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Divertor Simulation Study Using the GAMMA 10 End-Mirror Cell

Hisato TAKEDA, Yousuke NAKASHIMA, Katsuhiro HOSOI, Kazuya ICHIMURA, Tetsuro FURUTA¹⁾, Kazuhiko HIGASHIYAMA¹⁾, Mitunori TOMA¹⁾, Akiyoshi HATAYAMA¹⁾, Takashi ISHII, Hideaki UEDA, Mizuki SAKAMOTO, Makoto ICHIMURA, Masayuki YOSHIKAWA, Junko KOHAGURA and Tsuyoshi IMAI

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

1)

Science and Technology, Keio University, Hiyoshi, Yokohama 223-8522, Japan

(Received 11 December 2011 / Accepted 3 August 2012 / Published 22 November 2012)

Abstract

In GAMMA 10 which is a tandem mirror machine in Plasma Research Center at University of Tsukuba, divertor simulation studies have been planned and started. This paper describes the recent results of divertor simulation experiment in the GAMMA 10 end-mirror cell. As a part of these experiments, characteristics of end-loss plasma have been investigated by using probes and calorimeters. The diagnostics are installed at two positions, which are separated by 40 cm in the axial direction. In the results, ion temperature of the end-loss flux in GAMMA 10 is much higher than that of other divertor simulators. It is found that heat-flux density can be controlled within the range from 0.4 to 0.8 MW/m² by changing the ICRF power. In addition, heat flux density has strong dependence on diamagnetism in the central-cell which is time integrated in the plasma duration. While, particle-flux density is proportional to electron line-density in the central-cell. Particle and heat fluxes measured at axially different positions agree well with the calculation results for considering the influence of particle reflection phenomena.

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

Keywords

divertor simulation, GAMMA 10, tandem mirror, probe, calorimeter, heat flux, particle flux

DOI: 10.1585/pfr.7.2405151

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This paper may be cited as follows:

Hisato TAKEDA, Yousuke NAKASHIMA, Katsuhiro HOSOI, Kazuya ICHIMURA, Tetsuro FURUTA, Kazuhiko HIGASHIYAMA, Mitunori TOMA, Akiyoshi HATAYAMA, Takashi ISHII, Hideaki UEDA, Mizuki SAKAMOTO, Makoto ICHIMURA, Masayuki YOSHIKAWA, Junko KOHAGURA and Tsuyoshi IMAI, Plasma Fusion Res. 7, 2405151 (2012).