Potential-confined cold plasma stabilization of loss-cone modes in mirror machines

1979 ◽  
Vol 22 (1) ◽  
pp. 119 ◽  
Author(s):  
David E. Baldwin ◽  
Raynard A. Jong
Keyword(s):  
Cold Plasma ◽  
Loss Cone ◽  
Plasma Stabilization ◽  
Mirror Machines

Electrostatic instabilities in anti-loss-cone plasma

1978 ◽  
Vol 19 (2) ◽  
pp. 193-199 ◽  
Author(s):  
K. G. Bhatia ◽  
G. S. Lakhina
Keyword(s):  
Plasma Density ◽  
Growth Rates ◽  
Cold Plasma ◽  
Lower Hybrid ◽  
Loss Cone ◽  
Trapped Electrons ◽  
A Value ◽  
Acoustic Instabilities ◽  
Electron Acoustic

It is shown that both lower hybrid and modified electron acoustic instabilities can be excited in a hot anti-loss-cone plasma co-existing with a rarefied cold plasma, provided the anti-loss-cone factor, ρ, exceeds a value Tm/Tt, where Tm and Tt are the parallel temperatures of missing and trapped electrons respectively. These instabilities are excited in a bounded range of wavenumbers and the growth rates are enhanced with the increase of cold plasma density. ForTm/Tt < ρ > (Tm/Tt)½both the instabilities are of resonant type whereas for ρ > (Tm/Tt)½ both may be converted into non-resonant types. These instabilities are expected to give rise to the heating of protons as well as electrons in the magnetosphere beyond the plasmapause.

High-frequency ion electrostatic instabilities in mixed warm–cold plasma

1976 ◽  
Vol 15 (3) ◽  
pp. 325-333 ◽  
Author(s):  
L. Gomberoff ◽  
S. Cuperman
Keyword(s):  
Distribution Function ◽  
High Frequency ◽  
Cold Plasma ◽  
Loss Cone ◽  
Electrostatic Waves ◽  
High Frequencies ◽  
Proton Gyrofrequency

It is shown that an ion loss cone distribution function with m ≥ 1 becomes unstable against electrostatic waves with ω ≫ Ωp and k0 = 0 in the presence of a cold plasma population, in contrast with pure warm systems, which require m ≥ 3 for instability. This result is an extension to high frequencies, ω ≫ Ω of similar conclusions reached by Pearlstein et al. (1966) and Farr & Budwine (1968), for ω-values equal to the first few harmonics of the proton gyrofrequency.

Electron cyclotron waves: dispersion and accessibility conditions in isotropic and anisotropic plasmas

1986 ◽  
Vol 35 (2) ◽  
pp. 187-207 ◽  
Author(s):  
P. A. Robinson
Keyword(s):  
Mode Coupling ◽  
Cold Plasma ◽  
Electron Cyclotron ◽  
Isotropic Case ◽  
Mode Structure ◽  
Loss Cone ◽  
Relativistic Plasmas ◽  
Low Field ◽  
Plasma Theory ◽  
Electron Cyclotron Waves

Dispersion and accessibility conditions for electron cyclotron waves are investigated for arbitrary weakly relativistic plasmas and for specific isotropic and loss-cone distributions. The transition between the cold plasma and vacuum dispersion relations is investigated as a function of temperature and density. The behaviour of mode structure (including mode coupling), cut-offs and resonances are also examined. Generalizations are obtained of earlier results which indicate that access by extraordinary waves to regions nearthe cyclotron layer from the low-field side is easier in weakly relativistic plasmas than predicted by cold plasma theory because of a reduction in the cut-off frequency of the fast extraordinary mode. This effect is found to be more pronounced in loss-cone distributions than in isotropic distributions, permitting access at temperatures considerably lower than those predicted in the isotropic case. Extra loss-cone modes are found to appear near the cyclotron frequency in loss-cone plasmas which also exhibit instabilities near the cyclotron harmonics.

Cold plasma stabilization of a mirror-confined, hot-electron plasma

1976 ◽  
Vol 19 (8) ◽  
pp. 1203 ◽  
Author(s):  
I. G. Brown ◽  
A. J. Lichtenberg ◽  
M. A. Lieberman ◽  
N. Convers Wyeth
Keyword(s):  
Cold Plasma ◽  
Electron Plasma ◽  
Hot Electron ◽  
Plasma Stabilization
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