Direct excitation and propagation of ion Bernstein waves from low‐impedance current‐carrying loop antennas in the ion cyclotron frequency range are studied over a range of plasma and antenna parameters. The dependence of wave coupling efficiency on plasma density and on wave frequency and parallel wavelength is obtained from measurements of wave amplitude and variations in antenna impedance. Comparisons are made to a simple nonuniform warm‐plasma model of the coupling problem. Generally good agreement is found between theory and experiment. As a result, some guidelines are proposed concerning antenna design.
REFERENCES
1.
M.
Ono
, G. A.
Wurden
, and K. L.
Wong
, Phys. Rev. Lett.
52
, 37
(1984
);M.
Ono
, T.
Watari
, R.
Ando
, J.
Fujita
, Y.
Hiroura
, K.
Ida
, E.
Kako
, K.
Kawahata
, Y.
Kawasumi
, K.
Matsuoka
, A.
Nishizawa
, N.
Noda
, I.
Ogawa
, K.
Ohkubo
, M.
Okamoto
, K.
Sato
, S.
Tanahashi
, Y.
Taniguchi
, T.
Tetsuka
, K.
Toi
, and K.
Yamazaki
, Phys. Rev. Lett.
54
, 2339
(1985
).2.
3.
T.
Watari
, T.
Hatori
, R.
Kumazawa
, S.
Hidekuma
, T.
Aoki
, T.
Kawamoto
, M.
Inutake
, S.
Hiroe
, A.
Nishizawa
, K.
Adati
, T.
Sato
, T.
Watanabe
, H.
Obayashi
, and K.
Takayama
, Phys. Fluids
21
, 2076
(1978
).4.
F. Skiff, M. Ono, and K. L. Wong, in Proceedings of the Sixth Topical Conference on Radio Frequency Plasma Heating, 1985, AIP Conference Proceedings 129 (American Institute of Physics, New York, 1985), p. 91; F. Skiff, Ph.D. thesis, Princeton University, 1985.
5.
K. L.
Wong
, M.
Ono
, and G. A.
Wurden
, Rev. Sci. Instrum.
53
, 409
(1982
).6.
T. H. Stix, The Theory of Plasma Waves (McGraw‐Hill, New York, 1962).
7.
8.
F.
Skiff
, M.
Ono
, P.
Colestock
, and K. L.
Wong
, Phys. Fluids
28
, 2453
(1985
).9.
E. L. Ince, Ordinary Differential Equations (Dover, New York, 1956), p. 122.
10.
11.
This content is only available via PDF.
© 1988 American Institute of Physics.
1988
American Institute of Physics
You do not currently have access to this content.