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Kando, Masaki; Mori, Michiaki; Kotaki, Hideyuki; Hayashi, Yukio; Nishimura, Hiroaki*
Osaka Daigaku Reza Enerugigaku Kenkyu Senta Heisei-23-Nendo Kyodo Riyo, Kyodo Kenkyu Seika Hokokusho, p.13 - 14, 2012/03
This paper reports collaboration work between JAEA and Osaka University on the high energy electron acceleration using the LFEX laser. At JAEA we have examined the conditions for generating stable electrons with a 4-TW laser. We used Ar gas, which was found by us to produce stabler electrons and measured reproducibility at 4.0 TW and 3.6 TW. We found that there is a density threshold; the reproducibility becomes almost 100% when the density is larger than the threshold. We also noticed that the threshold value decreases as increasing the laser power. In addition, we report on the status of a sampling calorimeter, which will be used in the future laser acceleration experiments with LFEX.
Kiriyama, Hiromitsu; Mori, Michiaki; Shimomura, Takuya; Miyanaga, Noriaki*
Osaka Daigaku Reza Enerugigaku Kenkyu Senta Heisei-23-Nendo Kyodo Riyo, Kyodo Kenkyu Seika Hokokusho, p.113 - 114, 2012/03
We have developed a femtosecond high intensity laser system, which combines both Ti:sapphire chirped-pulse amplification (CPA) and optical parametric chirped-pulse amplification (OPCPA) techniques, that produces more than 28 J broadband output energy, indicating the potential for achieving peak powers of 600 TW. With a cleaned high-energy seeded OPCPA preamplifier with a saturable absorber as a front-end in the system, for the final compressed pulse we found that the temporal contrast in this system exceeds 10 on the sub-nanosecond timescale before the main femtosecond pulse.