A study of tungsten migration in the Alcator C-Mod divertor

被引：15

作者：

Barnard, H. S. ^{[1
]}

Lipschultz, B. ^{[1
]}

Whyte, D. G. ^{[1
]}

机构：

[1] MIT, Plasma Sci & Fus Ctr, Cambridge, MA 02139 USA

来源：

JOURNAL OF NUCLEAR MATERIALS | 2011年 / 415卷 / 01期

关键词：

PLASMA; EROSION;

D O I：

10.1016/j.jnucmat.2010.12.317

中图分类号：

T [工业技术];

学科分类号：

08 ;

摘要：

A toroidally-continuous row of bulk tungsten (W) tiles was installed near the typical location of the outer strike-point in the Alcator C-Mod divertor and was removed for analysis after two campaigns (3151 plasma discharges). External beam (in-air) particle induced X-ray emission (PIXE) analysis has been used to observe campaign-integrated W migration patterns in the otherwise Mo divertor using the Was a tracer for divertor erosion and transport. With a set of high spatial resolution PIXE measurements (similar to 3 mm resolution), poloidal profiles of W migration have been constructed. Redeposition of up to 1.5 x 10(21) atoms/m(2) (similar to 20 nm equivalent thickness) is observed on the outer and inner divertor, and in the private-flux region. The campaign-integrated deposition on the analyzed tiles corresponds to net W erosion of similar to 60 nm (>0.014 nm/s). The migration profiles indicate sputtering and prompt redeposition in the outer divertor, neutral and ion transport through the private-flux region, and transport in the scrape off layer. (C) 2011 Elsevier B.V. All rights reserved.

引用

页码：S301 / S304

页数：4

共 7 条

[1] Observations of cold, high density plasma in the private flux region of the Alcator C-Mod divertor [J].