Isolated nano-tendril bundles on tungsten surfaces exposed to radiofrequency helium plasma

被引：18
作者：
Woller, Kevin B. [1 ]
Whyte, Dennis G. [1 ]
Wright, Graham M. [1 ]
机构：
[1] MIT, Plasma Sci & Fus Ctr, 175 Albany St, Cambridge, MA 02139 USA
来源：
NUCLEAR MATERIALS AND ENERGY | 2017年 / 12卷
基金：
美国国家科学基金会;
关键词：
Tungsten fuzz; Helium; Nano-tendril; RF sheath; ION ENERGY-DISTRIBUTION; MOLECULAR-DYNAMICS; IRRADIATION; DIFFUSION; FIELD; POTENTIALS; GROWTH; SIMULATION; MECHANISM; ANALYZER;
D O I：
10.1016/j.nme.2017.04.016
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：
The DIONISOS experiment is used to study the impact of RF helium (He) plasma on the surface morphology of tungsten (W) at a frequency of 13.56 MHz. Helium ion energy distributions with a span of 7075 eV, while still below the sputtering threshold result in nano-tendril bundles (NTBs) and free-standing W whiskers on surfaces at 1020 K. The NTBs are distributed intragranularly with coverage of less than 10% while reaching up to 30 mu m normal to the surface for He ion fluence of 7.6 x 10(25) m(-2) and flux density of 10(22) m(-2) s(-1). Analysis of the NTB interior and sub-surface structure is provided through focused ion beam cross section. (C) 2017 The Authors. Published by Elsevier Ltd.
引用
收藏
页码：1282 / 1287
页数：6
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