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Effects of Neutral Particles on the Stability of the Detachment Fronts in Divertor Plasmas

Satoshi TOGO, Makoto NAKAMURA¹⁾, Yuichi OGAWA, Katsuhiro SHIMIZU²⁾, Tomonori TAKIZUKA³⁾ and Kazuo HOSHINO¹⁾

Graduate School of Frontier Sciences, University of Tokyo, 5-1-5 Kashiwanoha, Kashiwa, Chiba 277-8568, Japan

1)

Japan Atomic Energy Agency, 2-166 Oaza-Obuchi-Aza-Omotedate, Rokkasho, Kamikita, Aomori 039-3212, Japan

2)

Japan Atomic Energy Agency, 801-1 Mukoyama, Naka, Ibaraki 311-0193, Japan

3)

Graduate School of Engineering, Osaka University, 2-1 Yamadaoka, Suita, Osaka 565-0871, Japan

(Received 7 December 2012 / Accepted 22 May 2013 / Published 15 August 2013)

Abstract

Operation with detached divertor plasmas is considered to be a hopeful way in order to reduce the divertor heat load in the next generation tokamaks. The physical mechanism of detached divertor plasmas, however, has not fully been understood yet. We have studied them with a one-dimensional divertor model. Detached divertor plasmas have been successfully reproduced by introducing a self-consistent neutral model. The flows of particles and heat from the core plasma were investigated in the detached regime. Also investigated were the conditions of the recycling rate and neutral loss time constant where the detached regime occurred.

Copyright (c) 2013 The Japan Society of Plasma Science and Nuclear Fusion Research

Keywords

divertor heat load, detached divertor plasma, detachment front, plasma fluid model, self-consistent neutral model, recycling rate, neutral loss

DOI: 10.1585/pfr.8.2403096

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This paper may be cited as follows:

Satoshi TOGO, Makoto NAKAMURA, Yuichi OGAWA, Katsuhiro SHIMIZU, Tomonori TAKIZUKA and Kazuo HOSHINO, Plasma Fusion Res. 8, 2403096 (2013).