Making ICRF power compatible with a high-Z wall in the ASDEX Upgrade

被引：57

作者：

Bobkov, V. ^{[1
]}

Aguiam, D. ^{[2
]}

Bilato, R. ^{[1
]}

Brezinsek, S. ^{[3
]}

Colas, L. ^{[4
]}

Faugel, H. ^{[1
]}

Fuenfgelder, H. ^{[1
]}

Herrmann, A. ^{[1
]}

Jacquot, J. ^{[1
]}

Kallenbach, A. ^{[1
]}

Milanesio, D. ^{[5
]}

Maggiora, R. ^{[5
]}

Neu, R. ^{[1
,6
]}

Noterdaeme, J-M ^{[1
,7
]}

Ochoukov, R. ^{[1
]}

Potzel, S. ^{[1
]}

Puetterich, T. ^{[1
]}

Silva, A. ^{[2
]}

Tierens, W. ^{[1
]}

Tuccilo, A. ^{[8
]}

Tudisco, O. ^{[8
]}

Wang, Y. ^{[9
]}

Yang, Q. ^{[9
]}

Zhang, W. ^{[1
]}

机构：

[1] Max Planck Inst Plasma Phys, Boltzmannstr 2, D-85748 Garching, Germany

[2] Univ Lisbon, Inst Plasmas & Fusao Nucl, Inst Super Tecn, P-1049001 Lisbon, Portugal

[3] Forschungszentrum Julich GmbH, Inst Energie & Klimaforsch, Plasmaphys, Partner Trilateral Euregio Cluster TEC, D-52425 Julich, Germany

[4] Assoc EUROFUSION CEA, IRFM, St Paul Les Durance, France

[5] Politecn Torino, Turin, Italy

[6] Tech Univ Munich, Boltzmannstr 15, D-85748 Garching, Germany

[7] Univ Ghent, Dept Appl Phys, Ghent, Belgium

[8] ENEA, Frascati, Italy

[9] Chinese Acad Sci, ASIPP, Inst Plasma Phys, Hefei, Peoples R China

来源：

PLASMA PHYSICS AND CONTROLLED FUSION | 2017年 / 59卷 / 01期

关键词：

ICRF; RF sheath; antenna; W sputtering; TOPICA; SSWICH; ASDEX Upgrade; RETARDING-FIELD ANALYZER; SHEATHS;

D O I：

10.1088/0741-3335/59/1/014022

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：

A comparison of the ASDEX Upgrade 3-strap ICRF antenna data with the linear electromagnetic TOPICA calculations is presented. The comparison substantiates a reduction of the local electric field at the radially protruding plasma-facing elements of the antenna as a relevant approach for minimizing tungsten (W) sputtering in conditions when the slow wave is strongly evanescent. The measured reaction of the time-averaged RF current at the antenna limiters to the antenna feeding variations is less sensitive than predicted by the calculations. This is likely to have been caused by temporal and spatial fluctuations in the 3D plasma density distribution affected by local non-linear interactions. The 3-strap antenna with the W-coated limiters produces drastically less W sputtering compared to the W-coated 2-strap antennas. This is consistent with the non-linear asymptotic SSWICH-SW calculations for RF sheaths.

引用

页数：11

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