Estimation of the lifetime of small helium bubbles near tungsten surfaces - A methodological study

被引：20

作者：

Cui, Jiechao ^{[1
]}

Wu, Zhangwen ^{[1
]}

Hou, Qing ^{[1
]}

机构：

[1] Sichuan Univ, Inst Nucl Sci & Technol, Key Lab Radiat Phys & Technol, Chengdu 610064, Peoples R China

来源：

NUCLEAR INSTRUMENTS & METHODS IN PHYSICS RESEARCH SECTION B-BEAM INTERACTIONS WITH MATERIALS AND ATOMS | 2016年 / 383卷

关键词：

Molecular dynamics; Helium bubble; Lifetime; Plasma material interaction; Multiscale simulations; MOLECULAR-DYNAMICS SIMULATIONS; LOW-ENERGY HELIUM; FUZZ FORMATION; CLUSTERS; BOMBARDMENTS; TEMPERATURE; IRRADIATION; DIFFUSION; BEHAVIOR; MODEL;

D O I：

10.1016/j.nimb.2016.07.001

中图分类号：

TH7 [仪器、仪表];

学科分类号：

0804 ; 080401 ; 081102 ;

摘要：

Under low energy and high flux/fluence irradiation of helium (He) atoms, the formation and bursting of He bubbles on tungsten (W) surfaces play important roles in the morphological evolution of component surfaces in fusion reactors. Microscopically, the bursting of He bubbles is a stochastic process, and He bubbles have statistically average lifetimes. In the present paper, a molecular dynamics-based method was developed to extract, for the first time, the lifetime of He bubbles near tungsten surfaces. It was found that He bubble bursting can be treated as an activated event. Its frequency or, equivalently, the average lifetime of bubbles follows the Arrhenius equation. For a given bubble size, the activation energy exhibits a good linear dependence with the depth, and the pre-exponential factor obeys the Meyer Neldle rule. These results are useful for establishing a model in multi-scale simulations of the morphological evolution of component surfaces in fusion reactors. (C) 2016 Elsevier B.V. All rights reserved.

引用

页码：136 / 142

页数：7

共 46 条

[1] AN IMPROVED N-BODY SEMIEMPIRICAL MODEL FOR BODY-CENTERED CUBIC TRANSITION-METALS [J].

ACKLAND, GJ ;

THETFORD, R .

PHILOSOPHICAL MAGAZINE A-PHYSICS OF CONDENSED MATTER STRUCTURE DEFECTS AND MECHANICAL PROPERTIES, 1987, 56 (01) :15-30

[2] Helium induced nanoscopic morphology on tungsten under fusion relevant plasma conditions [J].

Baldwin, M. J. ;

Doerner, R. P. .

NUCLEAR FUSION, 2008, 48 (03)

[3] The behavior of small helium clusters near free surfaces in tungsten [J].

Barashev, A. V. ;

Xu, H. ;

Stoller, R. E. .

JOURNAL OF NUCLEAR MATERIALS, 2014, 454 (1-3) :421-426

[4] MANY-BODY NATURE OF THE MEYER-NELDEL COMPENSATION LAW FOR DIFFUSION [J].

BOISVERT, G ;

LEWIS, LJ ;

YELON, A .

PHYSICAL REVIEW LETTERS, 1995, 75 (03) :469-472

[5] Reflection and implantation of low energy helium with tungsten surfaces [J].

Borovikov, Valery ;

Voter, Arthur F. ;

Tang, Xian-Zhu .

JOURNAL OF NUCLEAR MATERIALS, 2014, 447 (1-3) :254-270

[6] Plasma-surface interaction issues of an all-metal ITER [J].

Brooks, J. N. ;

Allain, P. ;

Doerner, R. P. ;

Hassanein, A. ;

Nygren, R. ;

Rognlien, T. D. ;

Whyte, D. G. .

NUCLEAR FUSION, 2009, 49 (03)

[7] Molecular dynamics study of helium bubble pressure in tungsten [J].

Cui, Jiechao ;

Li, Min ;

Wang, Jun ;

Hou, Qing .

NUCLEAR INSTRUMENTS & METHODS IN PHYSICS RESEARCH SECTION B-BEAM INTERACTIONS WITH MATERIALS AND ATOMS, 2015, 352 :104-106

[8] Molecular dynamics study on the interactions between helium projectiles and helium bubbles pre-existing in tungsten surfaces [J].

Ding, Yuan ;

Ma, Chaoqiong ;

Li, Min ;

Hou, Qing .

NUCLEAR INSTRUMENTS & METHODS IN PHYSICS RESEARCH SECTION B-BEAM INTERACTIONS WITH MATERIALS AND ATOMS, 2016, 368 :50-59

[9] Crystal orientation effects on helium ion depth distributions and adatom formation processes in plasma-facing tungsten [J].

Hammond, Karl D. ;

Wirth, Brian D. .

JOURNAL OF APPLIED PHYSICS, 2014, 116 (14)

[10] Molecular dynamics simulations of helium cluster formation in tungsten [J].

Henriksson, KOE ;

Nordlund, K ;

Keinonen, J .

NUCLEAR INSTRUMENTS & METHODS IN PHYSICS RESEARCH SECTION B-BEAM INTERACTIONS WITH MATERIALS AND ATOMS, 2006, 244 (02) :377-391

← 1 2 3 4 5 →