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Observation of the Pitch Angle Distribution of High-Energy Ions and their Radial Transport in the Central Cell of GAMMA10

Yasutaka IMAI, Makoto ICHIMURA, Ryuya IKEZOE, Tatsuya MURAKAMI, Toru IWAI, Takuro YOKOYAMA, Yumeto UGAJIN, Tatsunori SATO and Tsuyoshi IMAI

Plasma Research Center, University of Tsukuba, Tsukuba 305-8577, Japan

(Received 7 December 2010 / Accepted 8 March 2011 / Published 2 December 2011)

Abstract

Suppression of the radial transport of the particles caused by low-frequency density fluctuations is one of the important subjects in the GAMMA10 tandem mirror. In GAMMA10, plasmas are mainly produced and heated with Ion Cyclotron Range of Frequency (ICRF) waves. The plasmas heated with ICRF waves have strong temperature anisotropy, because the ions are accelerated perpendicularly to the magnetic field line. In the GAMMA10 experiments, two types of low-frequency density fluctuations are observed; one is a drift-type fluctuation and the other is a flute-type fluctuation. In this paper, we study the radial transport of ICRF-produced high-energy ions which is caused by the low-frequency density fluctuations.

Copyright (c) 2011 The Japan Society of Plasma Science and Nuclear Fusion Research

Keywords

tandem mirror, drift-type fluctuation, flute-type fluctuation, pitch angle distribution, radial transport

DOI: 10.1585/pfr.6.2402152

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References

• [1] M. Ichimura et al., Rev. Sci. Instrum. 70, 834 (1999)
• [2] M. Katano et al., Trans. of Fusion Sci. and Technol. 51, no.2T, 289 (2007).

This paper may be cited as follows:

Yasutaka IMAI, Makoto ICHIMURA, Ryuya IKEZOE, Tatsuya MURAKAMI, Toru IWAI, Takuro YOKOYAMA, Yumeto UGAJIN, Tatsunori SATO and Tsuyoshi IMAI, Plasma Fusion Res. 6, 2402152 (2011).