Energy distribution of fast electrons accelerated by high intensity laser pulse depending on laser pulse duration

9th International Conference on Inertial Fusion Sciences and Applications

Kojima, Sadaoki^1 ; Arikawa, Yasunobu^1 ; Morace, Alessio^1 ; Hata, Masayasu^1 ; Nagatomo, Hideo^1 ; Ozaki, Tetsuo^2 ; Sakata, Shohei^1 ; Lee, Seung Ho^1 ; Matsuo, Kazuki^1 ; Law, King Fai Farley^1 ; Tosaki, Shota^1 ; Yogo, Akifumi^1 ; Johzaki, Tomoyuki^3 ; Sunahara, Atsushi^4 ; Sakagami, Hitoshi^2 ; Nakai, Mitsuo^1 ; Nishimura, Hiroaki^1 ; Shiraga, Hiroyuki^1 ; Fujioka, Shinsuke^1 ; Azechi, Hiroshi^1

Institute of Laser Engineering, Osaka University, 2-6 Yamada-oka, Suita Osaka

565-0871, Japan^1

National Institute for Fusion Science, 322-6, Oroshi, Toki, Gifu

509-5292, Japan^2

Hiroshima Univ., 1-4-1, Kagamiyama, Higashi-Hiroshima

739-8527, Japan^3

Institute for Laser Technology, 2-6 Yamada-oka, Suita Osaka

565-0871, Japan^4

关键词: Energy distributions;    Fast electron generation;    High intensity laser pulse;    High-energy electron;    Intense laser pulse;    Laser pulse duration;    Pulse duration effects;    Temperature increment;   

Others  :  https://iopscience.iop.org/article/10.1088/1742-6596/717/1/012102/pdf
DOI  :  10.1088/1742-6596/717/1/012102

来源: IOP

【 摘 要 】

The dependence of high-energy electron generation on the pulse duration of a high intensity LFEX laser was experimentally investigated. The LFEX laser (λ = 1.054 and intensity = 2.5 - 3 x 1018W/cm2) pulses were focused on a 1 mm3gold cubic block after reducing the intensities of the foot pulse and pedestal by using a plasma mirror. The full width at half maximum (FWHM) duration of the intense laser pulse could be set to either 1.2 ps or 4 ps by temporally stacking four beams of the LFEX laser, for which the slope temperature of the high-energy electron distribution was 0.7 MeV and 1.4 MeV, respectively. The slope temperature increment cannot be explained without considering pulse duration effects on fast electron generation.