Estimation of a Plasma Mirror Reflectivity of LFEX Laser and Relevant Results Using Electron Energy Spectrometers

Tetsuo OZAKI; Eisuke MIURA; Sadaoki KOJIMA; Yasunobu ARIKAWA; Yuuki ABE; Kohei YAMANOI; Tomokazu IKEDA; Katsuhiro ISHII; Atsushi SUNAHARA; Tomoyuki JOHZAKI; Hiroshi SAWADA; Shinsuke FUJIOKA; Hitoshi SAKAGAMI; Yoneyoshi KITAGAWA; Yoshitaka MORI

doi:10.1585/pfr.17.2404084

Regular Articles

Estimation of a Plasma Mirror Reflectivity of LFEX Laser and Relevant Results Using Electron Energy Spectrometers

Tetsuo OZAKI, Eisuke MIURA, Sadaoki KOJIMA, Yasunobu ARIKAWA, Yuuki ABE, Kohei YAMANOI, Tomokazu IKEDA, Katsuhiro ISHII, Atsushi SUNAHARA, Tomoyuki JOHZAKI, Hiroshi SAWADA, Shinsuke FUJIOKA, Hitoshi SAKAGAMI, Yoneyoshi KITAGAWA, Yoshitaka MORI

Author information

Tetsuo OZAKI
National Institute for Fusion Science
Eisuke MIURA
National Institute of Advanced Industrial Science and Technology
Sadaoki KOJIMA
National Institutes for Quantum and Radiological Science and Technology
Yasunobu ARIKAWA
Institute of Laser Engineering, Osaka University
Yuuki ABE
Institute of Laser Engineering, Osaka University
Kohei YAMANOI
Institute of Laser Engineering, Osaka University
Tomokazu IKEDA
Institute of Laser Engineering, Osaka University
Katsuhiro ISHII
The Graduate School for the Creation of New Photonics Industries
Atsushi SUNAHARA
Purdue University
Tomoyuki JOHZAKI
Hiroshima University
Hiroshi SAWADA
University of Nevada
Shinsuke FUJIOKA
Institute of Laser Engineering, Osaka University
Hitoshi SAKAGAMI
National Institute for Fusion Science
Yoneyoshi KITAGAWA
The Graduate School for the Creation of New Photonics Industries
Yoshitaka MORI
The Graduate School for the Creation of New Photonics Industries

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

JOURNAL FREE ACCESS

2022 Volume 17 Pages 2404084

DOI https://doi.org/10.1585/pfr.17.2404084

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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 (T_e_ff) were measured by using electron energy spectrometers. T_e_ffvs 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 T_e_ffand estimating the focusing radius from the X-ray pinhole camera image. As a result, the reflectivity could be estimated to be 17±3%.

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