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


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