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Abstract

Electron cyclotron emission measurements from high density discharges (electron density n-e greater or about 8x 10**19 m**-3) in the ASDEX Tokamak are analyzed. The diagnostic is found to be resilient to the effects of plasma refraction. In particular, reliable electron temperatures may be derived from the second cyclotron harmonic in the plasma until electron densities within 4 % of the critical density for the existence of the right hand, or upper, cut-off are encountered. Comparisons of experimental observations with predictions of a newly developed two-dimensional emission code incorporating refraction yield very good agreement between the two.

Additional information

Authors: CAMPBELL D J EURATOM-IPP, GARCHING BEI MUENCHEN (D) EBERHAGEN A JET JOINT UNDERTAKING, ABINGDON (UK) , EURATOM-IPP, GARCHING BEI MUENCHEN (D);JET JOINT UNDERTAKING, ABINGDON (UK)
Bibliographic Reference: PLASMA PHYSICS AND CONTROLLED FUSION, VOL. 26 (1984) NO. 5, PP. 689-702
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