Operational limits during high power long pulses with radiofrequency heating in Tore Supra

被引：23

作者：

Ekedahla, A. ^{[1
]}

Bucalossi, J. ^{[1
]}

Basiuk, V. ^{[1
]}

Bremond, S. ^{[1
]}

Colas, L. ^{[1
]}

Corre, Y. ^{[1
]}

Delchambre, E. ^{[1
]}

Douai, D. ^{[1
]}

Dumont, R. ^{[1
]}

Dunand, G. ^{[1
]}

Giruzzi, G. ^{[1
]}

Goniche, M. ^{[1
]}

Hong, S. ^{[1
]}

Imbeaux, F. ^{[1
]}

Kazarian, F. ^{[1
]}

Lombard, G. ^{[1
]}

Manenc, L. ^{[1
]}

Meyer, O. ^{[1
]}

Millon, L. ^{[1
]}

Mitteau, R. ^{[1
]}

Monier-Garbet, P. ^{[1
]}

Moreau, P. ^{[1
]}

Pegourie, B. ^{[1
]}

Rimini, F. G. ^{[1
]}

Saint-Laurent, F. ^{[1
]}

Samaille, F. ^{[1
]}

Schwob, J. L. ^{[1
]}

Tsitrone, E. ^{[1
]}

机构：

[1] IRFM, CEA, F-13108 St Paul Les Durance, France

来源：

NUCLEAR FUSION | 2009年 / 49卷 / 09期

关键词：

LHCD LAUNCHERS; RIPPLE LOSSES; WALL;

D O I：

10.1088/0029-5515/49/9/095010

中图分类号：

O35 [流体力学]; O53 [等离子体物理学];

学科分类号：

070204 ; 080103 ; 080704 ;

摘要：

Issues related to the limitations and optimization of long pulse operation at high radiofrequency (RF) power levels in the Tore Supra tokamak are presented. An increasing operational limitation was encountered during the experimental campaigns in 2006-2007, affecting the high power and long pulse performance. This limitation was characterized by the sudden appearance of a multifaceted asymmetric radiation from the edge (MARFE), often followed by a disruption. The analyses revealed that the limitation could be linked to over-heating and flaking of the carbon re-deposition layers on the main plasma facing components (PFCs). The carbon deposits on all PFCs were therefore completely removed during the winter shutdown 2007-2008. Following this, a remarkable improvement in the injected power capability was observed, resulting in almost 12 MW of injected power during 10 s, without any of the previous signs of limitation (MARFE, disruption). Furthermore, the RF antennas are subject to localized heat loads due to RF sheath effects and interaction by fast particles, effects which need to be minimized in particular for long pulse operation. Experimental results concerning the heat load on the antennas, caused by fast ion losses in the presence of magnetic ripple, are presented in this paper.

引用

页数：8

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