[Table of Contents]

Plasma and Fusion Research

Volume 2, S1092 (2007)

Regular Articles

Calibrations of Fast Ion Flux Measurement Using a Hybrid Directional Probe
Kenichi NAGAOKA, Mitsutaka ISOBE, Kazuo TOI, Kazuyuki GOTO1), Masaki OSAKABE, Tsuyoshi AKIYAMA, Chihiro SUZUKI, Shin NISHIMURA, Yasuhiko TAKEIRI, Kiyomasa Y. WATANABE, Keisuke MATSUOKA, Shoichi OKAMURA and CHS experimental group
National Institute for Fusion Science, Toki 509-5292, Japan
1)
Nagoya University, Nagoya 464-8603, Japan
(Received 11 December 2006 / Accepted 27 April 2007 / Published 20 November 2007)

Abstract

A hybrid directional probe method both “thermal and Langmuir probe” was applied for fast ion measurements in the compact helical system. In order to obtain absolute values of fast ion density and power density, a calibration of the probe was performed using neutral hydrogen beam and a mixture beam of hydrogen and proton, of which beam current and energy were controlled. The conversion factor from temperature increase of the probe head to local power density and secondary electron emission yield was obtained. The density of fast ions was obtained by directional thermal probe (DTP) method inside the last closed flux surface, and the density ratio was nFastIon/nBulkPlasma = 2.7 × 10-3 at r/a = 0.9. The observation of the directional Langmuir probe (DLP) method is consistent with the DTP results.

Keywords

directional probe method, directional thermal probe, directional Langmuir probe, fast ion measurement, heat flux, particle flux

DOI: 10.1585/pfr.2.S1092

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References

  • [1] W.W. Heidbrink and G.J. Sadler, Nucl. Fusion 34, 535 (1994).
  • [2] Y. Todo, Phys. Plasmas 13, 082503 (2006).
  • [3] K. Toi et al., J. Plasma Fusion Res. SERIES 5, 50 (2002).
  • [4] K.L. Wong et al., Phys Rev. Lett. 66, 1874 (1991).
  • [5] A. Weller et al., Phys Rev. Lett. 72, 1220 (1994).
  • [6] M. Isobe et al., Nuclear Fusion 46, S918 (2006).
  • [7] K. Shinohara et al., Nucl. Fusion 42, 942 (2002).
  • [8] L. Chen, Phys. Plasmas 1, 1519 (1994).
  • [9] W.W. Heidbrink, Phys. Plasmas 9, 2113 (2002).
  • [10] P.C. Stangeby and J.E. Allen, J. Plasma Phys. 6, 2054 (1971).
  • [11] M. Hudis et al., J. Appl. Phys. 41, 5011 (1970).
  • [12] K. Nagaoka et al., J. Phys Soc. Jpn. 70, 131 (2001).
  • [13] A. Ando et al., J. Plasma Fusion Res. 81, 451 (2005).
  • [14] T. Shikama et al., J.J. Appl. Phys. 43, 809 (2004).
  • [15] K. Matsuoka et al., Plasma Physics and Controlled Nuclear Fusion Research 1988 (Proc. 12th Int. Conf. Nice, 1988), Vol. 2, IAEA, Vienna (1989) 411.
  • [16] K. Nagaoka et al., Plasma Fusion Res. 1, 005 (2006).

This paper may be cited as follows:

Kenichi NAGAOKA, Mitsutaka ISOBE, Kazuo TOI, Kazuyuki GOTO, Masaki OSAKABE, Tsuyoshi AKIYAMA, Chihiro SUZUKI, Shin NISHIMURA, Yasuhiko TAKEIRI, Kiyomasa Y. WATANABE, Keisuke MATSUOKA, Shoichi OKAMURA and CHS experimental group, Plasma Fusion Res. 2, S1092 (2007).