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research-article

Sputtering of graphite by hydrogen isotopes in the fusion environment: a molecular dynamics simulation study

[+] Author and Article Information
Qiang Zhao

Beijing Key Laboratory of Passive Safety, Technology for Nuclear Energy, North China Electric Power University, Beijing 102206, China
qzhao@ncepu.edu.cn

Yang Li

Beijing Key Laboratory of Passive Safety, Technology for Nuclear Energy, North China Electric Power University, Beijing 102206, China
li_yang@ncepu.edu.cn

Zheng Zhang

Beijing Key Laboratory of Passive Safety, Technology for Nuclear Energy, North China Electric Power University, Beijing 102206, China
zzhang@ncepu.edu.cn

Xiaoping Ouyang

Beijing Key Laboratory of Passive Safety, Technology for Nuclear Energy, North China Electric Power University, Beijing 102206, China; Northwest Institute of Nuclear Technology, Xi'an, Shaanxi 710024, China
oyxp2003@aliyun.com

1Corresponding author.

ASME doi:10.1115/1.4040495 History: Received October 31, 2017; Revised May 25, 2018

Abstract

The sputtering of graphite due to the bombardment of hy- drogen isotopes is one of the critical issues in successfully using graphite in the fusion environment. In this work, we use molecular dynamics method to simulate the sputtering by using the LAMMPS. Calculation results show that the peak values of the sputtering yield are located between 25 eV to 50 eV. After the energy of 25 eV, the higher incident energy cause the lower carbon sputtering yield. The temperature which is most likely to sputter is about 800 K for hydrogen, deuterium and tritium. Before the 800 K, the sputtering rates increase when the temperature increase. After the 800 K, they decrease with the temperature increase. Under the same temperature and energy, the sputtering rate of tritium is big- ger than that of deuterium, the sputtering rate of deuterium is bigger than that of hydrogen. When the incident energy is 25 eV, the sputtering yield at 300 K increases before the incident angle at 30? and remains steady after that.

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