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Study on strip spiral Blumlein line for the pulsed forming line of intense electron-beam accelerators

Published online by Cambridge University Press:  15 January 2009

J.L. Liu ,
X.B. Cheng ,
B.L. Qian ,
B. Ge ,
J.D. Zhang  and
X.X. Wang
J.L. Liu*
Affiliation:
College of Photoelectical Engineering and Science, National University of Defense Technology, Changsha, China Department of Electrical Engineering, Tsinghua University, Beijing, China
X.B. Cheng
Affiliation:
College of Photoelectical Engineering and Science, National University of Defense Technology, Changsha, China
B.L. Qian
Affiliation:
College of Photoelectical Engineering and Science, National University of Defense Technology, Changsha, China
B. Ge
Affiliation:
College of Photoelectical Engineering and Science, National University of Defense Technology, Changsha, China
J.D. Zhang
Affiliation:
College of Photoelectical Engineering and Science, National University of Defense Technology, Changsha, China
X.X. Wang
Affiliation:
Department of Electrical Engineering, Tsinghua University, Beijing, China
*
Address correspondence and reprint requests to: Jinliang Liu, College of Photoelectical Engineering and Science, National University of Defense Technology, Changsha, 410073, China. E-mail: ljle333@yahoo.com
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Abstract

The pulse forming line (PFL) is the key part of the intense electron-beam accelerators (IEBA), which determines the quality and characteristic of the output beam current of the IEBA. Compared with the accelerator with traditional Blumlein line, an IEBA based on strip spiral Blumlein line (SSBL) can increase the duration of the output pulse in the same geometrical dimension. But the disadvantage of the SSBL is that the output voltage waveform at the matched load may be distorted, which influences the electron beam quality. In this paper, according to the electromagnetic theory, formulas for calculating the main electric parameters of SSBL (inductance, capacitance, transmission time, and characteristic impedance) are deduced. The effect of the geometric parameters of SSBL on the slowing coefficient is analyzed. The designed condition of SSBL for the output ideal voltage pulse in the matched load is obtained by theoretical analysis. Furthermore, the Karat code is used to simulate the output voltage waveform of SSBL on the matched load for different spiral angels. At last, a couple of contrastive experiments are performed on an electron-beam accelerator based on the SSBL with water dielectric. The experimental results agree with the theoretical and simulated results.

Keywords

Intense electron-beam acceleratorStrip spiral Blumlein lineVoltage waveform
Type
Research Article
Information
Laser and Particle Beams , Volume 27 , Issue 1 , March 2009 , pp. 95 - 102
Copyright
Copyright © Cambridge University Press 2009

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