, S., Code, S., (0000-0002-4626-0049) Irman, A., (0000-0003-0390-7671) Schramm, U., and (0000-0002-8258-3881) Bussmann, M.
Abstract: The poster gives an overview of the LPWFA experimental setup and explains in detail the accompanying simulation campaign.
Published: 2019

77. Modeling and understanding the dynamics of relativistic plasmas with particle-in-cell simulations

Author: (0000-0003-3396-6154) Bastrakov, S., (0000-0002-8258-3881) Bussmann, M., (0000-0002-3844-3697) Debus, A., (0000-0001-6994-2475) Garten, M., (0000-0003-1943-7141) Hübl, A., (0000-0002-6702-2015) Matthes, A., (0000-0001-7990-9564) Pausch, R., (0000-0003-1642-0459) Widera, R., Starke, S., (0000-0001-8965-1149) Steiniger, K., (0000-0003-3396-6154) Bastrakov, S., (0000-0002-8258-3881) Bussmann, M., (0000-0002-3844-3697) Debus, A., (0000-0001-6994-2475) Garten, M., (0000-0003-1943-7141) Hübl, A., (0000-0002-6702-2015) Matthes, A., (0000-0001-7990-9564) Pausch, R., (0000-0003-1642-0459) Widera, R., Starke, S., and (0000-0001-8965-1149) Steiniger, K.
Published: 2019

78. Modeling hybrid plasma accelerator experiments with PIConGPU

Author: (0000-0001-7990-9564) Pausch, R., (0000-0002-8258-3881) Bussmann, 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., Schöbel, S., 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., Kononeko, O., Raj, G., Corde, S., Hidding, B., Karsch, S., 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., (0000-0002-8258-3881) Bussmann, 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., Schöbel, S., 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., Kononeko, O., Raj, G., Corde, S., Hidding, B., Karsch, S., 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: Utilizing laser-wakefield accelerated (LWFA) electrons to drive aplasma-wakefield accelerator (PWFA) holds great promise for realizingcentimeter-scale electron accelerators providing ultra-high brightnessbeams. Recent experiments at HZDR could demonstrate for the first timesuch an electron acceleration in a nonlinear PWFA plasma wakefield. Fordriving this compact hybrid accelerator setup, high-charge electronbunches from LWFA self-truncated ionization injection were used.In this talk, we present recent results of the accompanying simulationcampaign performed with the 3D3V particle-in-cell code PIConGPU. Thesesimulations model the geometry, density distributions, laser modes, andgas dopings as determined in the experiments. The simulation conditionsresemble the experiment to a very high degree and thus provide goodcomparability between experiment and simulation. Additionally, thewealth of information provided by the in-situ data analysis of PIConGPU provides insight into the plasma dynamics, otherwise inaccessible inexperiments.From an algorithmic and computational perspective, we modeled the hybridaccelerator from start to end in a single simulation scenario. Wediscuss the associated challenges in maintaining numerical stability andexperimental comparability of these long-duration simulations.
Published: 2019

79. Hybrid plasma accelerators - LWFA-PWFA simulations with PIConGPU

Author: (0000-0001-7990-9564) Pausch, R., (0000-0002-3844-3697) Debus, A., (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., 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., (0000-0001-7990-9564) Pausch, R., (0000-0002-3844-3697) Debus, A., (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., 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: Utilizing laser-wakefield accelerated (LWFA) electrons to drive a plasma-wakefield accelerator (PWFA) holds great promise for realizing centimeter-scale electron accelerators providing ultra-high brightness beams. Recent experiments at HZDR could demonstrate for the first time such an electron acceleration in a nonlinear PWFA plasma wakefield using this compact setup. On this poster, we show recent results of the accompanying simulation campaign performed with the 3D3V particle-in-cell code PIConGPU. These simulations model the geometry, density distributions, laser modes, and gas dopings as determined in the experiments. The simulation conditions resemble the experiment to a very high degree and thus provide precise comparability between experiment and simulation. Additionally, the wealth of information provided by the in-situ data analysis of PIConGPU provides insight into the plasma dynamic, otherwise inaccessible in experiments. Algorithmic and computational challenges essential for the numerical stability of these long-duration simulations will be presented as well.
Published: 2019

80. Ion acceleration from ultra-thin foil targets with on-shot monitored temporal contrast

Author: (0000-0002-3727-7017) Ziegler, T., Bernert, C., (0000-0002-9859-2408) Brack, F.-E., (0000-0002-8258-3881) Bussmann, M., (0000-0002-5845-000X) Cowan, T., (0000-0001-6994-2475) Garten, M., (0000-0003-4861-5584) Kluge, T., (0000-0002-0638-6990) Kraft, S., (0000-0002-0275-9892) Kroll, F., (0000-0002-9556-0662) Metzkes-Ng, J., (0000-0001-9236-8037) Obst-Hübl, L., (0000-0001-6200-6406) Rehwald, M., (0000-0003-4400-1315) Schlenvoigt, H.-P., (0000-0003-0390-7671) Schramm, U., Zeil, K., (0000-0002-3727-7017) Ziegler, T., Bernert, C., (0000-0002-9859-2408) Brack, F.-E., (0000-0002-8258-3881) Bussmann, M., (0000-0002-5845-000X) Cowan, T., (0000-0001-6994-2475) Garten, M., (0000-0003-4861-5584) Kluge, T., (0000-0002-0638-6990) Kraft, S., (0000-0002-0275-9892) Kroll, F., (0000-0002-9556-0662) Metzkes-Ng, J., (0000-0001-9236-8037) Obst-Hübl, L., (0000-0001-6200-6406) Rehwald, M., (0000-0003-4400-1315) Schlenvoigt, H.-P., (0000-0003-0390-7671) Schramm, U., and Zeil, K.
Abstract: Laser-driven ion acceleration promises to provide a compact solution for demanding applications like particle therapy, proton radiography or inertial confinement research. Controlling the particle beam parameters to achieve these goals is currently pushing the frontier of laser driven particle accelerators. The performance of the plasma acceleration is strongly dependent on the complex pre-plasma formation process at the target front surface which is determined by the temporal intensity contrast. Particularly low-density targets require an enhanced temporal contrast to remain overcritical until the main pulse arrives. Plasma mirror setups have proven to significantly improve the temporal contrast by reducing pre-pulse intensity and steepening the rising edge of the main laser pulse, enabling the investigation of laser proton acceleration and proton energy scaling using ultra-thin targets. We present new experimental results on the interaction of the DRACO Petawatt ultra-short pulse laser with ultra-thin foil targets. Efficient and on-demand contrast cleaning established through a re-collimating plasma mirror setup facilitated thickness scans from the µm range down to several tens of nm. The combination of a complex set of diagnostics, consisting of proton detectors in target normal, laser forward and laser backward axis, laser pulse transmission and reflection diagnostics as well as detection of front surface electrons, delivered concrete indicators for the acceleration conditions. Furthermore, tremendous progress has been achieved by successfully implementing a novel laser contrast diagnostic by means of self-referenced spectral interferometry with extended time excursion (SRSI-ETE), allowing to characterize the temporal contrast in the experimental area on a single-shot base with unprecedented dynamic and temporal range.
Published: 2019

81. Scalable particle-in-cell simulations on many-core hardware with the free and open source code PIConGPU

Author: (0000-0001-8965-1149) Steiniger, K., (0000-0003-3396-6154) Bastrakov, S., (0000-0002-5845-000X) Cowan, T., (0000-0002-3844-3697) Debus, A., (0000-0001-6994-2475) Garten, M., Göthel, I., (0000-0003-1943-7141) Hübl, A., (0000-0002-9935-4428) Juckeland, G., Kelling, J., (0000-0003-4861-5584) Kluge, T., Koßagk, S., (0000-0002-6702-2015) Matthes, A., (0000-0001-7990-9564) Pausch, R., (0000-0003-0390-7671) Schramm, U., Starke, S., (0000-0003-1642-0459) Widera, R., Worpitz, B., (0000-0002-8258-3881) Bussmann, M., (0000-0001-8965-1149) Steiniger, K., (0000-0003-3396-6154) Bastrakov, S., (0000-0002-5845-000X) Cowan, T., (0000-0002-3844-3697) Debus, A., (0000-0001-6994-2475) Garten, M., Göthel, I., (0000-0003-1943-7141) Hübl, A., (0000-0002-9935-4428) Juckeland, G., Kelling, J., (0000-0003-4861-5584) Kluge, T., Koßagk, S., (0000-0002-6702-2015) Matthes, A., (0000-0001-7990-9564) Pausch, R., (0000-0003-0390-7671) Schramm, U., Starke, S., (0000-0003-1642-0459) Widera, R., Worpitz, B., and (0000-0002-8258-3881) Bussmann, M.
Abstract: Exploring new regimes, optimizing experimental setups, or quantifying sensitivity of final beam parameters on experimental parameters, represent current challenges for simulations of laser plasma accelerators. Time-to-solution and scalability are key parameters for codes to minimize turnaround times in order to scan e.g. tens of parameters such as the laser leading edge, resolve solid density target physics and run full-scale start-to-end simulations. PIConGPU reaches unprecedented performance by accelerating 100% of its computations on many-core architectures and leveraging next-generation scalable I/O. High-resolution, full-geometry studies on top-ten listed supercomputers decisively enhance predictive capabilities. PIConGPU's design allows for utilizing various compute architectures, including modern X86 and ARM CPUs and GPUs with a single, adaptable code base. Users can now run PIConGPU on almost any machine, either by easy recompiling or using predefined Docker images, and everybody can download, use and contribute to the code without extensive knowledge in compute architectures. We highlight latest additions to PIConGPU such as scalable file I/O via a new openPMD-API including ADIOS2 support for on the fly loosely coupled data analysis, live visualization with particle and field rendering, non-standard Gaussian laser pulses via Laguerre modes, in-situ X-ray scattering image generation, and an pythonic simulation setup interface.
Published: 2019

82. Spectral Control via Multi-Species Effects in PW-Class Laser-Ion Acceleration

Author: (0000-0003-1943-7141) Huebl, A., (0000-0001-6200-6406) Rehwald, M., (0000-0001-9236-8037) Obst-Huebl, L., (0000-0002-3727-7017) Ziegler, T., (0000-0001-6994-2475) Garten, M., (0000-0003-1642-0459) Widera, R., Zeil, K., (0000-0002-5845-000X) Cowan, T. E., (0000-0002-8258-3881) Bussmann, M., (0000-0003-0390-7671) Schramm, U., (0000-0003-4861-5584) Kluge, T., (0000-0003-1943-7141) Huebl, A., (0000-0001-6200-6406) Rehwald, M., (0000-0001-9236-8037) Obst-Huebl, L., (0000-0002-3727-7017) Ziegler, T., (0000-0001-6994-2475) Garten, M., (0000-0003-1642-0459) Widera, R., Zeil, K., (0000-0002-5845-000X) Cowan, T. E., (0000-0002-8258-3881) Bussmann, M., (0000-0003-0390-7671) Schramm, U., and (0000-0003-4861-5584) Kluge, T.
Abstract: Laser-ion acceleration with ultra-short pulse, PW-class lasers is dominated by non-thermal, intra-pulse plasma dynamics. The presence of multiple ion species or multiple charge states in targets leads to characteristic modulations and even mono-energetic features, depending on the choice of target material. As spectral signatures of generated ion beams are frequently used to characterize underlying acceleration mechanisms, thermal, multi-fluid descriptions require a revision for predictive capabilities and control in next-generation particle beam sources. We present an analytical model with explicit inter-species interactions, supported by extensive ab initio simulations. This enables us to derive important ensemble properties from the spectral distribution resulting from those multi-species effects for arbitrary mixtures. We further propose a potential experimental implementation with a novel cryogenic target, delivering jets with variable mixtures of hydrogen and deuterium. Free from contaminants and without strong influence of hardly controllable processes such as ionization dynamics, this would allow a systematic realization of our predictions for the multi-species effect.
Published: 2019

83. Enhanced ion acceleration from a non-ideal laser pulse contrast

Author: (0000-0001-6994-2475) Garten, M., Huebl, A., (0000-0003-1642-0459) Widera, R., Göthel, I., Obst-Huebl, L., (0000-0002-3727-7017) Ziegler, T., Zeil, K., (0000-0002-5845-000X) Cowan, T., (0000-0003-0390-7671) Schramm, U., (0000-0002-8258-3881) Bussmann, M., (0000-0003-4861-5584) Kluge, T., (0000-0001-6994-2475) Garten, M., Huebl, A., (0000-0003-1642-0459) Widera, R., Göthel, I., Obst-Huebl, L., (0000-0002-3727-7017) Ziegler, T., Zeil, K., (0000-0002-5845-000X) Cowan, T., (0000-0003-0390-7671) Schramm, U., (0000-0002-8258-3881) Bussmann, M., and (0000-0003-4861-5584) Kluge, T.
Abstract: The major challenges of compact proton sources driven by an ultrashort high-intensity laser are currently to establish precise control over proton beam parameters and shot-to-shot stability. Shooting ultrathin targets has shown to yield higher proton energies, which became recently accessible due to temporal laser pulse shape control using plasma-mirror techniques. We find that the intensity ramp, transmitted to the target by the plasma mirror during the last picosecond before the pulse peak, becomes significantly decisive for the subsequent acceleration performance. Reliable characterization of this ramp with modern laser diagnostics remains challenging and immense computational needs required to fully resolve the plasma kinetics leave it mostly unexplored in today's simulations of laser-solid interaction. We present the results of 3D large-scale simulations with PIConGPU, taking into account realistic contrast conditions, bridging the scales from picosecond pre-plasma formation over transient, non-equilibrium dynamics of the tens of femtosecond laser duration down to attosecond plasma oscillations. Adding to beneficial acceleration conditions presented by hybrid acceleration mechanisms and the onset of relativistic transparency, we show that the maximum proton energy can be optimized by a specific leading pulse edge via a combination of pre-thermal and thermal TNSA, surpassing the performance of the ideal diffraction-limited Gaussian pulse.
Published: 2019

84. Enhanced ion acceleration from a non-ideal laser pulse contrast

Author: (0000-0001-6994-2475) Garten, M., Huebl, A., (0000-0003-1642-0459) Widera, R., Göthel, I., Obst-Huebl, L., (0000-0002-3727-7017) Ziegler, T., Zeil, K., (0000-0002-5845-000X) Cowan, T., (0000-0003-0390-7671) Schramm, U., (0000-0002-8258-3881) Bussmann, M., (0000-0003-4861-5584) Kluge, T., (0000-0001-6994-2475) Garten, M., Huebl, A., (0000-0003-1642-0459) Widera, R., Göthel, I., Obst-Huebl, L., (0000-0002-3727-7017) Ziegler, T., Zeil, K., (0000-0002-5845-000X) Cowan, T., (0000-0003-0390-7671) Schramm, U., (0000-0002-8258-3881) Bussmann, M., and (0000-0003-4861-5584) Kluge, T.
Abstract: The major challenges of compact proton sources driven by an ultrashort high-intensity laser are currently to establish precise control over proton beam parameters and shot-to-shot stability. Shooting ultrathin targets has shown to yield higher proton energies, which became recently accessible due to temporal laser pulse shape control using plasma-mirror techniques. We find that the intensity ramp, transmitted to the target by the plasma mirror during the last picosecond before the pulse peak, becomes significantly decisive for the subsequent acceleration performance. Reliable characterization of this ramp with modern laser diagnostics remains challenging and immense computational needs required to fully resolve the plasma kinetics leave it mostly unexplored in today's simulations of laser-solid interaction. We present the results of 3D large-scale simulations with PIConGPU, taking into account realistic contrast conditions, bridging the scales from picosecond pre-plasma formation over transient, non-equilibrium dynamics of the tens of femtosecond laser duration down to attosecond plasma oscillations. Adding to beneficial acceleration conditions presented by hybrid acceleration mechanisms and the onset of relativistic transparency, we show that the maximum proton energy can be optimized by a specific leading pulse edge via a combination of pre-thermal and thermal TNSA, surpassing the performance of the ideal diffraction-limited Gaussian pulse.
Published: 2019

85. All-optical shaping of laser-driven proton beam profiles

Author: (0000-0002-3727-7017) Ziegler, T., (0000-0001-9236-8037) Obst-Huebl, L., Brack, F.-E., Branco, J., (0000-0002-8258-3881) Bussmann, M., (0000-0002-5845-000X) Cowan, T. E., (0000-0001-8756-181X) Curry, C. B., (0000-0002-8502-5535) Fiuza, F., (0000-0001-6994-2475) Garten, M., (0000-0001-6608-9325) Gauthier, M., Göde, S., Glenzer, S. H., (0000-0003-1943-7141) Huebl, A., Irman, A., Kim, J. B., (0000-0003-4861-5584) Kluge, T., (0000-0002-0638-6990) Kraft, S., (0000-0002-0275-9892) Kroll, F., (0000-0002-9556-0662) Metzkes-Ng, J., (0000-0001-7990-9564) Pausch, R., Prencipe, I., (0000-0001-6200-6406) Rehwald, M., Rödel, C., (0000-0003-4400-1315) Schlenvoigt, H.-P., (0000-0003-0390-7671) Schramm, U., Zeil, K., (0000-0002-3727-7017) Ziegler, T., (0000-0001-9236-8037) Obst-Huebl, L., Brack, F.-E., Branco, J., (0000-0002-8258-3881) Bussmann, M., (0000-0002-5845-000X) Cowan, T. E., (0000-0001-8756-181X) Curry, C. B., (0000-0002-8502-5535) Fiuza, F., (0000-0001-6994-2475) Garten, M., (0000-0001-6608-9325) Gauthier, M., Göde, S., Glenzer, S. H., (0000-0003-1943-7141) Huebl, A., Irman, A., Kim, J. B., (0000-0003-4861-5584) Kluge, T., (0000-0002-0638-6990) Kraft, S., (0000-0002-0275-9892) Kroll, F., (0000-0002-9556-0662) Metzkes-Ng, J., (0000-0001-7990-9564) Pausch, R., Prencipe, I., (0000-0001-6200-6406) Rehwald, M., Rödel, C., (0000-0003-4400-1315) Schlenvoigt, H.-P., (0000-0003-0390-7671) Schramm, U., and Zeil, K.
Abstract: Extreme field gradients intrinsic to relativistic laser plasma interactions enable compact MeV proton accelerators with unique bunch characteristics, yet complicate direct proton beam control. Only complex micro-engineering of the plasma accelerator itself and limited adoption of conventional beam optics, so far provided access to global beam parameters as direction and divergence. Here we present a novel, counter-intuitive, yet readily applicable all-optical approach to imprint detailed spatial information from the driving laser pulse to the proton bunch. In a series of experiments, the spatial profile of the energetic proton bunch was found to exhibit identical features as the fraction of the laser pulse passing around a target of limited size. The formation of quasi-static electric fields in the beam path by ionization of residual gas in the experimental chamber results in asynchronous information transfer between the laser pulse and the naturally delayed proton bunch. Essentially acting as a programmable memory, these fields provide access to a new level of proton beam manipulation.
Published: 2019

86. Enhanced ion acceleration from a non-ideal laser pulse contrast

Author: (0000-0001-6994-2475) Garten, M., Huebl, A., (0000-0003-1642-0459) Widera, R., Göthel, I., Obst-Huebl, L., (0000-0002-3727-7017) Ziegler, T., (0000-0003-3926-409X) Zeil, K., (0000-0002-5845-000X) Cowan, T., (0000-0003-0390-7671) Schramm, U., (0000-0002-8258-3881) Bussmann, M., (0000-0003-4861-5584) Kluge, T., (0000-0001-6994-2475) Garten, M., Huebl, A., (0000-0003-1642-0459) Widera, R., Göthel, I., Obst-Huebl, L., (0000-0002-3727-7017) Ziegler, T., (0000-0003-3926-409X) Zeil, K., (0000-0002-5845-000X) Cowan, T., (0000-0003-0390-7671) Schramm, U., (0000-0002-8258-3881) Bussmann, M., and (0000-0003-4861-5584) Kluge, T.
Abstract: The major challenges of compact proton sources driven by an ultrashort high-intensity laser are currently to establish precise control over proton beam parameters and shot-to-shot stability. Shooting ultrathin targets has shown to yield higher proton energies, which became recently accessible due to temporal laser pulse shape control using plasma-mirror techniques. We find that the intensity ramp, transmitted to the target by the plasma mirror during the last picosecond before the pulse peak, becomes significantly decisive for the subsequent acceleration performance. Reliable characterization of this ramp with modern laser diagnostics remains challenging and immense computational needs required to fully resolve the plasma kinetics leave it mostly unexplored in today's simulations of laser-solid interaction. We present the results of 3D large-scale simulations with PIConGPU, taking into account realistic contrast conditions, bridging the scales from picosecond pre-plasma formation over transient, non-equilibrium dynamics of the tens of femtosecond laser duration down to attosecond plasma oscillations. Adding to beneficial acceleration conditions presented by hybrid acceleration mechanisms and the onset of relativistic transparency, we show that the maximum proton energy can be optimized by a specific leading pulse edge via a combination of pre-thermal and thermal TNSA, surpassing the performance of the ideal diffraction-limited Gaussian pulse.
Published: 2019

87. Laser-driven proton beam profiles in ultra-high fields

Author: (0000-0001-9236-8037) Obst-Hübl, L., (0000-0003-1739-0159) Bernert, C., (0000-0002-9859-2408) Brack, F.-E., Branco, J., (0000-0002-8258-3881) Bussmann, M., Cochran, G., (0000-0002-5845-000X) Cowan, T., Curry, C. B., (0000-0002-6914-4083) Gaus, L., Fiuza, F., (0000-0001-6994-2475) Garten, M., Gauthier, M., Glenzer, S. H., Göde, S., (0000-0003-1943-7141) Hübl, A., (0000-0002-4626-0049) Irman, A., Kim, J. B., (0000-0003-4861-5584) Kluge, T., (0000-0002-0638-6990) Kraft, S., (0000-0002-0275-9892) Kroll, F., Macdonald, M. J., (0000-0002-9556-0662) Metzkes-Ng, J., Mishra, R., (0000-0001-7990-9564) Pausch, R., Poole, P., (0000-0003-0931-1350) Prencipe, I., (0000-0001-6200-6406) Rehwald, M., Rödel, C., Ruyer, C., (0000-0003-4400-1315) Schlenvoigt, H.-P., Sommer, P., Schoenwalder, C., Schumaker, W., (0000-0002-3727-7017) Ziegler, T., (0000-0003-0390-7671) Schramm, U., Schumacher, D. W., (0000-0003-3926-409X) Zeil, K., (0000-0001-9236-8037) Obst-Hübl, L., (0000-0003-1739-0159) Bernert, C., (0000-0002-9859-2408) Brack, F.-E., Branco, J., (0000-0002-8258-3881) Bussmann, M., Cochran, G., (0000-0002-5845-000X) Cowan, T., Curry, C. B., (0000-0002-6914-4083) Gaus, L., Fiuza, F., (0000-0001-6994-2475) Garten, M., Gauthier, M., Glenzer, S. H., Göde, S., (0000-0003-1943-7141) Hübl, A., (0000-0002-4626-0049) Irman, A., Kim, J. B., (0000-0003-4861-5584) Kluge, T., (0000-0002-0638-6990) Kraft, S., (0000-0002-0275-9892) Kroll, F., Macdonald, M. J., (0000-0002-9556-0662) Metzkes-Ng, J., Mishra, R., (0000-0001-7990-9564) Pausch, R., Poole, P., (0000-0003-0931-1350) Prencipe, I., (0000-0001-6200-6406) Rehwald, M., Rödel, C., Ruyer, C., (0000-0003-4400-1315) Schlenvoigt, H.-P., Sommer, P., Schoenwalder, C., Schumaker, W., (0000-0002-3727-7017) Ziegler, T., (0000-0003-0390-7671) Schramm, U., Schumacher, D. W., and (0000-0003-3926-409X) Zeil, K.
Abstract: Extreme field gradients intrinsic to relativistic laser-interactions with thin solid targets enable compact multi-MeV proton accelerators with unique bunch characteristics. Protons are accelerated in TV/m fields that are established within the micrometer-scale vicinity of the high-power laser focus. This initial acceleration phase is followed by ballistic proton bunch propagation with negligible space-charge effects over millimeters to hundreds of centimeters to the particle detector or a proton target at a dedicated irradiation site. The detected proton emission distribution can be influenced by the spatio-temporal intensity distribution in the laser focus, electron transport through the target, potential plasma instabilities, as well as local and global target geometry and surface properties. Substantially extending this picture, our recent results show a critical influence of the milimeter scale vacuum environment on the accelerated proton bunch, where residual gas molecules are ionized by the remnant laser light that is not absorbed into the target plasma but reflected or transmitted. In an experiment with µm-sized hydrogen jet targets, this effect lead to the counter-intuitive observation of laser near-field feature imprints in the detected proton beam profiles. Our results show that the remnant laser pulse induces a quasi-static deflecting field map in the ionized residual background gas that serves as a memorizing medium and allows for asynchronous information transfer to the naturally delayed proton bunch. Occurring under typical experimental laser, target and vacuum conditions, all-optical imprinting needs to be taken into account for sensible interpretation of modulated proton beam profiles.
Published: 2019

88. Current status of the L|PWFA start-to-end simulations using PIConGPU

Author: (0000-0001-7990-9564) Pausch, R., (0000-0002-3844-3697) Debus, A., (0000-0001-8965-1149) Steiniger, K., (0000-0001-6994-2475) Garten, M., (0000-0003-1642-0459) Widera, R., (0000-0002-8258-3881) Bussmann, M., (0000-0001-7990-9564) Pausch, R., (0000-0002-3844-3697) Debus, A., (0000-0001-8965-1149) Steiniger, K., (0000-0001-6994-2475) Garten, M., (0000-0003-1642-0459) Widera, R., and (0000-0002-8258-3881) Bussmann, M.
Abstract: A summary of the LPWFA simulations of the last half year as performed within the hybrid collaboration.
Published: 2019

89. From studying the self-truncated ionization injection during LWFA to hybrid LPWFA simulations

Author: (0000-0001-7990-9564) Pausch, R., (0000-0002-3844-3697) Debus, A., (0000-0002-8258-3881) Bussmann, M., (0000-0001-9129-4208) Couperus Cabadağ, J. P., (0000-0001-6994-2475) Garten, M., Heinemann, T., (0000-0003-1943-7141) Hübl, A., Martinez De La Ossa, A., (0000-0002-4626-0049) Irman, A., (0000-0003-0340-9963) Kurz, T., (0000-0002-2769-4749) Schöbel, S., (0000-0001-8965-1149) Steiniger, K., (0000-0003-0390-7671) Schramm, U., (0000-0001-7990-9564) Pausch, R., (0000-0002-3844-3697) Debus, A., (0000-0002-8258-3881) Bussmann, M., (0000-0001-9129-4208) Couperus Cabadağ, J. P., (0000-0001-6994-2475) Garten, M., Heinemann, T., (0000-0003-1943-7141) Hübl, A., Martinez De La Ossa, A., (0000-0002-4626-0049) Irman, A., (0000-0003-0340-9963) Kurz, T., (0000-0002-2769-4749) Schöbel, S., (0000-0001-8965-1149) Steiniger, K., and (0000-0003-0390-7671) Schramm, U.
Abstract: This talk gives a brief summary of the current status of the start-to-end simulations of the hybrid LPWFA setup using PIConGPU.
Published: 2019

90. Hybrid plasma accelerators - LWFA-PWFA simulations with PIConGPU

Author: (0000-0001-7990-9564) Pausch, R., (0000-0002-3844-3697) Debus, A., (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., (0000-0001-9129-4208) Couperus Cabadağ, J. P., (0000-0002-4626-0049) Irman, A., (0000-0003-0390-7671) Schramm, U., (0000-0002-8258-3881) Bussmann, M., (0000-0001-7990-9564) Pausch, R., (0000-0002-3844-3697) Debus, A., (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., (0000-0001-9129-4208) Couperus Cabadağ, J. P., (0000-0002-4626-0049) Irman, A., (0000-0003-0390-7671) Schramm, U., and (0000-0002-8258-3881) Bussmann, M.
Abstract: Utilizing laser-wakefield accelerated (LWFA) electrons to drive a plasma-wakefield accelerator (PWFA) holds great promise for realizing centimeter-scale electron accelerators providing ultra-high brightness beams. Recent experiments at HZDR could demonstrate for the first time such an electron acceleration in a nonlinear PWFA plasma wakefield using this compact setup. On this poster, we show recent results of the accompanying simulation campaign performed with the 3D3V particle-in-cell code PIConGPU. These simulations model the geometry, density distributions, laser modes, and gas dopings as determined in the experiments. The simulation conditions resemble the experiment to a very high degree and thus provide precise comparability between experiment and simulation. Additionally, the wealth of information provided by the in-situ data analysis of PIConGPU provides insight into the plasma dynamic, otherwise inaccessible in experiments. Algorithmic and computational challenges essential for the numerical stability of these long-duration simulations will be presented as well.
Published: 2019

91. Modeling and understanding the dynamics of relativistic plasmas with particle-in-cell simulations

Author: (0000-0003-3396-6154) Bastrakov, S., (0000-0002-8258-3881) Bussmann, M., (0000-0002-3844-3697) Debus, A., (0000-0001-6994-2475) Garten, M., (0000-0003-1943-7141) Hübl, A., (0000-0002-6702-2015) Matthes, A., (0000-0001-7990-9564) Pausch, R., (0000-0003-1642-0459) Widera, R., (0000-0001-5007-1868) Starke, S., (0000-0001-8965-1149) Steiniger, K., (0000-0003-3396-6154) Bastrakov, S., (0000-0002-8258-3881) Bussmann, M., (0000-0002-3844-3697) Debus, A., (0000-0001-6994-2475) Garten, M., (0000-0003-1943-7141) Hübl, A., (0000-0002-6702-2015) Matthes, A., (0000-0001-7990-9564) Pausch, R., (0000-0003-1642-0459) Widera, R., (0000-0001-5007-1868) Starke, S., and (0000-0001-8965-1149) Steiniger, K.
Published: 2019

92. Spectral Control via Multi-Species Effects in PW-Class Laser-Ion Acceleration

Author: (0000-0003-1943-7141) Huebl, A., (0000-0001-6200-6406) Rehwald, M., (0000-0001-9236-8037) Obst-Huebl, L., (0000-0002-3727-7017) Ziegler, T., (0000-0001-6994-2475) Garten, M., (0000-0003-1642-0459) Widera, R., Zeil, K., (0000-0002-5845-000X) Cowan, T. E., (0000-0002-8258-3881) Bussmann, M., (0000-0003-0390-7671) Schramm, U., (0000-0003-4861-5584) Kluge, T., (0000-0003-1943-7141) Huebl, A., (0000-0001-6200-6406) Rehwald, M., (0000-0001-9236-8037) Obst-Huebl, L., (0000-0002-3727-7017) Ziegler, T., (0000-0001-6994-2475) Garten, M., (0000-0003-1642-0459) Widera, R., Zeil, K., (0000-0002-5845-000X) Cowan, T. E., (0000-0002-8258-3881) Bussmann, M., (0000-0003-0390-7671) Schramm, U., and (0000-0003-4861-5584) Kluge, T.
Abstract: Laser-ion acceleration with ultra-short pulse, PW-class lasers is dominated by non-thermal, intra-pulse plasma dynamics. The presence of multiple ion species or multiple charge states in targets leads to characteristic modulations and even mono-energetic features, depending on the choice of target material. As spectral signatures of generated ion beams are frequently used to characterize underlying acceleration mechanisms, thermal, multi-fluid descriptions require a revision for predictive capabilities and control in next-generation particle beam sources. We present an analytical model with explicit inter-species interactions, supported by extensive ab initio simulations. This enables us to derive important ensemble properties from the spectral distribution resulting from those multi-species effects for arbitrary mixtures. We further propose a potential experimental implementation with a novel cryogenic target, delivering jets with variable mixtures of hydrogen and deuterium. Free from contaminants and without strong influence of hardly controllable processes such as ionization dynamics, this would allow a systematic realization of our predictions for the multi-species effect.
Published: 2019

93. Start-to-end simulations of L|PWFA hybrid accelerator experiments using PIConGPU

Author: (0000-0001-7990-9564) Pausch, R., (0000-0002-3844-3697) Debus, A., (0000-0001-8965-1149) Steiniger, K., (0000-0001-6994-2475) Garten, M., (0000-0003-1943-7141) Hübl, A., (0000-0003-1642-0459) Widera, R., (0000-0003-0340-9963) Kurz, T., Schöbel, S., (0000-0001-9129-4208) Couperus Cabadağ, J. P., Chang, Y.-Y., (0000-0001-9759-1166) Köhler, A., (0000-0003-4362-3438) Zarini, O., Heinemann, T., Gilljohann, M. F., Ding, H., Götzfried, J., Döpp, A., Kononenko, O., Raj, G., Martines De La Ossa, A., Assmann, R., Hidding, B., Karsch, S., Code, S., (0000-0002-4626-0049) Irman, A., (0000-0003-0390-7671) Schramm, U., (0000-0002-8258-3881) Bussmann, M., (0000-0001-7990-9564) Pausch, R., (0000-0002-3844-3697) Debus, A., (0000-0001-8965-1149) Steiniger, K., (0000-0001-6994-2475) Garten, M., (0000-0003-1943-7141) Hübl, A., (0000-0003-1642-0459) Widera, R., (0000-0003-0340-9963) Kurz, T., Schöbel, S., (0000-0001-9129-4208) Couperus Cabadağ, J. P., Chang, Y.-Y., (0000-0001-9759-1166) Köhler, A., (0000-0003-4362-3438) Zarini, O., Heinemann, T., Gilljohann, M. F., Ding, H., Götzfried, J., Döpp, A., Kononenko, O., Raj, G., Martines De La Ossa, A., Assmann, R., Hidding, B., Karsch, S., Code, S., (0000-0002-4626-0049) Irman, A., (0000-0003-0390-7671) Schramm, U., and (0000-0002-8258-3881) Bussmann, M.
Abstract: The poster gives an overview of the LPWFA experimental setup and explains in detail the accompanying simulation campaign.
Published: 2019

94. Laser-driven proton beam profiles in ultra-high fields

Author: (0000-0001-9236-8037) Obst-Hübl, L., (0000-0003-1739-0159) Bernert, C., (0000-0002-9859-2408) Brack, F.-E., Branco, J., (0000-0002-8258-3881) Bussmann, M., Cochran, G., (0000-0002-5845-000X) Cowan, T., Curry, C. B., (0000-0002-6914-4083) Gaus, L., Fiuza, F., (0000-0001-6994-2475) Garten, M., Gauthier, M., Glenzer, S. H., Göde, S., (0000-0003-1943-7141) Hübl, A., (0000-0002-4626-0049) Irman, A., Kim, J. B., (0000-0003-4861-5584) Kluge, T., (0000-0002-0638-6990) Kraft, S., (0000-0002-0275-9892) Kroll, F., Macdonald, M. J., (0000-0002-9556-0662) Metzkes-Ng, J., Mishra, R., (0000-0001-7990-9564) Pausch, R., Poole, P., (0000-0003-0931-1350) Prencipe, I., (0000-0001-6200-6406) Rehwald, M., Rödel, C., Ruyer, C., (0000-0003-4400-1315) Schlenvoigt, H.-P., Sommer, P., Schoenwalder, C., Schumaker, W., (0000-0002-3727-7017) Ziegler, T., (0000-0003-0390-7671) Schramm, U., Schumacher, D. W., (0000-0003-3926-409X) Zeil, K., (0000-0001-9236-8037) Obst-Hübl, L., (0000-0003-1739-0159) Bernert, C., (0000-0002-9859-2408) Brack, F.-E., Branco, J., (0000-0002-8258-3881) Bussmann, M., Cochran, G., (0000-0002-5845-000X) Cowan, T., Curry, C. B., (0000-0002-6914-4083) Gaus, L., Fiuza, F., (0000-0001-6994-2475) Garten, M., Gauthier, M., Glenzer, S. H., Göde, S., (0000-0003-1943-7141) Hübl, A., (0000-0002-4626-0049) Irman, A., Kim, J. B., (0000-0003-4861-5584) Kluge, T., (0000-0002-0638-6990) Kraft, S., (0000-0002-0275-9892) Kroll, F., Macdonald, M. J., (0000-0002-9556-0662) Metzkes-Ng, J., Mishra, R., (0000-0001-7990-9564) Pausch, R., Poole, P., (0000-0003-0931-1350) Prencipe, I., (0000-0001-6200-6406) Rehwald, M., Rödel, C., Ruyer, C., (0000-0003-4400-1315) Schlenvoigt, H.-P., Sommer, P., Schoenwalder, C., Schumaker, W., (0000-0002-3727-7017) Ziegler, T., (0000-0003-0390-7671) Schramm, U., Schumacher, D. W., and (0000-0003-3926-409X) Zeil, K.
Abstract: Extreme field gradients intrinsic to relativistic laser-interactions with thin solid targets enable compact multi-MeV proton accelerators with unique bunch characteristics. Protons are accelerated in TV/m fields that are established within the micrometer-scale vicinity of the high-power laser focus. This initial acceleration phase is followed by ballistic proton bunch propagation with negligible space-charge effects over millimeters to hundreds of centimeters to the particle detector or a proton target at a dedicated irradiation site. The detected proton emission distribution can be influenced by the spatio-temporal intensity distribution in the laser focus, electron transport through the target, potential plasma instabilities, as well as local and global target geometry and surface properties. Substantially extending this picture, our recent results show a critical influence of the milimeter scale vacuum environment on the accelerated proton bunch, where residual gas molecules are ionized by the remnant laser light that is not absorbed into the target plasma but reflected or transmitted. In an experiment with µm-sized hydrogen jet targets, this effect lead to the counter-intuitive observation of laser near-field feature imprints in the detected proton beam profiles. Our results show that the remnant laser pulse induces a quasi-static deflecting field map in the ionized residual background gas that serves as a memorizing medium and allows for asynchronous information transfer to the naturally delayed proton bunch. Occurring under typical experimental laser, target and vacuum conditions, all-optical imprinting needs to be taken into account for sensible interpretation of modulated proton beam profiles.
Published: 2019

95. Scalable, Data Driven Plasma Simulations with PIConGPU

Author: (0000-0003-1943-7141) Huebl, A., (0000-0003-1642-0459) Widera, R., (0000-0001-6994-2475) Garten, M., (0000-0001-7990-9564) Pausch, R., (0000-0001-8965-1149) Steiniger, K., (0000-0003-3396-6154) Bastrakov, S., Meyer, F., Bastrakova, K., (0000-0002-3844-3697) Debus, A., (0000-0003-4861-5584) Kluge, T., (0000-0002-8218-3116) Ehrig, S., Werner, M., Worpitz, B., (0000-0002-6702-2015) Matthes, A., Rudat, S., (0000-0002-4519-4326) Starke, S., (0000-0002-8258-3881) Bussmann, M., (0000-0003-1943-7141) Huebl, A., (0000-0003-1642-0459) Widera, R., (0000-0001-6994-2475) Garten, M., (0000-0001-7990-9564) Pausch, R., (0000-0001-8965-1149) Steiniger, K., (0000-0003-3396-6154) Bastrakov, S., Meyer, F., Bastrakova, K., (0000-0002-3844-3697) Debus, A., (0000-0003-4861-5584) Kluge, T., (0000-0002-8218-3116) Ehrig, S., Werner, M., Worpitz, B., (0000-0002-6702-2015) Matthes, A., Rudat, S., (0000-0002-4519-4326) Starke, S., and (0000-0002-8258-3881) Bussmann, M.
Abstract: PIConGPU is an open source, multi-platform particle-in-cell code scaling to the fastest supercomputers in the TOP500 list. We present the architecture, novel developments, and workflows that enable high-precision, fast turn-around computations on Exascale-machines. Furthermore, we present our strategies to handle extreme data flows from thousands of GPUs for analysis with in situ processing and open data formats (openPMD). PIConGPU is since recently furthermore natively controlled by a Python Jupyter interface and we research just-in-time kernel generation for C++ with our Cling-CUDA extensions.
Published: 2019

96. All-optical structuring of laser-driven proton beam profiles

Author: (0000-0002-9556-0662) Metzkes-Ng, J., (0000-0003-1739-0159) Bernert, C., (0000-0002-9859-2408) Brack, F.-E., Branco, J., (0000-0002-8258-3881) Bussmann, M., (0000-0002-5845-000X) Cowan, T., Curry, C. B., (0000-0002-6914-4083) Gaus, L., Fiuza, F., (0000-0001-6994-2475) Garten, M., Gauthier, M., Glenzer, S. H., Göde, S., (0000-0003-1943-7141) Hübl, A., (0000-0002-4626-0049) Irman, A., Kim, J. B., (0000-0003-4861-5584) Kluge, T., (0000-0002-0638-6990) Kraft, S., (0000-0002-0275-9892) Kroll, F., Macdonald, M. J., Mishra, R., (0000-0001-9236-8037) Obst-Hübl, L., (0000-0001-7990-9564) Pausch, R., (0000-0003-0931-1350) Prencipe, I., (0000-0001-6200-6406) Rehwald, M., Rödel, C., Ruyer, C., (0000-0003-4400-1315) Schlenvoigt, H.-P., Sommer, P., Schoenwalder, C., Schumaker, W., (0000-0002-3727-7017) Ziegler, T., (0000-0003-0390-7671) Schramm, U., (0000-0003-3926-409X) Zeil, K., (0000-0002-9556-0662) Metzkes-Ng, J., (0000-0003-1739-0159) Bernert, C., (0000-0002-9859-2408) Brack, F.-E., Branco, J., (0000-0002-8258-3881) Bussmann, M., (0000-0002-5845-000X) Cowan, T., Curry, C. B., (0000-0002-6914-4083) Gaus, L., Fiuza, F., (0000-0001-6994-2475) Garten, M., Gauthier, M., Glenzer, S. H., Göde, S., (0000-0003-1943-7141) Hübl, A., (0000-0002-4626-0049) Irman, A., Kim, J. B., (0000-0003-4861-5584) Kluge, T., (0000-0002-0638-6990) Kraft, S., (0000-0002-0275-9892) Kroll, F., Macdonald, M. J., Mishra, R., (0000-0001-9236-8037) Obst-Hübl, L., (0000-0001-7990-9564) Pausch, R., (0000-0003-0931-1350) Prencipe, I., (0000-0001-6200-6406) Rehwald, M., Rödel, C., Ruyer, C., (0000-0003-4400-1315) Schlenvoigt, H.-P., Sommer, P., Schoenwalder, C., Schumaker, W., (0000-0002-3727-7017) Ziegler, T., (0000-0003-0390-7671) Schramm, U., and (0000-0003-3926-409X) Zeil, K.
Abstract: Extreme field gradients intrinsic to relativistic laser-interactions with thin solid targets enable compact multi-MeV proton accelerators. The initial µm-scale acceleration phase is followed by ballistic proton propagation with negligible space-charge effects over millimeters to hundreds of centimeters to a site of analysis/application. The detected proton distribution can be influenced by the spatio-temporal intensity distribution in the laser focus, electron transport, plasma instabilities, as well as target geometry and surface properties. Substantially extending this picture, our recent results show a critical influence of the mm-scale vacuum environment on the accelerated proton bunch, where residual gas molecules are ionized by the remnant laser light not absorbed into the target plasma but reflected or transmitted. In an experiment with µm-sized hydrogen jet targets, this effect lead to the counter-intuitive observation of laser near-field feature imprints in the detected proton beam profiles. Our results show that the remnant laser pulse induces a quasi-static deflecting field in the ionized residual background gas that serves as a memorizing medium and allows for asynchronous information transfer to the naturally delayed proton bunch. Occurring under typical experimental laser, target and vacuum conditions, all-optical imprinting needs to be taken into account for sensible interpretation of modulated proton beam profiles.
Published: 2019

97. Radiation imprint of ultra-intense laser heating of solids

Author: (0000-0001-6994-2475) Garten, M., (0000-0003-1943-7141) Hübl, A., (0000-0003-1642-0459) Widera, R., Göthel, I., (0000-0001-9236-8037) Obst-Hübl, L., (0000-0002-3727-7017) Ziegler, T., (0000-0003-3926-409X) Zeil, K., (0000-0002-5845-000X) Cowan, T., (0000-0003-0390-7671) Schramm, U., (0000-0002-8258-3881) Bussmann, M., (0000-0003-4861-5584) Kluge, T., (0000-0001-6994-2475) Garten, M., (0000-0003-1943-7141) Hübl, A., (0000-0003-1642-0459) Widera, R., Göthel, I., (0000-0001-9236-8037) Obst-Hübl, L., (0000-0002-3727-7017) Ziegler, T., (0000-0003-3926-409X) Zeil, K., (0000-0002-5845-000X) Cowan, T., (0000-0003-0390-7671) Schramm, U., (0000-0002-8258-3881) Bussmann, M., and (0000-0003-4861-5584) Kluge, T.
Abstract: Laser-accelerated ions are increasingly recognized as a promising alternative to conventionally accelerated ion beams. Possible applications range from fast ignition in laser fusion to ion tumor therapy as well as studies of transient high-current and high-field phenomena in laboratory astrophysics and material science. A combination of ultra-short duration and very high charge density is the most sought-after characteristic of these beams which are produced in the violent interaction of an ultra-intense short pulse laser with a solid target. We have performed the – to our knowledge – very first full 3D particle-in-cell simulations of this interaction that includes the picosecond time span prior to the arrival of the main laser pulse. This time period is thought to be decisive for the following main pulse interaction, yet it is poorly explored – partly due to the immense computational needs to resolve the plasma kinetically with full precision. Here, we bridge scales hitherto inaccessible, from attosecond plasma oscillations over few-femtosecond laser oscillations and transient, non-equilibrium plasma dynamics on the tens of femtosecond laser duration to picosecond pre-plasma development. We study the influence of pre-pulse laser conditions and material on the ion acceleration performance. Additionally, we aim to infer radiative signatures of the plasma dynamics and link them to isochoric heating, instability development, and other complex dynamics. Beyond gaining a fundamental understanding of the governing fundamental principle plasma dynamics, the results will be used in the ongoing development of novel diagnostics analyzing the bremsstrahlung and synchrotron radiation in order to experimentally probe the sub-ps interaction. The simulations have been performed at Piz Daint at CSCS, Switzerland, using the 3D particle-in-cell code PIConGPU developed at HZDR.
Published: 2019

98. Large-scale simulations of plasma acceleration

Author: (0000-0001-7990-9564) Pausch, R., (0000-0003-1943-7141) Hübl, A., (0000-0003-3396-6154) Bastrakov, S., (0000-0002-3844-3697) Debus, A., (0000-0001-6994-2475) Garten, M., (0000-0002-6702-2015) Matthes, A., (0000-0001-8965-1149) Steiniger, K., (0000-0003-0390-7671) Schramm, U., (0000-0003-1642-0459) Widera, R., Zenker, E., (0000-0002-8258-3881) Bussmann, M., (0000-0001-7990-9564) Pausch, R., (0000-0003-1943-7141) Hübl, A., (0000-0003-3396-6154) Bastrakov, S., (0000-0002-3844-3697) Debus, A., (0000-0001-6994-2475) Garten, M., (0000-0002-6702-2015) Matthes, A., (0000-0001-8965-1149) Steiniger, K., (0000-0003-0390-7671) Schramm, U., (0000-0003-1642-0459) Widera, R., Zenker, E., and (0000-0002-8258-3881) Bussmann, M.
Abstract: A brief presentation of the MuT/DMA activities of the Computational radiation group and solutions that might be of interest for the Matter in the Universe community.
Published: 2019

99. Enhanced ion acceleration from a non-ideal laser pulse contrast

Author: (0000-0001-6994-2475) Garten, M., Huebl, A., (0000-0003-1642-0459) Widera, R., Göthel, I., Obst-Huebl, L., (0000-0002-3727-7017) Ziegler, T., (0000-0003-3926-409X) Zeil, K., (0000-0002-5845-000X) Cowan, T., (0000-0003-0390-7671) Schramm, U., (0000-0002-8258-3881) Bussmann, M., (0000-0003-4861-5584) Kluge, T., (0000-0001-6994-2475) Garten, M., Huebl, A., (0000-0003-1642-0459) Widera, R., Göthel, I., Obst-Huebl, L., (0000-0002-3727-7017) Ziegler, T., (0000-0003-3926-409X) Zeil, K., (0000-0002-5845-000X) Cowan, T., (0000-0003-0390-7671) Schramm, U., (0000-0002-8258-3881) Bussmann, M., and (0000-0003-4861-5584) Kluge, T.
Abstract: The major challenges of compact proton sources driven by an ultrashort high-intensity laser are currently to establish precise control over proton beam parameters and shot-to-shot stability. Shooting ultrathin targets has shown to yield higher proton energies, which became recently accessible due to temporal laser pulse shape control using plasma-mirror techniques. We find that the intensity ramp, transmitted to the target by the plasma mirror during the last picosecond before the pulse peak, becomes significantly decisive for the subsequent acceleration performance. Reliable characterization of this ramp with modern laser diagnostics remains challenging and immense computational needs required to fully resolve the plasma kinetics leave it mostly unexplored in today's simulations of laser-solid interaction. We present the results of 3D large-scale simulations with PIConGPU, taking into account realistic contrast conditions, bridging the scales from picosecond pre-plasma formation over transient, non-equilibrium dynamics of the tens of femtosecond laser duration down to attosecond plasma oscillations. Adding to beneficial acceleration conditions presented by hybrid acceleration mechanisms and the onset of relativistic transparency, we show that the maximum proton energy can be optimized by a specific leading pulse edge via a combination of pre-thermal and thermal TNSA, surpassing the performance of the ideal diffraction-limited Gaussian pulse.
Published: 2019

100. Ion acceleration from ultra-thin foil targets with on-shot monitored temporal contrast

Author: (0000-0002-3727-7017) Ziegler, T., (0000-0003-1739-0159) Bernert, C., (0000-0002-9859-2408) Brack, F.-E., (0000-0002-8258-3881) Bussmann, M., (0000-0002-5845-000X) Cowan, T., (0000-0001-6994-2475) Garten, M., (0000-0003-4861-5584) Kluge, T., (0000-0002-0638-6990) Kraft, S., (0000-0002-0275-9892) Kroll, F., (0000-0002-9556-0662) Metzkes-Ng, J., (0000-0001-9236-8037) Obst-Hübl, L., (0000-0001-6200-6406) Rehwald, M., (0000-0003-4400-1315) Schlenvoigt, H.-P., (0000-0003-0390-7671) Schramm, U., (0000-0003-3926-409X) Zeil, K., (0000-0002-3727-7017) Ziegler, T., (0000-0003-1739-0159) Bernert, C., (0000-0002-9859-2408) Brack, F.-E., (0000-0002-8258-3881) Bussmann, M., (0000-0002-5845-000X) Cowan, T., (0000-0001-6994-2475) Garten, M., (0000-0003-4861-5584) Kluge, T., (0000-0002-0638-6990) Kraft, S., (0000-0002-0275-9892) Kroll, F., (0000-0002-9556-0662) Metzkes-Ng, J., (0000-0001-9236-8037) Obst-Hübl, L., (0000-0001-6200-6406) Rehwald, M., (0000-0003-4400-1315) Schlenvoigt, H.-P., (0000-0003-0390-7671) Schramm, U., and (0000-0003-3926-409X) Zeil, K.
Abstract: Laser-driven ion acceleration promises to provide a compact solution for demanding applications like particle therapy, proton radiography or inertial confinement research. Controlling the particle beam parameters to achieve these goals is currently pushing the frontier of laser driven particle accelerators. The performance of the plasma acceleration is strongly dependent on the complex pre-plasma formation process at the target front surface which is determined by the temporal intensity contrast. Particularly low-density targets require an enhanced temporal contrast to remain overcritical until the main pulse arrives. Plasma mirror setups have proven to significantly improve the temporal contrast by reducing pre-pulse intensity and steepening the rising edge of the main laser pulse, enabling the investigation of laser proton acceleration and proton energy scaling using ultra-thin targets. We present new experimental results on the interaction of the DRACO Petawatt ultra-short pulse laser with ultra-thin foil targets. Efficient and on-demand contrast cleaning established through a re-collimating plasma mirror setup facilitated thickness scans from the µm range down to several tens of nm. The combination of a complex set of diagnostics, consisting of proton detectors in target normal, laser forward and laser backward axis, laser pulse transmission and reflection diagnostics as well as detection of front surface electrons, delivered concrete indicators for the acceleration conditions. Furthermore, tremendous progress has been achieved by successfully implementing a novel laser contrast diagnostic by means of self-referenced spectral interferometry with extended time excursion (SRSI-ETE), allowing to characterize the temporal contrast in the experimental area on a single-shot base with unprecedented dynamic and temporal range.
Published: 2019

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