Plasma and Fusion Research

Volume 17, 2404084 (2022)

Regular Articles

Estimation of a Plasma Mirror Reflectivity of LFEX Laser and Relevant Results Using Electron Energy Spectrometers
Tetsuo OZAKI, Eisuke MIURA1), Sadaoki KOJIMA2), Yasunobu ARIKAWA3), Yuuki ABE3), Kohei YAMANOI3), Tomokazu IKEDA3), Katsuhiro ISHII4), Atsushi SUNAHARA5), Tomoyuki JOHZAKI6), Hiroshi SAWADA7), Shinsuke FUJIOKA3), Hitoshi SAKAGAMI, Yoneyoshi KITAGAWA4) and Yoshitaka MORI4)
National Institute for Fusion Science, 322-6 Oroshi, Toki, Gifu 509-5292, Japan
1)
National Institute of Advanced Industrial Science and Technology, 1-1-1 Umezono, Tsukuba, Ibaraki 305-8560, Japan
2)
National Institutes for Quantum and Radiological Science and Technology, 8-1-7 Umemidai, Kizugawa-shi, Kyoto 619-0215, Japan
3)
Institute of Laser Engineering, Osaka University, 2-6 Yamada-oka, Suita, Osaka 565-0871, Japan
4)
The Graduate School for the Creation of New Photonics Industries, 1955-1 Kurematsu-cho, Nishi-ku, Hamamatsu, Shizuoka 431-1202, Japan
5)
Purdue University, 610 Purdue Mall, West Lafayette, IN, 47907, United States
6)
Hiroshima University, 1-3-2 Kagamiyama, Higashihiroshima, Hiroshima 739-8511, Japan
7)
University of Nevada, Reno, 1664 N. Virginia Street, Reno, NV 89557, United States
(Received 10 January 2022 / Accepted 17 May 2022 / Published 22 June 2022)

Abstract

In the counter-irradiation, which is one of the fast ignition schemes, higher core energy coupling can be expected when there are two hot electron flows in counter directions. Two plasma mirrors were installed for the counter irradiation at about 180 degrees. The hot electron effective temperatures (Teff) were measured by using electron energy spectrometers. Teff vs the laser intensity on a foil target followed Wilkes' scaling law. The energy incident on the target could be calculated by estimating the laser intensity on the target from Teff and estimating the focusing radius from the X-ray pinhole camera image. As a result, the reflectivity could be estimated to be 17 ± 3%.

Keywords

plasma mirror, ESM, Wilks' scaling, LFEX, effective temperature, counter irradiation, fast ignition

DOI: 10.1585/pfr.17.2404084

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