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Chin. Phys. B, 2018, Vol. 27(2): 028401    DOI: 10.1088/1674-1056/27/2/028401

A low-outgassing-rate carbon fiber array cathode

An-Kun Li(李安昆), Yu-Wei Fan(樊玉伟), Bao-Liang Qian(钱宝良), Zi-Cheng Zhang(张自成), Tao Xun(荀涛)
College of Optoelectric Science and Engineering, National University of Defense Technology, Changsha 410073, China
Abstract  In this paper, a new carbon fiber based cathode-a low-outgassing-rate carbon fiber array cathode-is investigated experimentally, and the experimental results are compared with those of a polymer velvet cathode. The carbon fiber array cathode is constructed by inserting bunches of carbon fibers into the cylindrical surface of the cathode. In experiment, the diode base pressure is maintained at 1×10-2 Pa-2×10-2 Pa, and the diode is driven by a compact pulsed power system which can provide a diode voltage of about 100 kV and pulse duration of about 30 ns at a repetition rate of tens of Hz. Real-time pressure data are measured by a magnetron gauge. Under the similar conditions, the experimental results show that the outgassing rate of the carbon fiber array cathode is an order smaller than that of the velvet cathode and that this carbon fiber array cathode has better shot-to-shot stability than the velvet cathode. Hence, this carbon fiber array cathode is demonstrated to be a promising cathode for the radial diode, which can be used in magnetically insulated transmission line oscillator (MILO) and relativistic magnetron (RM).
Keywords:  high power microwave      magnetically insulated transmission line oscillator      carbon fiber array cathode      low outgassing rate  
Received:  04 August 2017      Revised:  09 November 2017      Published:  05 February 2018
PACS:  84.90.+a (Other topics in electronics, radiowave and microwave technology, and direct energy conversion and storage)  
  84.40.Fe (Microwave tubes (e.g., klystrons, magnetrons, traveling-wave, backward-wave tubes, etc.))  
Fund: Project supported by the National Natural Science Foundation of China (Grant No. 61671457).
Corresponding Authors:  Yu-Wei Fan     E-mail:
About author:  84.90.+a; 84.40.Fe

Cite this article: 

An-Kun Li(李安昆), Yu-Wei Fan(樊玉伟), Bao-Liang Qian(钱宝良), Zi-Cheng Zhang(张自成), Tao Xun(荀涛) A low-outgassing-rate carbon fiber array cathode 2018 Chin. Phys. B 27 028401

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