Kawase, Keigo; Kando, Masaki; Hayakawa, Takehito; Daito, Izuru; Kondo, Shuji; Homma, Takayuki; Kameshima, Takashi*; Kotaki, Hideyuki; Chen, L. M.*; Fukuda, Yuji; et al.
JAEA-Conf 2010-002, p.95 - 98, 2010/06
At the previous symposium in Advanced Photon Research, we proposed and demonstrated the laser pulse compression via stimulated Brillouin scattering (SBS) for increasing the flux of the Compton backscattered X rays. After that, we improved the SBS pulse compression system by introducing the image relay in the laser transport line. As a result, we achieve the stably compressed laser pulse with a duration of 2.1 ns and with an energy of 0.84 J. By installing this system into the Compton backscattered X-ray source, the X-ray flux will be increased 3.2 times for the present system at the KPSI-JAEA.
Kiriyama, Hiromitsu; Mori, Michiaki; Nakai, Yoshiki; Shimomura, Takuya; Sasao, Hajime; Tanaka, Momoko; Ochi, Yoshihiro; Tanoue, Manabu*; Okada, Hajime; Kondo, Shuji; et al.
JAEA-Conf 2010-002, p.18 - 21, 2010/06
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 30 J broadband output energy, indicating the potential for achieving peak powers in excess of 500 TW. With a cleaned high-energy seeded OPCPA preamplifier as a front-end in the system, for the final compressed pulse (without pumping the booster amplifier) we found that the temporal contrast in this system exceeds 10 on the sub-nanosecond timescale, and is near 10 on the nanosecond timescale before the main femtosecond pulse. Using diffractive optical elements for beam homogenization of 100-J level high-energy Nd:glass green pump laser in a Ti:sapphire final amplifier, we have successfully generated broadband high-energy output with near-perfect top-hat intensity distributions.
Koike, Masato; Imazono, Takashi; Kawachi, Tetsuya
JAEA-Conf 2010-002, p.75 - 78, 2010/06
A multilayer laminar-type holographic grating having an average groove density of 2400 lines/mm was designed for use with a soft X-ray flat field spectrograph covering the 2.0-3.8 keV (0.33-0.62 nm) region. The varied-line-spaced grooves pattern was assumed to be generated by use of an aspheric wavefront recording system. We present a new scheme to widen the available wavelength range in the condition of a fixed incidence angle by use of multilayers having 5 period lengths, and discuss about the calculated diffraction efficiency and spectral resolution.
Terauchi, Masami*; Koike, Masato
JAEA-Conf 2010-002, p.71 - 74, 2010/06
no abstracts in English
JAEA-Conf 2010-002, p.120 - 123, 2010/06
no abstracts in English
Esirkepov, T. Z.; Bulanov, S. V.; Kando, Masaki; Pirozhkov, A. S.; Zhidkov, A.*
JAEA-Conf 2010-002, p.116 - 119, 2010/06