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Operating characteristics of intense electron beam accelerator at different load conditions

Published online by Cambridge University Press:  01 August 2012

Xin-Bing Cheng ,
Jin-Liang Liu ,
Zhi-Qiang Hong  and
Bao-Liang Qian
Xin-Bing Cheng
Affiliation:
College of Opto-electronic Science and Engineering, National University of Defense Technology, Changsha, Hunan, Peoples Republic of China
Jin-Liang Liu*
Affiliation:
College of Opto-electronic Science and Engineering, National University of Defense Technology, Changsha, Hunan, Peoples Republic of China
Zhi-Qiang Hong
Affiliation:
College of Opto-electronic Science and Engineering, National University of Defense Technology, Changsha, Hunan, Peoples Republic of China
Bao-Liang Qian
Affiliation:
College of Opto-electronic Science and Engineering, National University of Defense Technology, Changsha, Hunan, Peoples Republic of China
*
Address correspondence and reprint requests to: Jin-Liang Liu, College of Opto-electronic Science and Engineering, National University of Defense Technology, Changsha, Hunan, 410073Peoples Republic of China. E-mail: ljle333@yahoo.com
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Abstract

As the development of the pulsed power technology, high voltage pulse transformer (HVPT) is usually used instead of Marx generator as a charging device for the pulse forming line (PFL) of intense electron-beam accelerator (IEBA), and which make the IEBA compact. However, during the operation of the IEBA, the HVPT may be destroyed for the failure of electrical insulation and the over-voltage. So in this paper, the output voltage characteristics of IEBA, characteristics of the voltage at the output terminal of HVPT at four kinds of load conditions are analyzed, including load matching, load short, load open, and surface flashover in the vacuum chamber. It is found that load short, load open, and surface flashover in vacuum chamber will affect the voltage at the output terminal of HVPT, and an oscillation wave could be formed, which affect the electrical insulation of HVPT and decrease the lifetime of HVPT. Meanwhile, the waveform of the load voltage is also modified, especially at the conditions of load open and surface flashover in vacuum chamber. When the load is open, the amplitude of the output main pulse of IEBA is twice the charging voltage of BPFL. However, the amplitude of the output pulse of IEBA is modified by the voltage at the output terminal of HVPT, and the resistance of main switch channel has a great effect on the amplitude of the load voltage. When surface flashover occurs in the vacuum chamber, the pulse duration of the output voltage will be decreased. So, during the operation of IEBA, load short, load open and surface flashover in vacuum chamber should be avoided.

Keywords

Blumlein pulse forming lineHigh voltage pulse transformerIntense electron-beam acceleratorLoadVoltage waveform
Type
Research Article
Information
Laser and Particle Beams , Volume 30 , Issue 4 , December 2012 , pp. 531 - 539
Copyright
Copyright © Cambridge University Press 2012

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