Cyclotron mode frequency shifts in multi-species ion plasmas

In trapped plasmas, electric fields and collective effects shift the cyclotron mode frequencies away from the “bare” cyclotron frequency for each species s. Here, these shifts are measured on a set of cyclotron modes (m=0,1, and 2) with cos(mθ) azimuthal dependence in near rigid-rotor multi-species...

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Bibliographic Details
Published in:Physics letters. A 2014-06, Vol.378 (32-33), p.2406-2409
Main Authors: Affolter, M., Anderegg, F., Dubin, D.H.E., Driscoll, C.F.
Format: Article
Language:English
Subjects:
Centrifugal separation
Charge
Charge density
Cyclotron frequency
Cyclotron mode
Cyclotrons
Frequency shift
Mass spectrometry
Nonneutral
Plasma
Plasma density
Plasmas
Solid state physics
Space charge
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Summary:In trapped plasmas, electric fields and collective effects shift the cyclotron mode frequencies away from the “bare” cyclotron frequency for each species s. Here, these shifts are measured on a set of cyclotron modes (m=0,1, and 2) with cos(mθ) azimuthal dependence in near rigid-rotor multi-species ion plasmas. We observe that these frequency shifts are dependent on the plasma density, through the E×B rotation frequency fE, and on the “local” charge concentration δs of species s, in close agreement with theory. •Cyclotron modes varying as sin(mθ) with m=0,1and2 are detected.•These mode frequencies shift by factors of the ExB rotation frequency.•These frequency shifts depend on the species charge fraction and radial distribution.•Centrifugal separation of species can greatly modify these frequency shifts.
ISSN:0375-9601
1873-2429
DOI:10.1016/j.physleta.2014.06.015