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The relaxation of a perturbed distribution function of the quantities of movement towards a non-perturbed state (assumed to be Maxwellian) generally depends on the local plasma parameters. This suggests that the plasma could be diagnosed by studying the transient emission (or absorption) of synchrotron radiation resulting from changes in the distribution of the quantities of movement. The initial perturbation can be brought about by means of resonant absorption of a pulse from an electron cyclotron wave or a lower hybrid wave. Synchrotron emission by a thermonuclear reactor plasma disturbed by a lower hybrid wave has already been studied. However, the conditions for the practical application of the method have not yet been considered. One essential prerequisite is that the radiation should be detectable outside the plasma, i.e. that the optical density is well below 2. Radiation emitted by the core of the plasma is strongly absorbed by the rest of the plasma and thus cannot be detected outside the plasma. This is a study of the frequency range within which emission or transmission of synchrotron radiation can be used for the diagnosis of a hot Maxwellian plasma (T(e) above 20keV).

Additional information

Authors: FIDONE I, CEA, Département de Recherches sur la Fusion Contrôlée, Saint-Paul-lez- Durance (FR);MEYER R L, Laboratoire de Physique des Milieux Ionises, Nancy (FR)
Bibliographic Reference: Paper presented: 2ème Congrès de la Division de Plasma, Orsay (FR), Sept. 3-4, 1990
Availability: Text not available
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