Nuclear Science and Techniques

《核技术》(英文版) ISSN 1001-8042 CN 31-1559/TL     2019 Impact factor 1.556

Nuclear Science and Techniques ›› 1994, Vol. 5 ›› Issue (3): 174

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IMPROVEMENT ON PROPERTY AND WORKING LIFE OF FREEMAN SOURCE

Zheng Sixiao(郑思孝), Sun Guanqing(孙官清), Wang Peilu(王培禄), Liu Zhongyang(刘仲阳), Jiang Jingyun(姜景云) and Liao Xiaodong(廖小东)   

  1. Institute of Nuclear Science and Technology, Sichuan University, Chengdu 610064, China
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Zheng Sixiao(郑思孝), Sun Guanqing(孙官清), Wang Peilu(王培禄), Liu Zhongyang(刘仲阳), Jiang Jingyun(姜景云) and Liao Xiaodong(廖小东). IMPROVEMENT ON PROPERTY AND WORKING LIFE OF FREEMAN SOURCE.Nuclear Science and Techniques, 1994, 5(3): 174

Abstract: The magnetic mirror field caused by a pair of mild steel circular in 15mm diameter, 2 mm thickness placed outside the discharge chamber can increase the atom ion ratio of nitrogen from 66% to 81%, and the heating filament current can be decreased from 130 A down to 100A for a new filament of 2mm in diameter. The Mo shield cylinders in 14mm diameter put behind the reflect cathode surrounding the BN insulator prevent the metallization of BN insulators, and result in increasing the stability of arc discharge till to the end of filament working life. Because it restricts the deposition of the sputtered W and Mo atoms on the BN insulator, and maintains a high resistance of 70 MΩ between the anode and cathode. The combination of cathode shield cylinder and forming magnetic mirror field improves the running property, life of the Freeman source being about 40h.

Key words: Freeman source, Nitrogen spectrum, Cathode shield and magnetic mirror field