Comparison of JET inner wall erosion in the first three ITER-like wall campaigns

被引：7

作者：

Krat, S. ^{[1
,2
]}

Mayer, M. ^{[2
]}

Coad, J. P. ^{[3
]}

Lungu, C. P. ^{[4
]}

Heinola, K. ^{[5
]}

Baron-Wiechec, A. ^{[6
]}

Jepu, I ^{[4
]}

Widdowson, A. ^{[3
]}

机构：

[1] Natl Res Nucl Univ MEPhI, Moscow, Russia

[2] Max Planck Inst Plasma Phys, Garching, Germany

[3] Culham Ctr Fus Energy, Culham Sci Ctr, Abingdon, Oxon, England

[4] Natl Inst Laser Plasma & Radiat Phys, Bucharest, Romania

[5] IAEA, Vienna Int Ctr, POB 100, A-1400 Vienna, Austria

[6] Guangdong Technion Israel Inst Technol, Shantou 515063, Peoples R China

来源：

NUCLEAR MATERIALS AND ENERGY | 2021年 / 29卷

基金：

俄罗斯科学基金会;

关键词：

Tokamak; Plasma-wall Interaction; Erosion; JET-ILW; Ion beam analysis; DEPOSITION; TRANSPORT;

D O I：

10.1016/j.nme.2021.101072

中图分类号：

TL [原子能技术]; O571 [原子核物理学];

学科分类号：

0827 ; 082701 ;

摘要：

The net erosion of material from recessed areas of the JET main chamber inner wall during the first three ITERlike wall (JET-ILW) campaigns was studied using long-term samples with Be and W marker layers. The samples were analyzed using elastic backscattering spectrometry (EBS) before and after each campaign. It was found that the erosion for both Be and W was roughly homogeneously distributed in both toroidal and poloidal directions, possibly with a small maximum near the middle of the inner wall and a minimum near the bottom of the wall, as well as several toroidal distribution features. The net erosion rate of Be decreased by a factor of two between the first and the second JET-ILW campaigns, and remained unchanged during the third JET-ILW campaign. Three possible explanations are presented: a campaign to test the power handling capability of the limiter in ILW1, a change in incident particle energy distribution, and a change in limiter to divertor discharge time ratio. The net erosion rate of W remained almost unchanged through the first two JET-ILW campaigns. In the third JET-ILW campaign the net erosion rate of W from the inner wall was about 1.6 times higher than previously observed, indicating a change in the energy spectrum of particles eroding the inner wall, and the occasional addition of Kr and Xe to the fuelling.

引用

页数：6

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