Erosion and redeposition patterns on entire erosion marker tiles after exposure in the first operation phase of WEST

被引：31

作者：

Balden, M. ^{[1
]}

Mayer, M. ^{[1
]}

Bliewert, B. ^{[1
]}

Bernard, E. ^{[2
]}

Diez, M. ^{[2
]}

Firdaouss, M. ^{[2
]}

Missirlian, M. ^{[3
]}

Pegourie, B. ^{[2
]}

Richou, M. ^{[2
]}

Roche, H. ^{[2
]}

Tsitrone, E. ^{[2
]}

Martin, C. ^{[3
]}

Hakola, A. ^{[4
]}

机构：

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

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

[3] Aix Marseille Univ, CNRS, PIIM UMR 7345, F-13397 Marseille, France

[4] VTT Tech Res Ctr Finland Ltd, POB 1000, FI-02044 Espoo, Finland

来源：

PHYSICA SCRIPTA | 2021年 / 96卷 / 12期

关键词：

plasma-wall interaction; WEST; erosion and deposition; RBS and NRA; SEM and EDX; tungsten fuzz; arcing; TUNGSTEN; DIVERTOR;

D O I：

10.1088/1402-4896/ac2182

中图分类号：

O4 [物理学];

学科分类号：

0702 ;

摘要：

The net erosion and deposition patterns in the inner and outer divertor of WEST were determined after different experimental campaigns (C3 and C4) of the first operational phase using ion beam analyses and scanning electron microscopy techniques. The analyses were performed on four entire tiles from inertially cooled, W-coated divertor units with an additional Mo marker coating covered with a further W coating. Strong erosion occurred at the expected location of the inner and outer strike line area with a campaign-averaged net erosion rate of >0.1 nm s(-1). On the high field side of the inner strike line area, thick deposited layers were found (>10 mu m; growth rate >1 nm s(-1)), mainly composed of B, C, O, and W. Additionally, strong arcing was observed in this region. At the end of the C4 campaign, He discharges were performed to study the He-W interaction. Although the conditions for nanotendrils, i.e. fuzz formation were fulfilled around the outer strike line position, neither nanotendrils nor He bubbles (>10 nm) were observed at this area.

引用

页数：9

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