Operation of ICRF antennas in a full tungsten environment in ASDEX Upgrade

被引：15

作者：

Bobkov, Vl. ^{[1
]}

Braun, F. ^{[1
]}

Dux, R. ^{[1
]}

Giannone, L. ^{[1
]}

Herrmann, A. ^{[1
]}

Kallenbach, A. ^{[1
]}

Mueller, H. W. ^{[1
]}

Neu, R. ^{[1
]}

Noterdaeme, J. -M. ^{[1
]}

Puetterich, Th. ^{[1
]}

Rohde, V. ^{[1
]}

机构：

[1] MPI Plasmaphys, D-85748 Garching, Germany

来源：

JOURNAL OF NUCLEAR MATERIALS | 2009年 / 390-91卷

关键词：

PLASMA-FACING COMPONENTS; ALCATOR C-MOD; TOKAMAK; LIMITERS; DIVERTOR;

D O I：

10.1016/j.jnucmat.2009.01.231

中图分类号：

T [工业技术];

学科分类号：

08 ;

摘要：

In the 2007 and early part of 2008 experimental campaigns, ASDEX Upgrade operated with full tungsten (W) wall without boronization. Use of ICRF power results in a significant increase of W source. Low temperature conditions at the plasma facing components, achieved by a large clearance between the separatrix and the antenna (>6 cm) and by elevated gas puff rates (> 5 x 10(21) s(-1)) help to lower W sputtering yield during ICRF. Operation of neighboring ICRF antennas at the phase difference close to -90 degrees can lead to a reduction in the W source, However, a reduction of parallel near-fields by antenna design is needed to further minimize the W source. A relation has been established between the HFSS code calculations predicting a dominant role of box currents in the formation of parallel antenna near-fields and the experiment. The shapes of the measured vertical profile of effective sputtering yields and the calculated sheath driving voltages show a qualitative agreement. This confirms that the existing tools are a good basis to design an improved antenna. (C) 2009 Elsevier B.V. All rights reserved.

引用

页码：900 / 903

页数：4

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