Influence of Erosion and Deposition on Metallic First Mirror in HT-7 Tokamak

被引：8

作者：

Chen Ju ^{[1
]}

Yan Rong ^{[1
]}

Chen Junling ^{[1
]}

机构：

[1] Chinese Acad Sci, Inst Plasma Phys, Hefei 230031, Peoples R China

来源：

PLASMA SCIENCE & TECHNOLOGY | 2012年 / 14卷 / 08期

关键词：

first mirror; erosion; deposition; reflectivity; surface morphology; DIVERTOR; TESTS;

D O I：

10.1088/1009-0630/14/8/05

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：

Dedicated experiments in the HT-7 tokamak were performed to investigate the influence of erosion and deposition on the mirror samples. The first mirror (FM) samples made of polycrystalline (PC) stainless steel (SS), molybdenum (Mo) and tungsten (W) were fixed on a holder at an angle of 45 degrees with respect to the horizontal plane and set at different locations with different connection lengths along the magnetic field. The optical reflectivity of the first mirror was measured by a spectrophotometer before and after plasma exposure. It was found that the surface morphology and specular reflectivity of the mirror samples after the exposure were different with respect to the different distances from the mirror surface to the last closed flux surface (LCFS) of the plasma in the tokamak. It was also found that shortening the connection length before the mirror surface would weaken the influence of the plasma erosion and impurity deposition on the mirror surface. In order to maintain the optical characteristics of the mirror surface, it is necessary to adopt the in-situ cleaning and mirror protection techniques.

引用

页码：708 / 711

页数：4

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