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Title: Design and 3D simulation of a two-cavity wide-gap relativistic klystron amplifier with high power injection

Abstract

By using an electromagnetic particle-in-cell (PIC) code, an S-band two-cavity wide-gap klystron amplifier (WKA) loaded with washers/rods structure is designed and investigated for high power injection application. Influences of the washers/rods structure on the high frequency characteristics and the basic operation of the amplifier are presented. Generally, the rod structure has great impacts on the space-charge potential depression and the resonant frequency of the cavities. Nevertheless, if only the resonant frequency is tuned to the desired operation frequency, effects of the rod size on the basic operation of the amplifier are expected to be very weak. The 3-dimension (3-D) PIC simulation results show an output power of 0.98 GW corresponding to an efficiency of 33% for the WKA, with a 594 keV, 5 kA electron beam guided by an external magnetic field of 1.5 Tesla. Moreover, if a conductive plane is placed near the output gap, such as the electron collector, the beam potential energy can be further released, and the RF power can be increased to about 1.07 GW with the conversion efficiency of about 36%.

Authors:
; ;  [1]
  1. College of Optoelectronic Science and Engineering, National University of Defense Technology, Changsha 410073 (China)
Publication Date:
OSTI Identifier:
22086068
Resource Type:
Journal Article
Journal Name:
Physics of Plasmas
Additional Journal Information:
Journal Volume: 19; Journal Issue: 8; Other Information: (c) 2012 American Institute of Physics; Country of input: International Atomic Energy Agency (IAEA); Journal ID: ISSN 1070-664X
Country of Publication:
United States
Language:
English
Subject:
46 INSTRUMENTATION RELATED TO NUCLEAR SCIENCE AND TECHNOLOGY; CAVITIES; COMPUTERIZED SIMULATION; EFFICIENCY; ELECTRON BEAMS; KEV RANGE; KLYSTRONS; MAGNETIC FIELDS; MICROWAVE AMPLIFIERS; POTENTIAL ENERGY; RELATIVISTIC RANGE; SPACE CHARGE; THREE-DIMENSIONAL CALCULATIONS

Citation Formats

Xianchen, Bai, Jianhua, Yang, and Jiande, Zhang. Design and 3D simulation of a two-cavity wide-gap relativistic klystron amplifier with high power injection. United States: N. p., 2012. Web. doi:10.1063/1.4742179.
Xianchen, Bai, Jianhua, Yang, & Jiande, Zhang. Design and 3D simulation of a two-cavity wide-gap relativistic klystron amplifier with high power injection. United States. doi:10.1063/1.4742179.
Xianchen, Bai, Jianhua, Yang, and Jiande, Zhang. Wed . "Design and 3D simulation of a two-cavity wide-gap relativistic klystron amplifier with high power injection". United States. doi:10.1063/1.4742179.
@article{osti_22086068,
title = {Design and 3D simulation of a two-cavity wide-gap relativistic klystron amplifier with high power injection},
author = {Xianchen, Bai and Jianhua, Yang and Jiande, Zhang},
abstractNote = {By using an electromagnetic particle-in-cell (PIC) code, an S-band two-cavity wide-gap klystron amplifier (WKA) loaded with washers/rods structure is designed and investigated for high power injection application. Influences of the washers/rods structure on the high frequency characteristics and the basic operation of the amplifier are presented. Generally, the rod structure has great impacts on the space-charge potential depression and the resonant frequency of the cavities. Nevertheless, if only the resonant frequency is tuned to the desired operation frequency, effects of the rod size on the basic operation of the amplifier are expected to be very weak. The 3-dimension (3-D) PIC simulation results show an output power of 0.98 GW corresponding to an efficiency of 33% for the WKA, with a 594 keV, 5 kA electron beam guided by an external magnetic field of 1.5 Tesla. Moreover, if a conductive plane is placed near the output gap, such as the electron collector, the beam potential energy can be further released, and the RF power can be increased to about 1.07 GW with the conversion efficiency of about 36%.},
doi = {10.1063/1.4742179},
journal = {Physics of Plasmas},
issn = {1070-664X},
number = 8,
volume = 19,
place = {United States},
year = {2012},
month = {8}
}