[Table of Contents]

Plasma and Fusion Research

Volume 5, S2084 (2010)

Regular Articles


Evaluation of the Heating Effect in Neutral Beam Injection Experiments of the GAMMA 10 Tandem Mirror
Hiroki OZAWA, Yousuke NAKASHIMA, Ryou YONENAGA, Katsuhiro HOSOI, Takashi ISHII, Hisato TAKEDA, Kazuo OKAWA and Tsuyoshi IMAI
Plasma Research Center, University of Tsukuba, 1-1-1 Tennoudai, Tsukuba, Ibaraki 305-8577, Japan
(Received 7 December 2009 / Accepted 7 May 2010 / Published 10 December 2010)

Abstract

Neutral beam injection heating has been studied for high-density mode plasma in the GAMMA 10 tandem mirror. During NBI heating, the increase in diamagnetism was found to be larger for the high-density mode plasma than the hot-ion mode plasma. A numerical model using zero-dimensional particles and energy balance equations was developed to investigate NBI heating in the central cell area. The evolution of total energy density was found to be consistent with that of diamagnetism in the low-density hot-ion mode. The initial ion temperature is a key parameter for enhancing beam heating. In high-density mode, discrepancies were found between the measured diamagnetism and the calculated total energy density. It is probably because that time behavior of the electron temperature is not suitable.


Keywords

NBI, GAMMA 10, tandem mirror, hot-ion mode, high-density mode

DOI: 10.1585/pfr.5.S2084


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This paper may be cited as follows:

Hiroki OZAWA, Yousuke NAKASHIMA, Ryou YONENAGA, Katsuhiro HOSOI, Takashi ISHII, Hisato TAKEDA, Kazuo OKAWA and Tsuyoshi IMAI, Plasma Fusion Res. 5, S2084 (2010).