EXCITATION OF THE HALF-FREQUENCY OF THE INPUT SIGNAL IN THE RESPONSE OF AN ANTENNA IMMERSED IN A PLASMA

Authors
  1. Linh, N.P.
  2. Nachman, M.
Corporate Authors
Defence Research Establishment Valcartier, Valcartier QUE (CAN);Ecole Polytechnique, Montreal QUE (CAN) Dept of Electrical Engineering
Abstract
The nonlinear response of a cylindrical monopole antenna immersed in a steady-state collisionless magnetic-field-free plasma and driven by a single-frequency RF source is investigated. The thickness of the ion sheath surrounding the antenna is controlled by a dc bias applied to the latter. It is found that at frequencies of the driving signal close to twice the frequency of a sheath wave resonance, the 1/2-sub-harmonic is excited, provided that the input power level is sufficiently high. The dependence of this process on the sheath thickness and on the electron plasma density is studied in the vicinity of several sheath wave resonances. This nonlinear effect is interpreted as a parametric excitation due to the periodic modulation of the sheath thickness and hence of its capacitance by the applied RF signal. A similar effect can be obtained by replacing the antenna-sheath-plasma structure in the measuring circuit by a variable capacitance diode. TRUNCATED
Date of publication
15 Aug 1990
Number of Pages
9
Reprinted from
IEEE Transactions on Plasma Science, vol 18, no 4, 1990, p 717-724
DSTKIM No
91-03983
CANDIS No
71172
Format(s):
Hardcopy;Originator's fiche received by DSIS

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