Formation and mitigation of fiberform nanostructured tungsten by helium and sub-ms laser pulse irradiations

被引：2

作者：

Kajita, Shin ^{[1
]}

Sakaguchi, Wataru ^{[2
]}

Ohno, Noriyasu ^{[2
]}

机构：

[1] Nagoya Univ, EcoTopia Sci Inst, Nagoya, Aichi 4648603, Japan

[2] Nagoya Univ, Grad Sch Engn, Nagoya, Aichi 4648603, Japan

来源：

PLASMA DEVICES AND OPERATIONS | 2009年 / 17卷 / 02期

关键词：

helium irradiation; laser irradiation; in-vessel mirror material; optical reflectivity; tungsten; LOW-ENERGY; DIAGNOSTIC SYSTEMS; FUSION-REACTOR; 1ST MIRRORS; PLASMA IRRADIATION; SURFACE; OPERATION; TESTS; IONS; ITER;

D O I：

10.1080/10519990902884563

中图分类号：

TL [原子能技术]; O571 [原子核物理学];

学科分类号：

070305 [高分子化学与物理]; 080810 [电力电子与电能变换];

摘要：

Fiberform nanostructured tungsten is formed on tungsten surface by helium plasma irradiation under a specific condition. It is revealed that the optical reflectivity of tungsten is significantly decreased by the formation of the nanostructure. We present the experimentally obtained necessary condition to form the structure in the linear plasma device NAGDIS-II. We investigate the effects of laser irradiation to the helium-irradiated surface on the optical reflectivity. It is revealed that the sub-ms laser pulse irradiation alleviates the surface roughness and recovers the optical reflectivity. However, when the structure is finer, the recovery rate becomes low, typically less than half; moreover, it decreases with the number of pulses.

引用

页码：165 / 173

页数：9

共 19 条

[1]

Irradiation effects of low energy helium ions on optical reflectivity of metallic mirror [J].