Cyclotron resonance phenomena in a non-neutral multispecies ion plasma

E. Sarid, F. Anderegg, C. F. Driscoll

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26 Scopus citations


Cyclotron modes of a non-neutral Mg ion plasma were studied in a long cylindrical Penning-Malmberg trap. Several modes with angular dependence exp(ilθ), l ≥ 1, are observed near the cyclotron frequencies of the various Mg ions. The l=1 modes for the majority species are downshifted from the cyclotron frequencies, with downshifts as large as four times the diocotron frequency. These large shifts are quantitatively explained by a multispecies cold-plasma theory, including the dependence on the plasma size and composition. These dependencies allow the plasma size and composition to be obtained from the measured mode frequencies. In contrast, the l=1 downshifts for minority species are generally close to twice the diocotron frequency, and remain unexplained. Cyclotron heating of the plasma ions was also observed with a surprising effect of improving the plasma confinement.

Original languageEnglish
Pages (from-to)2895-2907
Number of pages13
JournalPhysics of Plasmas
Issue number8
StatePublished - 1 Jan 1995
Externally publishedYes

ASJC Scopus subject areas

  • Condensed Matter Physics


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