Characterization of high flux magnetized helium plasma in SCU-PSI linear device

• Published in: Plasma science & technology Vol. 20; no. 2; pp. 104 - 109
• Main Author: 马小春;曹小岗;韩磊;张志艳;韦建军;芶富均
• Format: Journal Article
• Language: English
• Published: IOP Publishing 01.02.2018
• Subjects: beam diameter; electron density; helium plasma; ion flux; nanostructure fuzz; 高流动;血浆;设备;线性;字母;希腊;表面相互作用;氦
• ISSN: 1009-0630; 1009-0630
• DOI: 10.1088/2058-6272/aa936e

A high-flux linear plasma device in Sichuan University plasma-surface interaction（SCU-PSI）based on a cascaded arc source has been established to simulate the interactions between helium and hydrogen plasma with the plasma-facing components in fusion reactors.In this paper,the helium plasma has been characterized by a double-pin Langmuir probe.The results show that the stable helium plasma beam with a diameter of 26 mm was constrained very well at a magnetic field strength of 0.3 T.The core density and ion flux of helium plasma have a strong dependence on the applied current,magnetic field strength and gas flow rate.It could reach an electron density of1.2×10^19m^-3and helium ion flux of 3.2×10^22m^-2s^-1,with a gas flow rate of 4 standard liter per minute,magnetic field strength of 0.2 T and input power of 11 k W.With the addition of-80 Vapplied to the target to increase the helium ion energy and the exposure time of 2 h,the flat top temperature reached about 530°C.The different sizes of nanostructured fuzz on irradiated tungsten and molybdenum samples surfaces under the bombardment of helium ions were observed by scanning electron microscopy.These results measured in the SCU-PSI linear device provide a reference for International Thermonuclear Experimental Reactor related PSI research.