Speaker
Dr
Zhe Zhang
(Osaka University)
Description
The absolute energy transfer efficiency from laser to hot electrons in fast ignition plasma was estimated by applying quantitative high energy Kalpha x-ray spectroscopy. The absolute yield of Sn, Ta and Au Kalpha lines were measured by a calibrated Laue spectrometer. The Laue spectrometer was developed to cover the high energy Kalpha lines from Mo (Kalpha 17.48 keV) to Au (Kalpha: 68.80 keV). Absolute calibrations have been carried out for the crystal and detector separately by using pre-calibrated laser produced Kalpha sources and radiation isotopes. The hot electron propagation inside the solid target and Kalpha photon generation is simulated with a Monte-Carlo simulation. Considering the Kalpha photon number measured by the Laue spectrometer, the transfer efficiencies were estimated by comparing the experimental measurement and simulation results.
The transfer efficiencies from LFEX to target were estimated with planar and cone-guided geometries. Four types of cone were used: the standard Au cone with 7-microm thickness; an open Au cone without tip; a W-shape Au cone with double Au layers; and a diamond like carbon (DLC) cone. The transfer efficiencies of LFEX laser to a guiding-cone was found to be much higher than the planar target case, and was quantified to be 20% to 50%.
| Country or International Organisation | Japan |
|---|---|
| Paper Number | IFE/P6-2 |
Primary author
Dr
Zhe Zhang
(Osaka University)
Co-authors
Dr
Atsushi sunahara
(Institute for Laser Technology, 2-6 Yamada-oka, Suita, Osaka 565-0871, Japan)
Mr
Gerald Jackson WILLIAMS
(Lawrence Livermore National Laboratory, Livermore, CA 94550, USA)
Mr
Hideo Nagatomo
(Osaka University)
Prof.
Hiroaki Nishimura
(Institute of Laser Engineering, Osaka University, 2-6 Yamada-oka, Suita, Osaka 565-0871, Japan)
Prof.
Hiroshi AZECHI
(Institute of Laser Engineering, Osaka University)
Prof.
Hiroyuki Shiraga
(Institute of Laser Engineering, Osaka University)
Mr
Jaebum PARK
(Lawrence Livermore National Laboratory, Livermore, CA 94550, USA)
Mr
Junji KAWANAKA
(Institute of Laser Engineering, Osaka University, 2-6 Yamada-oka, Suita, Osaka 565-0871, Japan)
Prof.
Mitsuo Nakai
(Institute of Laser Engineering, Osaka University, 2-6 Yamada-oka, Suita, Osaka 565-0871, Japan)
Prof.
Noriaki MIYANAGA
(Institute of Laser Engineering, Osaka University, 2-6 Yamada-oka, Suita, Osaka 565-0871, Japan)
Dr
Shinsuke Fujioka
(Institute of Laser Engineering, Osaka University)
Dr
TOMOYUKI JOHZAKI
(Graduate School of Engineering, Hiroshima University)
Prof.
Takahisa JITSUNO
(Institute of Laser Engineering, Osaka University, 2-6 Yamada-oka, Suita, Osaka 565-0871, Japan)
Dr
Tetsuo OZAKI
(National Institute for Fusion Science, LHD, High Temperature Plasma G. 322-6 Oroshi Toki, Gifu 509-5292, Japan)
Dr
Yasunobu Arikawa
(Insituteof Laser Engineering Osaka University)
Mr
Yoshiki NAKATA
(Institute of Laser Engineering, Osaka University, 2-6 Yamada-oka, Suita, Osaka 565-0871, Japan)
Dr
hui Chen
(Lawrence Livermore National Laboratory, Livermore, CA 94550, USA)
Dr
morace Alessio
(Institute of Laser Engineering, Osaka University, 2-6 Yamada-oka, Suita, Osaka 565-0871, Japan)
Mr
sadaoki kojima
(Institute of Laser Engineering, Osaka University, 2-6 Yamada-oka, Suita, Osaka 565-0871, Japan)
