Effects of some parameters on the divertor plasma sheath characteristics and fuel retention in castellated tungsten tile gaps

doi:10.1088/1674-1056/23/11/115201

Abstract

Castellation of plasma facing components is foreseen as the best solution for ensuring the lifetime of future fusion devices. However, the gaps between the resulting surface elements can increase fuel retention and complicate fuel removal issues. To know how the fuel is retained inside the gaps, the plasma sheath around the gaps needs to be understood first. In this work, a kinetic model is used to study plasma characteristics around the divertor gaps with the focus on the H⁺ penetration depth inside the poloidal gaps, and a rate-theory model is coupled to simulate the hydrogen retention inside the tungsten gaps. By varying the magnetic field strength and plasma temperature, we find that the H⁺ cyclotron radius has a significant effect on the penetration depth. Besides, the increase of magnetic field inclination angle can also increase the penetration depth. It is found in this work that parameters as well as the penetration depth strongly affect fuel retention in tungsten gaps.

Keywords: divertor gaps penetration depth plasma sheath fuel retention

Received: 01 March 2014
Revised: 01 April 2013
Accepted manuscript online:

PACS:	52.40.Kh	(Plasma sheaths)
	52.55.Rk	(Power exhaust; divertors)
	52.65.Rr	(Particle-in-cell method)
	52.65.-y	(Plasma simulation)

Fund:

Project supported by the National Magnetic Confinement Fusion Science Program, China (Grant No. 2013GB109001), the National Natural Science Foundation of China (Grant Nos. 11275042 and 11305026), and the Fundamental Research Funds for the Central Universities of Ministry of Education of China (Grant No. DUT14RC(3)039).

Corresponding Authors: Sang Chao-Feng, Wang De-Zhen
E-mail: sang@dlut.edu.cn;wangdez@dlut.edu.cn

Cite this article:

Sang Chao-Feng (桑超峰), Dai Shu-Yu (戴舒宇), Sun Ji-Zhong (孙继忠), Bonnin Xavier, Xu Qian (徐倩), Ding Fang (丁芳), Wang De-Zhen (王德真) Effects of some parameters on the divertor plasma sheath characteristics and fuel retention in castellated tungsten tile gaps 2014 Chin. Phys. B 23 115201

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Effects of some parameters on the divertor plasma sheath characteristics and fuel retention in castellated tungsten tile gaps

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