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1. Laser-driven high-energy proton beams from cascaded acceleration regimes

Author

(0000-0002-3727-7017) Ziegler, T., Göthel, I., (0000-0002-6928-2048) Assenbaum, S., (0000-0003-1739-0159) Bernert, C., (0000-0002-9859-2408) Brack, F.-E., (0000-0002-5845-000X) Cowan, T., (0000-0003-0420-3940) Dover, N. P., (0000-0002-6914-4083) Gaus, L., (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., (0000-0003-0931-1350) Prencipe, I., (0000-0002-4738-6436) Püschel, T., (0000-0001-6200-6406) Rehwald, M., (0000-0003-4962-2153) Reimold, M., (0000-0003-4400-1315) Schlenvoigt, H.-P., (0000-0001-7332-7395) Umlandt, M. E. P., (0000-0002-2828-5373) Vescovi Pinochet, M. A., (0000-0003-0390-7671) Schramm, U., (0000-0003-3926-409X) Zeil, K., (0000-0002-3727-7017) Ziegler, T., Göthel, I., (0000-0002-6928-2048) Assenbaum, S., (0000-0003-1739-0159) Bernert, C., (0000-0002-9859-2408) Brack, F.-E., (0000-0002-5845-000X) Cowan, T., (0000-0003-0420-3940) Dover, N. P., (0000-0002-6914-4083) Gaus, L., (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., (0000-0003-0931-1350) Prencipe, I., (0000-0002-4738-6436) Püschel, T., (0000-0001-6200-6406) Rehwald, M., (0000-0003-4962-2153) Reimold, M., (0000-0003-4400-1315) Schlenvoigt, H.-P., (0000-0001-7332-7395) Umlandt, M. E. P., (0000-0002-2828-5373) Vescovi Pinochet, M. A., (0000-0003-0390-7671) Schramm, U., and (0000-0003-3926-409X) Zeil, K.

Abstract

Laser-driven ion accelerators can deliver high-energy, high-peak current beams and are thus attracting attention as a compact alternative to conventional accelerators. However, achieving sufficiently high energy levels suitable for applications such as radiation therapy remains a challenge for laser-driven ion accelerators. Here we generate proton beams with a spectrally separated high-energy component of up to 150 MeV by irradiating solid-density plastic foil targets with ultrashort laser pulses from a repetitive petawatt laser. The preceding laser light heats the target, leading to the onset of relativistically induced transparency upon main pulse arrival. The laser peak then penetrates the initially opaque target and triggers proton acceleration through a cascade of different mechanisms, as revealed by three-dimensional particle-in-cell simulations. The transparency of the target can be used to identify the high-performance domain, making it a suitable feedback parameter for automated laser and target optimization to enhance stability of plasma accelerators in the future.

Published
2024

2. 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

3. Source Data: Laser-driven high-energy proton beams from cascaded acceleration regimes

Author

(0000-0002-3727-7017) Ziegler, T., Göthel, I., (0000-0002-6928-2048) Assenbaum, S., (0000-0003-1739-0159) Bernert, C., (0000-0002-9859-2408) Brack, F.-E., (0000-0002-5845-000X) Cowan, T., (0000-0003-0420-3940) Dover, N. P., (0000-0002-6914-4083) Gaus, L., (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., (0000-0003-0931-1350) Prencipe, I., (0000-0002-4738-6436) Püschel, T., (0000-0001-6200-6406) Rehwald, M., (0000-0003-4962-2153) Reimold, M., (0000-0003-4400-1315) Schlenvoigt, H.-P., (0000-0001-7332-7395) Umlandt, M. E. P., (0000-0002-2828-5373) Vescovi Pinochet, M. A., (0000-0003-0390-7671) Schramm, U., (0000-0003-3926-409X) Zeil, K., (0000-0002-3727-7017) Ziegler, T., Göthel, I., (0000-0002-6928-2048) Assenbaum, S., (0000-0003-1739-0159) Bernert, C., (0000-0002-9859-2408) Brack, F.-E., (0000-0002-5845-000X) Cowan, T., (0000-0003-0420-3940) Dover, N. P., (0000-0002-6914-4083) Gaus, L., (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., (0000-0003-0931-1350) Prencipe, I., (0000-0002-4738-6436) Püschel, T., (0000-0001-6200-6406) Rehwald, M., (0000-0003-4962-2153) Reimold, M., (0000-0003-4400-1315) Schlenvoigt, H.-P., (0000-0001-7332-7395) Umlandt, M. E. P., (0000-0002-2828-5373) Vescovi Pinochet, M. A., (0000-0003-0390-7671) Schramm, U., and (0000-0003-3926-409X) Zeil, K.

Abstract

This dataset contains all source data used to generate figures and all other findings of the publication: "Laser-driven high-energy proton beams from cascaded acceleration regimes".

Published
2024

4. 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

5. 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

6. 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

7. Spectral-temporal Measurement Capabilities of Third-order Correlators

Author

(0000-0002-1919-8585) Bock, S., (0000-0003-3593-1609) Oksenhendler, T., (0000-0002-4738-6436) Püschel, T., Gebhardt, R., Helbig, U., (0000-0001-7990-9564) Pausch, R., (0000-0002-3727-7017) Ziegler, T., (0000-0003-1739-0159) Bernert, C., (0000-0003-3926-409X) Zeil, K., (0000-0002-4626-0049) Irman, A., (0000-0001-7986-3631) Toncian, T., (0000-0001-8298-4442) Kiriyama, H., (0000-0001-8143-0827) Nishiuchi, M., (0000-0003-4728-2079) Kon, A., (0000-0003-0390-7671) Schramm, U., (0000-0002-1919-8585) Bock, S., (0000-0003-3593-1609) Oksenhendler, T., (0000-0002-4738-6436) Püschel, T., Gebhardt, R., Helbig, U., (0000-0001-7990-9564) Pausch, R., (0000-0002-3727-7017) Ziegler, T., (0000-0003-1739-0159) Bernert, C., (0000-0003-3926-409X) Zeil, K., (0000-0002-4626-0049) Irman, A., (0000-0001-7986-3631) Toncian, T., (0000-0001-8298-4442) Kiriyama, H., (0000-0001-8143-0827) Nishiuchi, M., (0000-0003-4728-2079) Kon, A., and (0000-0003-0390-7671) Schramm, U.

Abstract

We present a method extending scanning third-order correlator temporal pulse14 evolution measurement capabilities of high power short pulse lasers to spectral sensitivity within15 the spectral range exploited by typical chirped pulse amplification systems. Modelling of the16 spectral response achieved by angle tuning of the third harmonic generating crystal is applied17 and experimentally validated. Exemplary measurements of spectrally resolved pulse contrast of a18 Petawatt laser frontend illustrate the importance of full bandwidth coverage for the interpretation19 of relativistic laser target interaction in particular for the case of solid targets.

Published
2023

8. 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

9. 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

10. 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

11. Non-linearity induced contrast degradation in high-power lasers

Author

(0000-0002-1919-8585) Bock, S., (0000-0003-3593-1609) Oksenhendler, T., (0000-0002-4738-6436) Püschel, T., Gebhardt, R., Helbig, U., (0000-0002-3727-7017) Ziegler, T., (0000-0003-3926-409X) Zeil, K., (0000-0001-7990-9564) Pausch, R., (0000-0001-7986-3631) Toncian, T., (0000-0001-8143-0827) Nishiuchi, M., (0000-0001-8298-4442) Kiriyama, H., (0000-0003-0390-7671) Schramm, U., (0000-0002-1919-8585) Bock, S., (0000-0003-3593-1609) Oksenhendler, T., (0000-0002-4738-6436) Püschel, T., Gebhardt, R., Helbig, U., (0000-0002-3727-7017) Ziegler, T., (0000-0003-3926-409X) Zeil, K., (0000-0001-7990-9564) Pausch, R., (0000-0001-7986-3631) Toncian, T., (0000-0001-8143-0827) Nishiuchi, M., (0000-0001-8298-4442) Kiriyama, H., and (0000-0003-0390-7671) Schramm, U.

Abstract

The characteristics of high power lasers applied for relativistic plasma experiments are a matter of constant research and improvement for supporting highest possible performance. Especially the temporal contrast is crucial, while different mechanisms can lead to its degradation. One prominent effect is the non-linear B-integral induced pulse coupling from a post pulse generating a pre-pulse, generally described by Didenko, et.al. [1]. Recent measurements showed a more complex behavior with delayed pre-pulse generation and complex temporal shapes [2]. We applied an improved SRSI-ETE [3] setup to measure the non-linear pulse coupling at the DRACO Petawatt facility [4], revealing the spectral-temporal structure of the generated pulses. To assist the understanding of the observed non-linear effects a model was developed [5], covering the principle B-integral induced pulse generation, as well as the generation of the additional pulse structures, by means of non-resonant and resonant non-linear optical effects. The performed study allows a full understanding of the non-linear processes generating the pre-pulse and subsequent structures.

Published
2022

12. Non-linearity induced contrast degradation in high-power lasers

Author

(0000-0002-1919-8585) Bock, S., (0000-0003-3593-1609) Oksenhendler, T., (0000-0002-4738-6436) Püschel, T., Gebhardt, R., Helbig, U., (0000-0002-3727-7017) Ziegler, T., (0000-0003-3926-409X) Zeil, K., (0000-0001-7990-9564) Pausch, R., (0000-0001-7986-3631) Toncian, T., (0000-0001-8143-0827) Nishiuchi, M., (0000-0001-8298-4442) Kiriyama, H., (0000-0003-0390-7671) Schramm, U., (0000-0002-1919-8585) Bock, S., (0000-0003-3593-1609) Oksenhendler, T., (0000-0002-4738-6436) Püschel, T., Gebhardt, R., Helbig, U., (0000-0002-3727-7017) Ziegler, T., (0000-0003-3926-409X) Zeil, K., (0000-0001-7990-9564) Pausch, R., (0000-0001-7986-3631) Toncian, T., (0000-0001-8143-0827) Nishiuchi, M., (0000-0001-8298-4442) Kiriyama, H., and (0000-0003-0390-7671) Schramm, U.

Abstract

The characteristics of high power lasers applied for relativistic plasma experiments are a matter of constant research and improvement for supporting highest possible performance. Especially the temporal contrast is crucial, while different mechanisms can lead to its degradation. One prominent effect is the non-linear B-integral induced pulse coupling from a post pulse generating a pre-pulse, generally described by Didenko, et.al. [1]. Recent measurements showed a more complex behavior with delayed pre-pulse generation and complex temporal shapes [2]. We applied an improved SRSI-ETE [3] setup to measure the non-linear pulse coupling at the DRACO Petawatt facility [4], revealing the spectral-temporal structure of the generated pulses. To assist the understanding of the observed non-linear effects a model was developed [5], covering the principle B-integral induced pulse generation, as well as the generation of the additional pulse structures, by means of non-resonant and resonant non-linear optical effects. The performed study allows a full understanding of the non-linear processes generating the pre-pulse and subsequent structures.

Published
2022

13. 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

14. 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

15. 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

16. 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

17. 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

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