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Abstract

ECRH experiments on the W VII-A stellarator use the linearly polarized TE-11 wave which is radiated from the low field side into the torus in O-mode polarization. The electric field vector of the unabsorbed fraction of the wave is rotated by 90 degrees by a spherical polarization twist reflector. The reflected wave is then in X-mode polarization and suited to study plasma heating by mode conversion into electron Bernstein waves. The reflected beam is focussed so that a high local power concentration can be achieved. The twist reflector, mounted to the inner torus wall, is provided with three coupling holes. Their signals allow the adjustment and control of the antenna beam pattern and they provide information on the deflection and absorption of the wave during plasma build-up.

Additional information

Authors: SCHUELLER P G, INSTITUT FUER PLASMAFORSCHUNG, UNIVERSITAET STUTTGART (GERMANY);ERCKMANN V, INSTITUT FUER PLASMAFORSCHUNG, UNIVERSITAET STUTTGART (GERMANY);JANZEN G, INSTITUT FUER PLASMAFORSCHUNG, UNIVERSITAET STUTTGART (GERMANY);MUELLER G, INSTITUT FUER PLASMAFORSCHUNG, UNIVERSITAET STUTTGART (GERMANY);RAEUCHLE E, INSTITUT FUER PLASMAFORSCHUNG, UNIVERSITAET STUTTGART (GERMANY);THUMM M, INSTITUT FUER PLASMAFORSCHUNG, UNIVERSITAET STUTTGART (GERMANY);WILHELM R INSTITUT FUER PLASMAFORSCHUNG, UNIVERSITAET STUTTGART (GERMANY), INSTITUT FUER PLASMAFORSCHUNG, UNIVERSITAET STUTTGART (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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