Laser-driven proton acceleration and plasma diagnostics with J-KAREN laser

A. S. Pirozhkov; M. Mori; A. Yogo; H. Kiriyama; K. Ogura; A. Sagisaka; J.-L. Ma; S. Orimo; M. Nishiuchi; H. Sugiyama; T. Zh. Esirkepov; S. V. Bulanov; H. Okada; S. Kondo; S. Kanazawa; Y. Nakai; A. Akutsu; T. Motomura; M. Tanoue; T. Shimomura; M. Ikegami; T. Shirai; Y. Iwashita; A. Noda; I. W. Choi; S. K. Lee; J. Lee; Y. Oishi; T. Kimura; T. Tajima; H. Daido

doi:10.1117/12.820635

19 May 2009 Laser-driven proton acceleration and plasma diagnostics with J-KAREN laser

A. S. Pirozhkov, M. Mori, A. Yogo, H. Kiriyama, K. Ogura, A. Sagisaka, J.-L. Ma, S. Orimo, M. Nishiuchi, H. Sugiyama, T. Zh. Esirkepov, S. V. Bulanov, H. Okada, S. Kondo, S. Kanazawa, Y. Nakai, A. Akutsu, T. Motomura, M. Tanoue, T. Shimomura, M. Ikegami, T. Shirai, Y. Iwashita, A. Noda, I. W. Choi, S. K. Lee, J. Lee, Y. Oishi, T. Kimura, T. Tajima, H. Daido

Author Affiliations +

Proceedings Volume 7354, Nonlinear Optics and Applications III; 735414 (2009) https://doi.org/10.1117/12.820635
Event: SPIE Optics + Optoelectronics, 2009, Prague, Czech Republic

Abstract

We describe results of experiments on laser-driven proton acceleration and corresponding laser-plasma diagnostics performed with the multi-10-TW J-KAREN laser. The laser consists of a high-pulse-energy oscillator, saturable absorber, stretcher, Optical Parametric Chirped Pulse Amplifier (OPCPA), two 4-pass Ti:Sapphire amplifiers, and compressor. The final amplifier is cryogenically cooled down to 100 K to avoid thermal lensing. The laser provides ~30 fs, ~ 1 J, high-contrast pulses with the nanosecond contrast better than 10¹⁰. The peak intensity is 10²⁰ W/cm² with the 3- 4 μm focal spot. Using few-μm tape and sub-μm ribbon targets we produced protons with the energies up to 4 MeV. The tape target and repetitive laser operation allowed achieving proton acceleration at 1 Hz. We found significant differences in stability and angular distribution of proton beam in high-contrast and normal-contrast modes. The plasma diagnostics included interferometry and measurement of the target reflectivity. The latter provides convenient diagnostics of the laser contrast in the ion acceleration, harmonics generation, and other laser - solid target interaction experiments.

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A. S. Pirozhkov, M. Mori, A. Yogo, H. Kiriyama, K. Ogura, A. Sagisaka, J.-L. Ma, S. Orimo, M. Nishiuchi, H. Sugiyama, T. Zh. Esirkepov, S. V. Bulanov, H. Okada, S. Kondo, S. Kanazawa, Y. Nakai, A. Akutsu, T. Motomura, M. Tanoue, T. Shimomura, M. Ikegami, T. Shirai, Y. Iwashita, A. Noda, I. W. Choi, S. K. Lee, J. Lee, Y. Oishi, T. Kimura, T. Tajima, and H. Daido "Laser-driven proton acceleration and plasma diagnostics with J-KAREN laser", Proc. SPIE 7354, Nonlinear Optics and Applications III, 735414 (19 May 2009); https://doi.org/10.1117/12.820635

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