[Table of Contents]

Plasma and Fusion Research

Volume 5, S2098 (2010)

Regular Articles

Calibration of Compact Electron Spectrometer for the FIREX-I Project in Gekko XII
Tetsuo OZAKI, Mayuko KOGA1), Hiroyuki SHIRAGA1), Ryuko KATO2), Shigeru KASHIWAGI2), Goro ISOYAMA2), Hitoshi SAKAGAMI and FIREX GROUP1)
National Institute for Fusion Science, 322-6 Oroshi-cho, Toki 509-5292, Japan
1)
Institute of Laser Engineering, Osaka University, 2-6 Yamadaoka, Suita 565-0871, Japan
2)
Institute of Scientific and Industrial Research, Osaka University, 8-1 Mihogaoka, Ibaraki 567-0047, Japan
(Received 19 December 2009 / Accepted 23 March 2010 / Published 10 December 2010)

Abstract

We have developed a compact electron spectrometer (ESM) to investigate ignition mechanism in the Fast Ignition Realization Experiment project. Hot electrons, produced by the irradiation of a gold target by using a compressed chirped pulse laser, are used for auxiliary heating of the imploded core. An imaging plate is used as the electron detector for medical purposes. However, the relationship between the beam intensity and the detector signal is not clear. The ESM should be calibrated because it is highly compact and has a complex magnetic field for bending caused by installation in a limited space. We have performed the calibration by using an L-band LINAC at the Institute of Scientific and Industrial Research, Osaka University, in order to obtain an accurate electron spectrum. The calibration used a single electron pulse at two different energies, 9.5 MeV and 27.1 MeV, with 0.1-10 pC. The energy spreads are 0.2 MeV at 9.5 MeV and 0.3 MeV at 27.1 MeV. The analyzer has been tested to measure energetic electrons from plain and integrated targets irradiated by the Laser or Fast Ignition Experiment (maximum energy of 10 kJ) up to 800 J.

Keywords

ESM, calibration, LINAC, electron, FIREX, IP, Gekko XII, LFEX, energy spectrum

DOI: 10.1585/pfr.5.S2098

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This paper may be cited as follows:

Tetsuo OZAKI, Mayuko KOGA, Hiroyuki SHIRAGA, Ryuko KATO, Shigeru KASHIWAGI, Goro ISOYAMA, Hitoshi SAKAGAMI and FIREX GROUP, Plasma Fusion Res. 5, S2098 (2010).