Properties of axisymmetric Bernstein modes in an infinitelength nonneutral plasma
We have observed axisymmetric Bernstein modes in an infinitelength particleincell code simulation of a nonneutral plasma. The plasmas considered were in global thermal equilibrium and there were at least 50 Larmor radii within the plasma radius. The density of the plasma in the simulation is parameterized by β, the ratio of the central density to the density at the Brillouin limit. These modes have m = 0 and k{sub z}=0, where the eigenfunctions vary as e{sup i(mθ+k{sub z}z)}. The modes exist both near the Coriolisshifted (by the plasma rotation) upperhybrid frequency, ω{sub uh}=√(ω{sub c}{sup 2}−ω{sub p}{sup 2}), and near integer multiples (2, 3, etc.) of the Coriolisshifted cyclotron frequency (called the vortex frequency, ω{sub v}=√(ω{sub c}{sup 2}−2ω{sub p}{sup 2})). The two modes near ω{sub uh} and 2ω{sub v} are the main subject of this paper. The modes observed are clustered about these two frequencies and are separated in frequency at low plasma density roughly by δω≈10(r{sub L}/r{sub p}){sup 2}ω{sub p}{sup 2}/ω{sub c}. The radial velocity field of the modes has a J{sub 1}(kr) dependence in the region of the plasma where the density is nearly constant. For any given density, there are three classes of modes that exist: (1) Themore »
 Authors:

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^{[1]}
 Department of Physics and Astronomy, Brigham Young University, Provo, Utah 84602 (United States)
 Publication Date:
 OSTI Identifier:
 22218493
 Resource Type:
 Journal Article
 Resource Relation:
 Journal Name: Physics of Plasmas; Journal Volume: 20; Journal Issue: 10; Other Information: (c) 2013 AIP Publishing LLC; Country of input: International Atomic Energy Agency (IAEA)
 Country of Publication:
 United States
 Language:
 English
 Subject:
 70 PLASMA PHYSICS AND FUSION TECHNOLOGY; 71 CLASSICAL AND QUANTUM MECHANICS, GENERAL PHYSICS; AXIAL SYMMETRY; BERNSTEIN MODE; BOLTZMANNVLASOV EQUATION; EIGENFUNCTIONS; EIGENVALUES; LARMOR RADIUS; PLASMA DENSITY; PLASMA SIMULATION; PLASMA WAVES; RADIAL VELOCITY; RESONANCE; TENSORS; THERMAL EQUILIBRIUM; VORTICES