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Title: Magnetized Plasma-filled Waveguide: A New High-Gradient Accelerating Structure

Abstract

Electromagnetic waves confined between the metal plates of a plasma-filled waveguide are investigated. It is demonstrated that when the plasma is magnetized along the metallic plates, there exists a luminous accelerating wave propagating with a very slow group velocity. It is shown that the magnetized plasma 'isolates' the metal wall from the transverse electric field, thereby reducing potential breakdown problems. Applications of the metallic plasma-filled waveguide to particle accelerations and microwave pulse manipulation are described.

Authors:
;  [1]
  1. Department of Physics and Institute for Fusion Studies, University of Texas at Austin, One University Station C1500, Austin, Texas 78712 (United States)
Publication Date:
OSTI Identifier:
21255271
Resource Type:
Journal Article
Resource Relation:
Journal Name: AIP Conference Proceedings; Journal Volume: 1086; Journal Issue: 1; Conference: 13. advanced accelerator concepts workshop, Santa Cruz, CA (United States), 27 Jul - 2 Aug 2008; Other Information: DOI: 10.1063/1.3080959; (c) 2009 American Institute of Physics; Country of input: International Atomic Energy Agency (IAEA)
Country of Publication:
United States
Language:
English
Subject:
71 CLASSICAL AND QUANTUM MECHANICS, GENERAL PHYSICS; 46 INSTRUMENTATION RELATED TO NUCLEAR SCIENCE AND TECHNOLOGY; ACCELERATION; ELECTRIC FIELDS; LINEAR ACCELERATORS; METALS; MICROWAVE RADIATION; PLASMA; PLATES; PULSES; WAVEGUIDES

Citation Formats

Avitzour, Yoav, and Shvets, Gennady. Magnetized Plasma-filled Waveguide: A New High-Gradient Accelerating Structure. United States: N. p., 2009. Web. doi:10.1063/1.3080959.
Avitzour, Yoav, & Shvets, Gennady. Magnetized Plasma-filled Waveguide: A New High-Gradient Accelerating Structure. United States. doi:10.1063/1.3080959.
Avitzour, Yoav, and Shvets, Gennady. Thu . "Magnetized Plasma-filled Waveguide: A New High-Gradient Accelerating Structure". United States. doi:10.1063/1.3080959.
@article{osti_21255271,
title = {Magnetized Plasma-filled Waveguide: A New High-Gradient Accelerating Structure},
author = {Avitzour, Yoav and Shvets, Gennady},
abstractNote = {Electromagnetic waves confined between the metal plates of a plasma-filled waveguide are investigated. It is demonstrated that when the plasma is magnetized along the metallic plates, there exists a luminous accelerating wave propagating with a very slow group velocity. It is shown that the magnetized plasma 'isolates' the metal wall from the transverse electric field, thereby reducing potential breakdown problems. Applications of the metallic plasma-filled waveguide to particle accelerations and microwave pulse manipulation are described.},
doi = {10.1063/1.3080959},
journal = {AIP Conference Proceedings},
number = 1,
volume = 1086,
place = {United States},
year = {Thu Jan 22 00:00:00 EST 2009},
month = {Thu Jan 22 00:00:00 EST 2009}
}
  • The characteristics of TE modes in a transversely magnetized plane-parallel waveguide containing a relativistically moving warm plasma have been studied. The effects of the finite electron temperature of the plasma have been incorporated in terms of an anisotropic pressure. Using the first three moment equations in conjunction with Maxwell-Minkowski equations, we have derived the dispersion relation and the cutoff frequencies for the TE mode. It is found that the TE mode is modified due to the thermal motion of electrons to depend upon the velocity of the moving medium and the applied magnetic field. Numerical results for the cutoff frequenciesmore » are presented for several values of the parameters characterizing the electron-plasma temperature, the velocity of the moving medium, and the strength of the applied magnetic field.« less
  • In this article, EH{sub 01} field components are evaluated in a cylindrical waveguide filled with plasma in the presence of external static magnetic field applied along the direction of the mode propagation. The electron acceleration inside the plasma-filled cylindrical waveguide is investigated numerically for a single-electron model. It is found that the electron acceleration is very sensitive to the initial phase of mode-field components, external static magnetic field, plasma density, point of injection of the electron, and microwave power density. The maximum amplitude of the EH{sub 01} mode's field components is approximately 100 times greater than the vacuum-waveguide case formore » operating microwave frequency f=7.64 GHz, plasma density n{sub 0}=1.08x10{sup 17} m{sup -3}, initial phase angle {phi}{sub 0}=60 deg., and microwave power {approx}14 MW in a cylindrical waveguide with a radius of 2.1 cm. An electron with 100 keV gets 27 MeV energy gain in 2.5 cm along the waveguide length in the presence of external power {approx}14 MW with a microwave frequency of 7.64 GHz. The electron trajectory is also analyzed under the effects of magnetic field when the electron is injected in the waveguide at r=R/2.« less
  • The effect of plasma-electron collision and their thermal motion is investigated on the externally injected electron in a warm magnetized plasma-filled cylindrical waveguide of cross section of 13.68 cm{sup 2}. The numerical results are presented for the external electron-energy gain and its trajectory in a nonrelativistic {gamma}{sub e}=1 and stationary v{sub 0}=0 warm magnetized plasma-filled waveguide. Results shows that for an electron-cyclotron frequency {omega}{sub c} greater than the electron-plasma frequency {omega}{sub p}, a 100 keV electron acquires a 1.74 MeV energy in a 2.5 cm distance for plasma density n{sub 0}=1.08x10{sup 17}/m{sup 3}, magnetic field B{sub 0}=0.193 T, microwave frequencymore » f=7.64 GHz, plasma-electron thermal velocity v{sub th}=0.2c, and plasma-electron collision frequency {nu}=4 GHz, which is lower than the 7 MeV electron energy in a cold magnetized plasma-waveguide case. Space-charge effects and other nonlinear effects are assumed to be negligible in this model.« less