Plasma and Fusion Research

Volume 16, 2404076 (2021)

Regular Articles

Hot Electron and Ion Spectra in Axial and Transverse Laser Irradiation in the GXII-LFEX Direct Fast Ignition Experiment

Tetsuo OZAKI, Yuki ABE¹⁾, Yasunobu ARIKAWA¹⁾, Shinichirou OKIHARA²⁾, Eisuke MIURA³⁾, Atsushi SUNAHARA⁴⁾, Katsuhiro ISHII²⁾, Ryohei HANAYAMA²⁾, Osamu KOMEDA⁵⁾, Yasuhiko SENTOKU¹⁾, Akifumi IWAMOTO, Hitoshi SAKAGAMI, Tomoyuki JOHZAKI⁶⁾, Junji KAWANAKA¹⁾, Shigeki TOKITA¹⁾, Noriaki MIYANAGA¹⁾, Takahisa JITSUNO¹⁾, Yoshiki NAKATA¹⁾, Koji TSUBAKIMOTO¹⁾, Yoshitaka MORI²⁾ and Yoneyoshi KITAGAWA²⁾

: National Institute for Fusion Science, Toki 509-5292, Japan
1): Institute of Laser Engineering, Osaka University, Suita 565-0871, Japan
2): The Graduate School for the Creation of New Photonics Industries (GPI), Hamamatsu 431-1202, Japan
3): National Institute of Advanced Industrial Science and Technology, Tsukuba 305-8560, Japan
4): Purdue University, West Lafayette, IN, 47907, United States
5): Advanced Material Engineering Divison, TOYOTA Motor Corporation, Toyota 471-8571, Japan
6): Graduate School of Advanced Science and Engineering, Hiroshima University, Higashihiroshima 739-8527, Japan

(Received 12 November 2020 / Accepted 25 March 2021 / Published 7 June 2021)

Abstract

An electron spectrometer was used to measure the electron and ion spectra in two different irradiations of implosion laser to the deuterated spherical shell targets at the direct fast ignition experiments on the Gekko-LFEX facility. In the transverse irradiation against the LFEX laser axis, the low effective hot electron temperature (T_eff) and huge neutron yield (Ny) could be obtained although high T_eff and low Ny could be observed in the axial irradiation. In the transverse irradiation, the efficient core heating could be obtained because the laser-plasma interaction position is close to the core and the diffusive/ion drag heating may be effective.

Keywords

electron spectrometer, LFEX, GXII, neutron yield, coupling efficiency, deuteron, T_eff

DOI: 10.1585/pfr.16.2404076

Full Text

PDF format (392Kbytes) PDF Download

References

[1] M. Tabak et al., Phys. Plasmas 1, 1626 (1994).
[2] Y. Kitagawa et al., Phys. Rev. E 71, 016403 (2005).
[3] R. Kodama et al., Nature 418, 933 (2002).
[4] S. Sakata et al., Nature Com. 9, 3937 (2018).
[5] Y. Kitagawa et al., Plasma Fusion Res. 6, 1306006 (2011).
[6] S. Fujioka et al., Sci. Rep. 3, 1170 (2013).
[7] T. Ozaki et al., Physica Scripta 2014, T161, 014025 (2014).
[8] H. Shiraga et al., Plasma Phys. Control. Fussion 53, 124029 (2011).
[9] T. Ozaki et al., Rev. Sci. Instrum. 83, 10D920-1 (2012).
[10] Y. Abe et al., Rev. Sci. Instrum. 89, 110I114 (2018).
[11] E. Miura et al., HED Phys. 36, 100890 (2020).
[12] Y. Kitagawa et al., 3P20, IFSA2019.
[13] T. Ozaki et al., J. Phys. 717, 012043 (2016).
[14] Y. Abe et al., HED Phys. 36, 100803 (2020).
[15] A. Sunahara et al., J. Phys. 717(1), 012055 (2016).
[16] http://www.srim.org/
[17] N. Higashi et al., HED Phys. 36 100829 (2020).