Quantitatively measuring the influence of helium in plasma-exposed tungsten

被引：26

作者：

Doerner, R. P. ^{[1
]}

Baldwin, M. J. ^{[1
]}

Simmonds, M. ^{[1
]}

Yu, J. H. ^{[1
]}

Buzi, L. ^{[2
,4
]}

Schwarz-Selinger, T. ^{[3
]}

机构：

[1] UCSD, Energy Res Ctr, La Jolla, CA 92093 USA

[2] Univ Ghent, Dept Appl Phys, Sint Pietersnieuwstr 41, B-90 Ghent, Belgium

[3] Max Planck Inst Plasma Phys, Boltzmannstr 2, D-85748 Garching, Germany

[4] Princeton Plasma Phys Lab, Princeton, NJ 08540 USA

来源：

NUCLEAR MATERIALS AND ENERGY | 2017年 / 12卷

关键词：

Plasma-material interactions; Helium; Tungsten; Retention; BUBBLES;

D O I：

10.1016/j.nme.2016.09.002

中图分类号：

TL [原子能技术]; O571 [原子核物理学];

学科分类号：

0827 ; 082701 ;

摘要：

Tungsten samples are exposed to 3 He plasma to quantify their helium retention behavior. The retention saturates quickly with helium fluence and increases only slightly from 4.3 x 10(19) He/m(2) at 773 K, to 7.5 x 10(19) He/m(2) at 973 K. The helium content increases dramatically to 6.8 x 10(20) He/m(2) when fuzz is formed on the surface of a sample exposed at 1173 K, but the majority of the retained helium (5.1 x 10(20) He/m(2)) is found to reside below the layer of fuzz tendrils. Additional tungsten samples were exposed to either simultaneous, or sequential, D/He plasma, followed by TDS. Measurements show the majority of the D retained during simultaneous exposures is located in the near surface region of helium nano-bubbles. No deuterium was detected in any of the samples after the heating to 1273 K, but 67% of the helium was released from simultaneously exposed samples, and only 23% of the helium was released from the sequentially exposed samples. (C) 2016 The Authors. Published by Elsevier Ltd. This is an open access article under the CC BY-NC-ND license.

引用

页码：372 / 378

页数：7

共 27 条

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