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Abstract

Results of electron cyclotron emission (ECE) measurements during low-density non-thermal ASDEX tokamak operation are presented. Particular attention is given to the transition between the thermal plasma state, where the electron velocity distribution is Maxwellian, and the non-thermal state, where the distribution function may be treated as a superposition of low and high energy components. The study is aided by the simultaneous use of two complementary ECE diagnostics, a rapid scan Michelson interferometer for measurement of the entire ECE spectrum and a four-channel polychromator for registration of time- resolved intensities at different wavelengths. Numerical simulations confirm the two-component description of the non-thermal distribution and provide estimates of the population and energy of the high energy part. By comparing X-mode and O-mode radiation, additional information regarding the optical depth of the low energy component is obtained.

Additional information

Authors: CAMPBELL D J, MAX-PLANCK-INSTITUT FUER PLASMAPHYSIK, GARCHING BEI MUENCHEN (GERMANY);JET JOINT UNDERTAKING, CULHAM LABORATORY, ABINGDON (UK);EBERHAGEN A, MAX-PLANCK-INSTITUT FUER PLASMAPHYSIK, GARCHING BEI MUENCHEN (GERMANY);JET JOINT UNDERTAKING, CULHAM LABORATORY, ABINGDON (UK);KISSEL S E MAX-PLANCK-INSTITUT FUER PLASMAPHYSIK, GARCHING BEI MUENCHEN (GERMANY), MAX-PLANCK-INSTITUT FUER PLASMAPHYSIK, GARCHING BEI MUENCHEN (GERMANY);JET JOINT UNDERTAKING, CULHAM LABORATORY, ABINGDON (UK);JET JOINT UNDERTAKING, CULHAM LABORATORY, ABINGDON (UK), MAX-PLANCK-INSTITUT FUER PLASMAPHYSIK, GARCHING BEI MUENCHEN (GERMANY);JET JOINT UNDERTAKING, CULHAM LABORATORY, ABINGDON (UK)
Bibliographic Reference: NUCLEAR FUSION, VOL. 24 (1984), NO. 3. PP. 297-304
Record Number: 1989122106400 / Last updated on: 1987-01-01
Category: PUBLICATION
Available languages: en