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

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.; Kando, M.; Kondo, K.

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.

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  • Secondary publication expected from 21.06.2021

Permalink: https://www.hzdr.de/publications/Publ-32174
Publ.-Id: 32174