Plasma and Fusion Research

Volume 7, 2403087 (2012)

Regular Articles

Effects of Radial Losses of Particle and Energy on the Stability of Detachment Front in a Divertor Plasma
Satoshi TOGO, Makoto NAKAMURA1), Yuichi OGAWA, Katsuhiro SHIMIZU2), Tomonori TAKIZUKA2) and Kazuo HOSHINO1)
Graduate School of Frontier Science, 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
(Received 9 December 2011 / Accepted 25 April 2012 / Published 26 July 2012)

Abstract

Operation under partially detached divertor (PDD) plasmas is a hopeful way in order to reduce the divertor heat load in the next generation tokamaks. The physical mechanism of PDD plasmas, however, has not fully been understood yet. We have studied them with a multi-layer one-dimensional divertor model. The PDD plasmas are successfully reproduced by introducing a neutral gas puffing model. Effect of the cross-field heat transport on the PDD plasmas is investigated. It is found that cross-field heat transport both in the SOL region and in the divertor region prevents detachment fronts from moving upstream in a detached flux tube.

Keywords

divertor heat load, partially detached divertor plasma, detachment front, plasma fluid model, neutral model, cross-field heat transport, thermal stability

DOI: 10.1585/pfr.7.2403087

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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. 7, 2403087 (2012).