In situ study of short-term retention of deuterium in tungsten during and after plasma exposure in PSI-2

被引：5
|
作者：
Jiang, X. [1 ]
Sergienko, G. [1 ]
Kreter, A. [1 ]
Brezinsek, S. [1 ]
Linsmeier, Ch [1 ]
机构：
[1] Forschungszentrum Julich, Inst Energie & Klimaforsch Plasmaphys, D-52425 Julich, Germany
来源：
NUCLEAR FUSION | 2021年 / 61卷 / 09期
关键词：
laser induced breakdown spectroscopy; short-term fuel retention; in situ in vacuo fuel monitoring; deuterium in tungsten; outgassing process; plasma-wall interaction; fusion material diagnostic; HYDROGEN ISOTOPE-EXCHANGE; SINGLE-CRYSTAL; DEVICE PSI-2;
D O I：
10.1088/1741-4326/ac112e
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：
In situ monitoring of the hydrogenic fuel inventory in plasma-facing materials (PFMs) is a key issue for the sustainable and safe operation of a magnetically confined fusion device. A laser induced breakdown spectroscopy system has been applied on the linear plasma device PSI-2 to determine the short-term retention of deuterium (D) in the most promising PFM-tungsten (W). Measurements of the fuel content were performed (a) during plasma exposure, providing the dynamic D content in W and (b) after plasma exposure, determining the outgassing of D from W in vacuum. The in situ measurement of D content in W is in the time range of about 100 minutes before plasma termination (during plasma exposure) to 240 minutes after plasma termination (after plasma exposure). The measured surface D content in W drops to 17%-37% of the initial amount (measured before the plasma is switched off), showing a reduction factor of ca. 3-6 within the first 240 minutes.
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页数：9
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