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13 results on '"Ditter, E. J."'

1. Source data: Enhanced ion acceleration from transparency-driven foils demonstrated at two ultraintense laser facilities

Author

(0000-0003-0420-3940) Dover, N. P., (0000-0002-3727-7017) Ziegler, T., (0000-0002-6928-2048) Assenbaum, S., (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., Ditter, E. J., Garten, M., Gaus, L., Göthel, I., Hicks, G. S., Kiriyama, H., (0000-0003-4861-5584) Kluge, T., (0000-0002-7231-0206) Koga, J. K., Kon, A., Kondo, K., (0000-0002-0638-6990) Kraft, S., (0000-0002-0275-9892) Kroll, F., Lowe, H. F., (0000-0002-9556-0662) Metzkes-Ng, J., Miyatake, T., Najmudin, Z., (0000-0002-4738-6436) Püschel, T., (0000-0001-6200-6406) Rehwald, M., Reimold, M., Sakaki, H., (0000-0003-4400-1315) Schlenvoigt, H.-P., Shiokawa, K., (0000-0001-7332-7395) Umlandt, M. E. P., (0000-0003-0390-7671) Schramm, U., (0000-0003-3926-409X) Zeil, K., (0000-0001-8143-0827) Nishiuchi, M., (0000-0003-0420-3940) Dover, N. P., (0000-0002-3727-7017) Ziegler, T., (0000-0002-6928-2048) Assenbaum, S., (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., Ditter, E. J., Garten, M., Gaus, L., Göthel, I., Hicks, G. S., Kiriyama, H., (0000-0003-4861-5584) Kluge, T., (0000-0002-7231-0206) Koga, J. K., Kon, A., Kondo, K., (0000-0002-0638-6990) Kraft, S., (0000-0002-0275-9892) Kroll, F., Lowe, H. F., (0000-0002-9556-0662) Metzkes-Ng, J., Miyatake, T., Najmudin, Z., (0000-0002-4738-6436) Püschel, T., (0000-0001-6200-6406) Rehwald, M., Reimold, M., Sakaki, H., (0000-0003-4400-1315) Schlenvoigt, H.-P., Shiokawa, K., (0000-0001-7332-7395) Umlandt, M. E. P., (0000-0003-0390-7671) Schramm, U., (0000-0003-3926-409X) Zeil, K., and (0000-0001-8143-0827) Nishiuchi, M.

Abstract

This dataset contains all source data used to generate figures and all other findings of the publication: " Enhanced ion acceleration from transparency-driven foils demonstrated at two ultraintense laser facilities".

Published
2024

2. Laser Transmission in the Relativistically Induced Transparency Regime for High Performance Proton Acceleration at PW Laser Systems

Author

(0000-0001-7332-7395) Umlandt, M. E. P., (0000-0002-6928-2048) Assenbaum, S., (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., Ditter, E. J., Dover, N. P., (0000-0001-6994-2475) Garten, M., (0000-0002-6914-4083) Gaus, L., Göthel, I., Hicks, G. S., Kiriyama, H., (0000-0003-4861-5584) Kluge, T., (0000-0002-7231-0206) Koga, J. K., Kon, A., Kondo, K., (0000-0002-0638-6990) Kraft, S., (0000-0002-0275-9892) Kroll, F., Lowe, H. F., (0000-0002-9556-0662) Metzkes-Ng, J., Miyatake, T., Najmudin, Z., (0000-0001-8143-0827) Nishiuchi, M., (0000-0002-4738-6436) Püschel, T., (0000-0001-6200-6406) Rehwald, M., (0000-0003-4962-2153) Reimold, M., Sakaki, H., (0000-0003-4400-1315) Schlenvoigt, H.-P., Shiokawa, K., (0000-0003-3926-409X) Zeil, K., (0000-0002-3727-7017) Ziegler, T., (0000-0003-0390-7671) Schramm, U., (0000-0001-7332-7395) Umlandt, M. E. P., (0000-0002-6928-2048) Assenbaum, S., (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., Ditter, E. J., Dover, N. P., (0000-0001-6994-2475) Garten, M., (0000-0002-6914-4083) Gaus, L., Göthel, I., Hicks, G. S., Kiriyama, H., (0000-0003-4861-5584) Kluge, T., (0000-0002-7231-0206) Koga, J. K., Kon, A., Kondo, K., (0000-0002-0638-6990) Kraft, S., (0000-0002-0275-9892) Kroll, F., Lowe, H. F., (0000-0002-9556-0662) Metzkes-Ng, J., Miyatake, T., Najmudin, Z., (0000-0001-8143-0827) Nishiuchi, M., (0000-0002-4738-6436) Püschel, T., (0000-0001-6200-6406) Rehwald, M., (0000-0003-4962-2153) Reimold, M., Sakaki, H., (0000-0003-4400-1315) Schlenvoigt, H.-P., Shiokawa, K., (0000-0003-3926-409X) Zeil, K., (0000-0002-3727-7017) Ziegler, T., and (0000-0003-0390-7671) Schramm, U.

Abstract

Ion acceleration by laser-plasma sources promises many applications, but reaching the required beam quality parameters demands a high level of understanding and control over the interaction process. Several advanced schemes, including the Relativistically Induced Transparency (RIT) regime, have been proposed and investigated in search of a stable acceleration for proton energies beyond 100 MeV. In the RIT scheme, the absorption of the electromagnetic laser field by the target and the generated plasma is critical. In joint experiments at the DRACO PW (HZDR) and J-KAREN (KPSI) lasers, we use transmission diagnostics to study the onset of transparency and learn about the sensitivity of the laser input to improve the process’s robustness. Using ultra-short pulses on thin solid density foil targets, we observe high performance proton beams in an expanded foil case. Our analysis of the effects on the transmission and its correlation with the acceleration performance indicates changes in the plasma interaction process.

Published
2023

3. Optimizing PW Laser-Driven Proton Acceleration by Characterizing Laser Transmission of Relativistically Transparent Targets

Author

(0000-0001-7332-7395) Umlandt, M. E. P., (0000-0002-6928-2048) Assenbaum, S., (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., Ditter, E. J., Dover, N. P., (0000-0001-6994-2475) Garten, M., (0000-0002-6914-4083) Gaus, L., Göthel, I., Hicks, G. S., Kiriyama, H., (0000-0003-4861-5584) Kluge, T., (0000-0002-7231-0206) Koga, J. K., Kon, A., Kondo, K., (0000-0002-0638-6990) Kraft, S., (0000-0002-0275-9892) Kroll, F., Lowe, H. F., (0000-0002-9556-0662) Metzkes-Ng, J., Miyatake, T., Najmudin, Z., (0000-0001-8143-0827) Nishiuchi, M., (0000-0002-4738-6436) Püschel, T., (0000-0001-6200-6406) Rehwald, M., (0000-0003-4962-2153) Reimold, M., Sakaki, H., (0000-0003-4400-1315) Schlenvoigt, H.-P., Shiokawa, K., (0000-0003-3926-409X) Zeil, K., (0000-0002-3727-7017) Ziegler, T., (0000-0003-0390-7671) Schramm, U., (0000-0001-7332-7395) Umlandt, M. E. P., (0000-0002-6928-2048) Assenbaum, S., (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., Ditter, E. J., Dover, N. P., (0000-0001-6994-2475) Garten, M., (0000-0002-6914-4083) Gaus, L., Göthel, I., Hicks, G. S., Kiriyama, H., (0000-0003-4861-5584) Kluge, T., (0000-0002-7231-0206) Koga, J. K., Kon, A., Kondo, K., (0000-0002-0638-6990) Kraft, S., (0000-0002-0275-9892) Kroll, F., Lowe, H. F., (0000-0002-9556-0662) Metzkes-Ng, J., Miyatake, T., Najmudin, Z., (0000-0001-8143-0827) Nishiuchi, M., (0000-0002-4738-6436) Püschel, T., (0000-0001-6200-6406) Rehwald, M., (0000-0003-4962-2153) Reimold, M., Sakaki, H., (0000-0003-4400-1315) Schlenvoigt, H.-P., Shiokawa, K., (0000-0003-3926-409X) Zeil, K., (0000-0002-3727-7017) Ziegler, T., and (0000-0003-0390-7671) Schramm, U.

Abstract

Ion acceleration by compact laser-plasma sources has great potential for a range of applications, including those with medical relevance and fusion experiments. However, in order to achieve the necessary beam quality parameters for these applications, a thorough understanding and control over the laser-plasma interaction process is required. Therefore, we are exploring laser plasma acceleration around the promising regime of Relativistically Induced Transparency (RIT) through joint studies at DRACO PW (HZDR) and the J-KAREN-P laser system at KPSI. We have performed thickness scans to investigate the relation between proton acceleration performance and target transparency, revealing high-performance proton beams (> 60 MeV) in an expanded foil case, with an optimum at the onset of target transparency. [1] Subsequent experiments showed even higher proton energies. Clearly, the relationship between the transparency onset time and the acceleration performance is crucial for achieving optimal beam parameters, improving our understanding of the sensitivity of laser input parameters, and increasing the process’s robustness. Thus, we are using a combination of particle and laser diagnostics to investigate this correlation. In this contribution, we present a summary of our studies in which we use spectral interferometry with the unperturbed laser beam as a reference to evaluate the output of reflected and transmitted light diagnostics. Obtaining features like shown in Bagnoud et al. [2] and Williamson et al. [3], we additionally correlate these measures with the proton acceleration performance and show first results of spectral, spatial, and energy analysis of the effects on the laser transmission through the target. References [1] Dover, N. P. et al.: Enhanced ion acceleration from transparency-driven foils demonstrated at two ultraintense laser facilities. Light Sci. Appl. in press (2023). [2] Bagnoud, V. et al.: Studying the Dynamics of Relativistic Laser-Plasma Interactio

Published
2023

4. Enhanced ion acceleration from transparency-driven foils demonstrated at two ultraintense laser facilities

Author

Dover, N. P., (0000-0002-3727-7017) Ziegler, T., (0000-0002-6928-2048) Assenbaum, S., (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., Ditter, E. J., Garten, M., Gaus, L., Göthel, I., Hicks, G. S., Kiriyama, H., (0000-0003-4861-5584) Kluge, T., Koga, J. K., Kon, A., Kondo, K., (0000-0002-0638-6990) Kraft, S., (0000-0002-0275-9892) Kroll, F., Lowe, H. F., (0000-0002-9556-0662) Metzkes-Ng, J., Miyatake, T., Najmudin, Z., (0000-0002-4738-6436) Püschel, T., (0000-0001-6200-6406) Rehwald, M., Reimold, M., Sakaki, H., (0000-0003-4400-1315) Schlenvoigt, H.-P., Shiokawa, K., (0000-0001-7332-7395) Umlandt, M. E. P., (0000-0003-0390-7671) Schramm, U., (0000-0003-3926-409X) Zeil, K., Nishiuchi, M., Dover, N. P., (0000-0002-3727-7017) Ziegler, T., (0000-0002-6928-2048) Assenbaum, S., (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., Ditter, E. J., Garten, M., Gaus, L., Göthel, I., Hicks, G. S., Kiriyama, H., (0000-0003-4861-5584) Kluge, T., Koga, J. K., Kon, A., Kondo, K., (0000-0002-0638-6990) Kraft, S., (0000-0002-0275-9892) Kroll, F., Lowe, H. F., (0000-0002-9556-0662) Metzkes-Ng, J., Miyatake, T., Najmudin, Z., (0000-0002-4738-6436) Püschel, T., (0000-0001-6200-6406) Rehwald, M., Reimold, M., Sakaki, H., (0000-0003-4400-1315) Schlenvoigt, H.-P., Shiokawa, K., (0000-0001-7332-7395) Umlandt, M. E. P., (0000-0003-0390-7671) Schramm, U., (0000-0003-3926-409X) Zeil, K., and Nishiuchi, M.

Abstract

Laser-driven ion sources are a rapidly developing technology producing high energy, high peak current beams. Their suitability for applications, such as compact medical accelerators, motivates development of robust acceleration schemes using widely available repetitive ultraintense femtosecond lasers. These applications not only require high beam energy, but also place demanding requirements on the source stability and controllability. This can be seriously affected by the laser temporal contrast, precluding the replication of ion acceleration performance on independent laser systems with otherwise similar parameters. Here, we present the experimental generation of >60 MeV protons and >30 MeV u^{−1} carbon ions from sub-micrometre thickness Formvar foils irradiated with laser intensities >10^{21} W/cm^{2}. Ions are accelerated by an extreme localised space charge field ≳30 TVm^{−1}, over a million times higher than used in conventional accelerators. The field is formed by a rapid expulsion of electrons from the target bulk due to relativistically induced transparency, in which relativistic corrections to the refractive index enables laser transmission through normally opaque plasma. We replicate the mechanism on two different laser facilities and show that the optimum target thickness decreases with improved laser contrast due to reduced pre-expansion. Our demonstration that energetic ions can be accelerated by this mechanism at different contrast levels relaxes laser requirements and indicates interaction parameters for realising application-specific beam delivery.

Published
2023

6. Selective Ion Acceleration by Intense Radiation Pressure

Author

McIlvenny, A., primary, Doria, D., additional, Romagnani, L., additional, Ahmed, H., additional, Booth, N., additional, Ditter, E. J., additional, Ettlinger, O. C., additional, Hicks, G. S., additional, Martin, P., additional, Scott, G. G., additional, Williamson, S. D. R., additional, Macchi, A., additional, McKenna, P., additional, Najmudin, Z., additional, Neely, D., additional, Kar, S., additional, and Borghesi, M., additional

Published
2021
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7. Demonstration of repetitive energetic proton generation by ultra-intense laser interaction with a tape target

Author

Dover, N. P., Nishiuchia, M., Sakaki, H., Kondo, K., Lowe, H. F., Alkhimova, M. A., Ditter, E. J., Ettlinger, O. C., Faenov, A. Y., Hata, M., Hicks, G. S., Iwata, N., Kiriyama, H., Koga, J. K., Miyahara, T., Najmudin, Z., Pikuz, T. A., Pirozhkov, A. S., Sagisaka, A., Schramm, U., Sentoku, Y., Watanabe, Y., Ziegler, T., Zeil, K., and Kando, M.

Abstract

High power laser systems are an attractive driver for compact energetic ion sources. We demonstrate repetitive acceleration at 0.1 Hz of proton beams up to 40 MeV from a reeled tape target irradiated by ultra-high intensities up to 5 × 1021 Wcm 2 and laser energies ≈ 15 J using the J-KAREN-P laser system. We investigate the stability of the source and its behaviour with laser spot focal size. We compare the scaling of proton energy with laser energy to a recently developed analytical model, and also demonstrate that it is possible to reach energies up to 50 MeV on a single shot with a lower laser energy ≈ 10 J by using a thinner target, motivating development of high repetition targetry suitable for thinner targets.

Published
2020

8. High-Intensity Laser-Driven Oxygen Source from CW Laser-Heated Titanium Tape Targets

Author

Kondo, K., (0000-0001-8143-0827) Nishiuchi, M., Sakaki, H., (0000-0003-0420-3940) Dover, N. P., (0000-0002-9085-1073) Lowe, H. F., Miyahara, T., Watanabe, Y., (0000-0002-3727-7017) Ziegler, T., (0000-0003-3926-409X) Zeil, K., (0000-0003-0390-7671) Schramm, U., Ditter, E. J., (0000-0002-7797-5979) Hicks, G. S., Ettlinger, O. C., (0000-0001-6323-4005) Najmudin, Z., Kiriyama, H., (0000-0002-9821-6779) Kando, M., Kondo, K., (0000-0001-8143-0827) Nishiuchi, M., Sakaki, H., (0000-0003-0420-3940) Dover, N. P., (0000-0002-9085-1073) Lowe, H. F., Miyahara, T., Watanabe, Y., (0000-0002-3727-7017) Ziegler, T., (0000-0003-3926-409X) Zeil, K., (0000-0003-0390-7671) Schramm, U., Ditter, E. J., (0000-0002-7797-5979) Hicks, G. S., Ettlinger, O. C., (0000-0001-6323-4005) Najmudin, Z., Kiriyama, H., and (0000-0002-9821-6779) Kando, M.

Abstract

The interaction of high-intensity laser pulses with solid targets can be used as a highly charged, energetic heavy ion source. Normally, intrinsic contaminants on the target surface suppress the performance of heavy ion acceleration from a high-intensity laser–target interaction, resulting in preferential proton acceleration. Here, we demonstrate that CW laser heating of 5 µm titanium tape targets can remove contaminant hydrocarbons in order to expose a thin oxide layer on the metal surface, ideal for the generation of energetic oxygen beams. This is demonstrated by irradiating the heated targets with a PW class high-power laser at an intensity of 5 x 10^21 W/cm^2, showing enhanced acceleration of oxygen ions with a non-thermal-like distribution. Our new scheme using a CW laser-heated Ti tape target is promising for use as a moderate repetition energetic oxygen ion source for future applications.

Published
2020

9. Dynamics of laser-driven heavy-ion acceleration clarified by ion charge states

Author

Nishiuchi, M., primary, Dover, N. P., additional, Hata, M., additional, Sakaki, H., additional, Kondo, Ko., additional, Lowe, H. F., additional, Miyahara, T., additional, Kiriyama, H., additional, Koga, J. K., additional, Iwata, N., additional, Alkhimova, M. A., additional, Pirozhkov, A. S., additional, Faenov, A. Ya., additional, Pikuz, T. A., additional, Sagisaka, A., additional, Watanabe, Y., additional, Kando, M., additional, Kondo, K., additional, Ditter, E. J., additional, Ettlinger, O. C., additional, Hicks, G. S., additional, Najmudin, Z., additional, Ziegler, T., additional, Zeil, K., additional, Schramm, U., additional, and Sentoku, Y., additional

Published
2020
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12. Transition to light sail acceleration using ultraintense femtosecond pulses

Author

Philip Martin, Doria, D., Romagnani, L., Ahmed, H., Aodhan McIlvenny, Scullion, C., Williamson, S. D. R., Ditter, E. J., Hicks, G., Ettlinger, O. C., Scott, G. G., Symes, D. R., Booth, N., Sgattoni, A., Macchi, A., Satyabrata Kar, Mckenna, P., Najmudin, Z., Neely, D., Zepf, M., Marco Borghesi, Fajardo, M., Westerhof, E., Riconda, C., Melzer, A., Bret, A., and Dromey, B.

Subjects
QC717
Abstract

Presented are results from experimental campaigns undertaken on the Gemini laser system at the Central Laser Facility in the UK. In these experiments amorphous carbon targets ranging in thickness from 10nm to 100nm were irradiated with high contrast 40fs pulses with an intensity up to 1021 W/cm2, for both circular and linear polarisations and the resulting proton and ion spectra compared. Examining the highest energies achieved for a given polarisation and target thickness, allows to identify the transition from TNSA to LS. Observations of the optimal target thickness for ion acceleration are compared to analytical predictions from LS theory, in addition to results from Particle in Cell modelling.

13. Generation of intense quasi-electrostatic fields due to deposition of particles accelerated by petawatt-range laser-matter interactions

Author

T. Robinson, Roland Smith, E. J. Ditter, G. Hicks, Fabrizio Consoli, M. M. Notley, Zulfikar Najmudin, Samuel Giltrap, O. C. Ettlinger, R. De Angelis, Consoli, F., De Angelis, R., Robinson, T. S., Giltrap, S., Hicks, G. S., Ditter, E. J., Ettlinger, O. C., Najmudin, Z., Notley, M., Smith, R. A., Engineering & Physical Science Research Council (E, Science and Technology Facilities Council (STFC), Engineering & Physical Science Research Council (EPSRC), and Imperial College Trust

Subjects
0301 basic medicine, Field (physics), lcsh:Medicine, Article, law.invention, 03 medical and health sciences, 0302 clinical medicine, law, Electric field, lcsh:Science, Electromagnetic pulse, Physics, Range (particle radiation), Multidisciplinary, Spectrometer, Nuclear fusion and fission, lcsh:R, Laser-produced plasmas, Nanosecond, Laser, Electrical and electronic engineering, Magnetic field, Computational physics, Applied physics, 030104 developmental biology, lcsh:Q, Applied optics, 030217 neurology & neurosurgery
Abstract

We demonstrate here for the first time that charge emitted by laser-target interactions at petawatt peak-powers can be efficiently deposited on a capacitor-collector structure far away from the target and lead to the rapid (tens of nanoseconds) generation of large quasi-static electric fields over wide (tens-of-centimeters scale-length) regions, with intensities much higher than common ElectroMagnetic Pulses (EMPs) generated by the same experiment in the same position. A good agreement was obtained between measurements from a classical field-probe and calculations based on particle-flux measurements from a Thomson spectrometer. Proof-of-principle particle-in-cell simulations reproduced the measurements of field evolution in time, giving a useful insight into the charging process, generation and distribution of fields. The understanding of this charging phenomenon and of the related intense fields, which can reach the MV/m order and in specific configurations might also exceed it, is very important for present and future facilities studying laser-plasma-acceleration and inertial-confinement-fusion, but also for application to the conditioning of accelerated charged-particles, the generation of intense electric and magnetic fields and many other multidisciplinary high-power laser-driven processes.

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