RADIATION COUPLING OF BERNSTEIN MODES IN DENSE PLASMAS. Interim Progress Report. Page: 4 of 15
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We attempt a solution of the above problem and adopt the following
model. We assume we can neglect ions as w - Me2. Further, we assume
the plasma to be of the loss cone variety. However, as a first approxi-
mation to the loss-cone distribution we assume a delta function distri-
bution for electrons, i.e. f = S(vz) 6(i-u)/27u. This distribution
obviously will simulate the anisotropy in pitch angle that is character-
istic of the loss-cone-distribution. We also assume wave propagation I to
the static magnetic field; the density inhomogeneity weak and constant in
direction; B = B (l+ex) z, with
E 1 dB=~
and the following geometry z
Vm y-z plane is free surface-
Using the above model, our aim will be to investigate .the. coupling
of a longitudinal mode (the Bernstein mode which propagates at frequency
w ~ m Ve, m = 1,2,3, ...) to an electromagnetic mode which can then propagate
out of the plasma. The main part of the investigation will be a study to
determine which E-M mode is involved, the efficiency of coupling between the
Bernstein mode and E-M mode, and finally a study of the characteristics of the E-M
mode at the plasma-vacuum boundary to see if escape is possible and efficient.
With this model and information we can equally well evaluate the coupling of
external r. f. sources into the plasma at these frequencies to see whether
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Hoffman, J. RADIATION COUPLING OF BERNSTEIN MODES IN DENSE PLASMAS. Interim Progress Report., report, January 1, 1972; United States. (https://digital.library.unt.edu/ark:/67531/metadc1033179/m1/4/: accessed April 25, 2019), University of North Texas Libraries, Digital Library, https://digital.library.unt.edu; crediting UNT Libraries Government Documents Department.