Speaker
Prof.
Hiroyuki Shiraga
(Institute of Laser Engineering, Osaka University)
Description
Fast ignition (FI) experiments have been performed at the Institute of Laser Engineering, Osaka University by using Gekko-XII laser for implosion and LFEX laser for fast heating of fuel targets. In FI experiment with intense heating laser irradiation (>10^19 W/cm2), most of heating laser energy is converted to that of hot electrons with energy ranging well up to several 10 MeV. Intense hard x-rays (or so-called “γ rays” in terms of the photon energy) are generated from hot electrons via Bremsstrahlung in the target material. Such high-energy photons are a real threat as intense background signals to the x-ray and neutron diagnostics. Neutrons generated via (γ,n) reactions taking place in and around the target chamber are also a threat to the neutron diagnostics. We found that FI experiments are in such a γ-ray and neutron harsh environment, and evaluated those conditions which have never been experienced in conventional laser-plasma experiments. We have developed many new plasma diagnostics that are compatible with such a γ -ray and neutron harsh environment. FI physics- and integrated-experiments have been successfully performed with those improved plasma diagnostics with much better accuracy than in the previous experiments even in such a γ-ray and neutron harsh environment. These works are also useful as test pilot experiments for future experimental fusion reactors in which much more harsh environment is anticipated.
| Country or International Organisation | Japan |
|---|---|
| Paper Number | IFE/P6-3 |
Primary author
Prof.
Hiroyuki Shiraga
(Institute of Laser Engineering, Osaka University)
Co-authors
Prof.
Hiroaki Nishimura
(Institute of Laser Engineering, Osaka University)
Prof.
Hiroshi AZECHI
(Institute of Laser Engineering, Osaka University)
Prof.
Koga Mayuko
(University of Hyogo)
Prof.
Mitsuo Nakai
(Institute of Laser Engineering, Osaka University)
Prof.
Shinsuke Fujioka
(Institute of Laser Engineering, Osaka University)
Prof.
Tetsuo Ozaki
(National Institute for Fusion Science)
Dr
Yasunobu Arikawa
(Insituteof Laser Engineering Osaka University)
