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Abstract

Electron temperature profiles measured viewing along the larger radius of W VII-A Stellarator by means of electron cyclotron emission (ECE) deviate characteristically from those obtained via Thomson scattering. As one reason, a small suprathermal population of electrons in addition to the thermalized main part is supposed. To investigate this possibility, the radiation of suprathermal electrons within the electron cyclotron frequency range was calculated in the presence of the thermal background plasma. It was found that the observed deviation can be well explained by such a suprathermal population. By variation of the suprathermal parameters these theoretical spectra were fitted to the experimental ones. The deviation of the measured ECE temperature profiles from those measured by Thomson scattering was then used to estimate density and energy distribution of the suprathermals.

Additional information

Authors: TUTTER M, MAX-PLANCK INSTITUT FUER PLASMAPHYSIK, GARCHING BEI MUENCHEN (GERMANY);HARTFUSS H J, MAX-PLANCK INSTITUT FUER PLASMAPHYSIK, GARCHING BEI MUENCHEN (GERMANY);W VII A TEAM, MAX-PLANCK INSTITUT FUER PLASMAPHYSIK, GARCHING BEI MUENCHEN (GERMANY);NI GROUP MAX-PLANCK INSTITUT FUER PLASMAPHYSIK, GARCHING BEI MUENCHEN (GERMANY), MAX-PLANCK INSTITUT FUER PLASMAPHYSIK, GARCHING BEI MUENCHEN (GERMANY)
Bibliographic Reference: EC-4 + FOURTH INTERNATIONAL WORKSHOP ON ELECTRON CYCLOTRON EMISSION AND ELECTRON CYCLOTRON RESONANCE HEATING, ROMA (ITALY), MARCH 28-30, 1984 WRITE TO ENEA, SERVIZIO STUDI E DOCUMENTAZIONE CENTRO RICERCHE ENERGIA FRASCATI, C.P. 65, 00044 FRASCATI, ROMA (I
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