BULK-BORONIZED LIMITER OPERATION IN THE WENDELSTEIN 7-AS STELLARATOR

被引：9

作者：

BRAKEL, R

BURHENN, R

BEHRISCH, R

GRIGULL, P

HACKER, H

HILDEBRANDT, D

HIROOKA, Y

HOFMANN, JV

MAHN, C

ROTH, J

SCHNEIDER, U

WELLER, A

机构：

[1] UNIV CALIF LOS ANGELES,INST PLASMA PHYS & FUS RES,LOS ANGELES,CA 90024

[2] UNIV STUTTGART,INST PLASMAFORSCH,W-7000 STUTTGART 80,GERMANY

来源：

JOURNAL OF NUCLEAR MATERIALS | 1992年 / 196卷

关键词：

D O I：

10.1016/S0022-3115(06)80073-5

中图分类号：

T [工业技术];

学科分类号：

08 ;

摘要：

Bulk-boronized graphite (20% boron) has been tested as a limiter material in the Wendelstein 7-AS stellarator. The recycling behaviour and the plasma impurities are compared for the new material and the formerly used TiC-coated graphite with stainless steel and boronized walls. After conditioning the recycling and the oxygen and carbon levels are comparable for both materials. No significant impact of sputter boronization from the limiters on the oxygen level was observed. A drastical reduction of oxygen by about a factor of 10 was obtained only after additional gas boronization. In this case Z(eff) is primarily determined by carbon and boron. For ECF standard discharges Z(eff) congruent-to 2 with P(rad) = 6% of the input power was found as compared to Z(eff) less-than-or-similar-to 3 and P(rad) = 10% before boronization and Z(eff) = 4, P(rad) = 20% with TiC-limiters.

引用

页码：431 / 435

页数：5

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