Abstract
In this work we use nonlinear sheath capacitance properties in low density plasma to produce parametric amplification of an r.f. signal in the high frequency band (H.F.).The experiment has been carried out in the linear mirror device LISA of the Universidade Federal Fluminense (UFF), where a helium plasma was produced by a radio-frequency source of 30 MHz with a power which can be varied from 10 watts to 100 watts.The experimental results show a r.f. signal amplification at 5 MHz with a transducer gain of 5.7. It shows good agreement with the theoretical results of a classical analysis of parametric amplification with a nonlinear device.
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