A SPUTTERING REDEPOSITION ANALYSIS OF ALKALI-BASED TUNGSTEN COMPOSITES FOR LIMITER DIVERTOR APPLICATIONS

被引：4

作者：

DEWALD, AB

BROOKS, JN

KRAUSS, AR

GRUEN, DM

VALENTINE, MG

机构：

[1] ARGONNE NATL LAB, ARGONNE, IL 60439 USA

[2] GEORGIA INST TECHNOL, ATLANTA, GA 30332 USA

来源：

JOURNAL OF NUCLEAR MATERIALS | 1987年 / 145卷

关键词：

EROSION - PLASMAS - Impurities - TUNGSTEN AND ALLOYS - Sputtering;

D O I：

10.1016/0022-3115(87)90363-1

中图分类号：

T [工业技术];

学科分类号：

08 ;

摘要：

Composites of porous tungsten infiltrated with alkali metal-bearing alloys have been projected as a means of reducing plasma impurities and sputter erosion in magnetic fusion devices. Self-sustaining alkali metal overlayers have been observed to inhibit erosion of the underlying structural substrate by 2 multiplied by to 10 multiplied by . The alkali metal itself, insofar as it sputters as a secondary ion, is trapped at the surface by sheath potential and tangential magnetic fields. Self-regeneration of the alkali metal coating is obtained by thermal and radiation-induced segregation from the bulk. The sputtering and redeposition properties of several tungsten-based composites are analyzed for limiter and divertor plasma regimes in comparison to pure tungsten.

引用

页码：373 / 378

页数：6

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