Wall conditioning at the Wendelstein 7-X stellarator operating with a graphite divertor

被引：25

作者：

Goriaev, A. ^{[1
,2
]}

Wauters, T. ^{[1
]}

Brakel, R. ^{[3
]}

Brezinsek, S. ^{[4
]}

Dinklage, A. ^{[3
]}

Fellinger, J. ^{[3
]}

Grote, H. ^{[3
]}

Moseev, D. ^{[3
]}

Sereda, S. ^{[4
]}

Volzke, O. ^{[3
]}

机构：

[1] KMS, ERM, LPP, Brussels, Belgium

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

[3] Max Planck Inst Plasma Phys, Greifswald, Germany

[4] Forschungszentrum Julich, Inst Energy & Climate Res Plasma Phys, Julich, Germany

来源：

PHYSICA SCRIPTA | 2020年 / T171卷 / 01期

关键词：

W7-X; wall conditioning; He pulse train; boronisation; GDC; baking; ECWC; GLOW-DISCHARGE; SYSTEM; W7-X;

D O I：

10.1088/1402-4896/ab60fa

中图分类号：

O4 [物理学];

学科分类号：

0702 ;

摘要：

Wall conditioning plays an important role in achieving record plasma performance on the superconducting stellarator Wendelstein 7-X (W7-X) by controlling plasma density and maintaining low levels of impurities. The development of the optimal wall conditioning strategy is of high importance for successful operation of the W7-X with a graphite divertor. The current strategy consists of initial wall conditioning applied prior to a physics experimental program and wall conditioning techniques executed during the plasma operation phase. The combination of baking and glow discharge cleaning provides a fast start to reliable plasma operation. Regular boronisation opens a new operational window of high plasma densities above 1 * 10(20) m(-3). Strong wall fueling remains, however, one of the main issues preventing plasma density control. A reliable solution is provided by application of He electron cyclotron resonance heating pulse trains, which are optimised to maximise fuel removal.

引用

页数：7

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