Deposition and erosion in local shadow regions of TEXTOR-94

被引：10
|
作者：
Wienhold, P
Rubel, M
Mayer, M
Hildebrandt, D
Schneider, W
Kirschner, A
机构：
[1] EURATOM, Forschungszentrum Julich GmbH, Inst Plasma Phys, D-52425 Julich, Germany
[2] Royal Inst Technol, EURATOM Assoc, Alfven Lab, S-10044 Stockholm, Sweden
[3] EURATOM, Max Planck Inst Plasmaphys, D-10117 Berlin, Germany
来源：
PHYSICA SCRIPTA | 2001年 / T94卷
关键词：
D O I：
10.1238/Physica.Topical.094a00141
中图分类号：
O4 [物理学];
学科分类号：
0702 ;
摘要：
Carbon erosion and deposition were investigated on the surface of a flat target covered with an a-C:H film and exposed for 197 s in the SOL of TEXTOR-94. The target was declined by 20 degrees with respect to the toroidal direction and partly protected by an aluminum (3 mm) plate which created an 8 mm wide local shadow. Thickness changes were measured by colorimetry after each plasma discharge. Carbon is eroded from surface areas near the plasma edge (LCFS +1 cm) and transported into the local shadow regions. Accumulation rates up to approximate to 7nm/s were found. The erosion in the local shadow regions (about - 0.1 nm/s) is due to charge exchange neutrals. The observations are confirmed by ion beam analyses and by preliminary calculations with the B2-EIRENE and ERO-TEXTOR code.
引用
收藏
页码：141 / 145
页数：5
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