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Analysis of End-Loss Ion Flux for Application Studies of the Plasma Flow from the End Mirror Exit of GAMMA 10

Kazuya ICHIMURA, Yousuke NAKASHIMA, Katsuhiro HOSOI, Hisato TAKEDA, Takashi ISHII, Hideaki UEDA, Satoshi KIGURE, Shigehito TAKAHASHI, Satoru HOTAKA, Makoto ICHIMURA, Ryuya IKEZOE, Masayuki YOSHIKAWA, Mizuki SAKAMOTO and Tsuyoshi IMAI

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

(Received 9 December 2011 / Accepted 3 August 2012 / Published 22 November 2012)

Abstract

The end-loss ion flux in GAMMA 10 is measured with a view to use it for a divertor simulation experiment or other studies that require high-performance plasma flux. First, the basic parameters of the end-loss ion flux, such as its energy and current density, were measured in typical plasma shots in GAMMA 10. A diagnostic device, the end loss ion energy analyzer (ELIEA), was used to the measure these parameters. An investigation of the relationship between the parameters of the end-loss ion flux and the plasma parameters in the central- cell revealed linear-like relationships between these parameters. We also analyzed the effects of plasma heating and fueling by using devices installed in GAMMA 10 (ion cyclotron resonance frequency (ICRF), electron cyclotron resonance heating (ECRH) and supersonic molecular beam injection (SMBI)) in order to generate more intense ion flux. The results showed that the energy distribution of the ion flux is more closely resembles a double component Maxwellian than a simple Maxwellian. Plasma heating schemes such as ECRH and ICRF are found to be effective for the generation of a more intense ion flux.

Copyright (c) 2012 The Japan Society of Plasma Science and Nuclear Fusion Research

Keywords

tandem mirror, end loss, ion flux

DOI: 10.1585/pfr.7.2405147

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This paper may be cited as follows:

Kazuya ICHIMURA, Yousuke NAKASHIMA, Katsuhiro HOSOI, Hisato TAKEDA, Takashi ISHII, Hideaki UEDA, Satoshi KIGURE, Shigehito TAKAHASHI, Satoru HOTAKA, Makoto ICHIMURA, Ryuya IKEZOE, Masayuki YOSHIKAWA, Mizuki SAKAMOTO and Tsuyoshi IMAI, Plasma Fusion Res. 7, 2405147 (2012).