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Title: Cyclotron mode frequencies and resonant absorption in multi-species ion plasmas

Abstract

Cyclotron mode frequencies are studied on trapped rigid-rotor multi-species ion plasmas. Collective effects and radial electric fields shift the mode frequencies away from the “bare” cyclotron frequencies 2πF{sub c}{sup (s)}≡(q{sub s}B/M{sub s}c) for each species s. These frequency shifts are measured on the distinct cyclotron modes (m=0,1, and 2) with cos(mθ) azimuthal dependence. We find that for radially uniform plasmas the frequency shifts corroborate a simple theory expression, in which collective effects enter only through the E × B rotation frequency f{sub E} and the species fraction δ{sub s}. The m = 1 center-of-mass mode is in agreement with a simple “clump” model. Additionally, ultra-cold ion plasmas exhibit centrifugal separation by mass, and additional frequency shifts are observed, in agreement with a more general theory.

Authors:
; ; ;  [1]
  1. Department of Physics, University of California at San Diego, La Jolla, California 92093 (United States)
Publication Date:
OSTI Identifier:
22410370
Resource Type:
Journal Article
Journal Name:
Physics of Plasmas
Additional Journal Information:
Journal Volume: 22; Journal Issue: 5; Other Information: (c) 2015 AIP Publishing LLC; Country of input: International Atomic Energy Agency (IAEA); Journal ID: ISSN 1070-664X
Country of Publication:
United States
Language:
English
Subject:
70 PLASMA PHYSICS AND FUSION TECHNOLOGY; CENTER-OF-MASS SYSTEM; CYCLOTRON FREQUENCY; ELECTRIC FIELDS; MAGNETIC FIELDS; PLASMA; RESONANCE ABSORPTION; ROTATING PLASMA

Citation Formats

Affolter, M., Anderegg, F., Dubin, D. H. E., and Driscoll, C. F. Cyclotron mode frequencies and resonant absorption in multi-species ion plasmas. United States: N. p., 2015. Web. doi:10.1063/1.4917177.
Affolter, M., Anderegg, F., Dubin, D. H. E., & Driscoll, C. F. Cyclotron mode frequencies and resonant absorption in multi-species ion plasmas. United States. doi:10.1063/1.4917177.
Affolter, M., Anderegg, F., Dubin, D. H. E., and Driscoll, C. F. Fri . "Cyclotron mode frequencies and resonant absorption in multi-species ion plasmas". United States. doi:10.1063/1.4917177.
@article{osti_22410370,
title = {Cyclotron mode frequencies and resonant absorption in multi-species ion plasmas},
author = {Affolter, M. and Anderegg, F. and Dubin, D. H. E. and Driscoll, C. F.},
abstractNote = {Cyclotron mode frequencies are studied on trapped rigid-rotor multi-species ion plasmas. Collective effects and radial electric fields shift the mode frequencies away from the “bare” cyclotron frequencies 2πF{sub c}{sup (s)}≡(q{sub s}B/M{sub s}c) for each species s. These frequency shifts are measured on the distinct cyclotron modes (m=0,1, and 2) with cos(mθ) azimuthal dependence. We find that for radially uniform plasmas the frequency shifts corroborate a simple theory expression, in which collective effects enter only through the E × B rotation frequency f{sub E} and the species fraction δ{sub s}. The m = 1 center-of-mass mode is in agreement with a simple “clump” model. Additionally, ultra-cold ion plasmas exhibit centrifugal separation by mass, and additional frequency shifts are observed, in agreement with a more general theory.},
doi = {10.1063/1.4917177},
journal = {Physics of Plasmas},
issn = {1070-664X},
number = 5,
volume = 22,
place = {United States},
year = {2015},
month = {5}
}