Optical diagnosis of electrostatic waves in the ion gyrofrequency range via the ion dielectric response
Experiments that utilise Laser Induced Fluorescence (LIF) measurements of a component of the perturbed ion velocity distribution in the fields of externally excited electrostatic waves with frequencies near the ion cyclotron frequency are presented. The distribution function oscillates coherently at the wave frequency. A linear analysis of these coherent fluctuations allows a determination of wave characteristics such as the electric field amplitude and wave vector. Three methods are described which directly indicate wave properties via the perturbed ion distribution and its zero and first order moments. These demonstrate that this non-perturbative diagnostic is a powerful tool in the study of wave excitation and wave particle interactions.
Bibliographic Reference: Report: LRP 367/88 EN (1988)
Availability: Available from Confédération Suisse, Centre de Recherches en Physique des Plasmas, Ecole Polytechnique Fédérale de Lausanne, 21 avenue des Bains, 1007 Lausanne (CH)
Record Number: 198910599 / Last updated on: 1994-12-01
Original language: en
Available languages: en