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Title: Frequency multiplying oscillator with an electron beam accelerated in a drift space

Abstract

In a uniform acceleration region, the behavior of a velocity-modulated electron beam has been analyzed using a particle-in-cell code. By making use of one of the accelerated harmonic components of the velocity-modulated electron beam, we demonstrate a frequency multiplying oscillator for a compact THz emitter, which employs multiple electron beams and a higher order mode resonator to modulate the electron beam without an additional driving source.

Authors:
; ; ;  [1];  [1];  [2]
  1. WCI Center for Quantum Beam-based Radiation Research, Korea Atomic Energy Research Institute, 1045 Deadeok, Yuseong, Daejeon 305-353 (Korea, Republic of)
  2. (Russian Federation)
Publication Date:
OSTI Identifier:
22089267
Resource Type:
Journal Article
Resource Relation:
Journal Name: Applied Physics Letters; Journal Volume: 101; Journal Issue: 1; Other Information: (c) 2012 American Institute of Physics; Country of input: International Atomic Energy Agency (IAEA)
Country of Publication:
United States
Language:
English
Subject:
46 INSTRUMENTATION RELATED TO NUCLEAR SCIENCE AND TECHNOLOGY; ACCELERATION; ELECTRON BEAMS; OSCILLATORS; RESONATORS; THZ RANGE

Citation Formats

Jang, Kyu-Ha, Lee, Kitae, Hee Park, Seong, Uk Jeong, Young, Miginsky, S., and Budker Institute of Nuclear Physics, SB RAS, Academician Lavrentyev St. 11, Novosibrisk. Frequency multiplying oscillator with an electron beam accelerated in a drift space. United States: N. p., 2012. Web. doi:10.1063/1.4733725.
Jang, Kyu-Ha, Lee, Kitae, Hee Park, Seong, Uk Jeong, Young, Miginsky, S., & Budker Institute of Nuclear Physics, SB RAS, Academician Lavrentyev St. 11, Novosibrisk. Frequency multiplying oscillator with an electron beam accelerated in a drift space. United States. doi:10.1063/1.4733725.
Jang, Kyu-Ha, Lee, Kitae, Hee Park, Seong, Uk Jeong, Young, Miginsky, S., and Budker Institute of Nuclear Physics, SB RAS, Academician Lavrentyev St. 11, Novosibrisk. 2012. "Frequency multiplying oscillator with an electron beam accelerated in a drift space". United States. doi:10.1063/1.4733725.
@article{osti_22089267,
title = {Frequency multiplying oscillator with an electron beam accelerated in a drift space},
author = {Jang, Kyu-Ha and Lee, Kitae and Hee Park, Seong and Uk Jeong, Young and Miginsky, S. and Budker Institute of Nuclear Physics, SB RAS, Academician Lavrentyev St. 11, Novosibrisk},
abstractNote = {In a uniform acceleration region, the behavior of a velocity-modulated electron beam has been analyzed using a particle-in-cell code. By making use of one of the accelerated harmonic components of the velocity-modulated electron beam, we demonstrate a frequency multiplying oscillator for a compact THz emitter, which employs multiple electron beams and a higher order mode resonator to modulate the electron beam without an additional driving source.},
doi = {10.1063/1.4733725},
journal = {Applied Physics Letters},
number = 1,
volume = 101,
place = {United States},
year = 2012,
month = 7
}
  • In the paper we theoretically investigate the mechanism by which the space of drift electrons is contracted in klystron-type bunchers which modulate the electron beam in ion accelerators, in particular to excite an rf field. The contraction of the drift length is effected through a decrease in the mean beam velocity in the field of an electrostatic lens or a metal tube and is based on the fact that the relative motion of velocity-modulated electrons are independent of the mean velocity of the electron beam in a weak modulation regime.
  • In this paper, the effects of electron beam parameters and velocity spread on the RF behavior of a metallic photonic band gap (PBG) cavity gyrotron operating at 35 GHz with TE{sub 041}–like mode have been theoretically demonstrated. PBG cavity is used here to achieve a single mode operation of the overmoded cavity. The nonlinear time-dependent multimode analysis has been used to observe the beam-wave interaction behavior of the PBG cavity gyrotron, and a commercially available PIC code “CST Particle Studio” has been reconfigured to obtain 3D simulation results in order to validate the analytical values. The output power for this typicalmore » PBG gyrotron has been obtained ∼108 kW with ∼15.5% efficiency in a well confined TE{sub 041}–like mode, while all other competing modes have significantly low values of power output. The output power and efficiency of a gyrotron depend highly on the electron beam parameters and velocity spread. The influence of several electron beam parameters, e.g., beam voltage, beam current, beam velocity pitch factor, and DC magnetic field, on the PBG gyrotron operations has been investigated. This study would be helpful in optimising the electron beam parameters and estimating accurate RF output power of the high frequency PBG cavity based gyrotron oscillators.« less
  • The influence of the magnitude and configuration of the magnetic field on the parameters of electron bunches formed in a multivelocity electron beam is analyzed. It is shown that the use of a cathode unshielded from the magnetic field and a nonuniform magnetic field increasing along the drift space enables the formation of compact electron bunches. The ratio between the current density in such bunches and the beam current density at the entrance to the drift space reaches 10{sup 6}, which results in a substantial broadening of the output microwave spectrum due to an increase in the amplitudes of themore » higher harmonics of the fundamental frequency.« less