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Abstract

We briefly derive the starting conditions for secondary electron multiplication at cyclotron resonance, i.e. the formation of "multipactors" in waveguides traversing a magnetic field. The transverse energy gain of the electrons in resonance layers leads to large angles of incidence on the waveguide walls, thereby increasing the yield of secondary electrons as needed to start a multipactor. A method is described to suppress these electrons by self-absorption in a coarse grained surface coating. We report on the fabrication of such metal coatings by electrochemical deposition in waveguides. This technique has been applied successfully in the fabrication of the LH antenna for the ASDEX Tokamak.

Additional information

Authors: DERFLER H, MAX-PLANCK-INSTITUT FUER PLASMAPHYSIK, GARCHING BEI MUENCHEN (GERMANY);BRINKSCHULTE H, MAX-PLANCK-INSTITUT FUER PLASMAPHYSIK, GARCHING BEI MUENCHEN (GERMANY);LEUTERER F, MAX-PLANCK-INSTITUT FUER PLASMAPHYSIK, GARCHING BEI MUENCHEN (GERMANY);PERCHERMEIER J, MAX-PLANCK-INSTITUT FUER PLASMAPHYSIK, GARCHING BEI MUENCHEN (GERMANY);SPITZER H MAX-PLANCK-INSTITUT FUER PLASMAPHYSIK, GARCHING BEI MUENCHEN (GERMANY), MAX-PLANCK-INSTITUT FUER PLASMAPHYSIK, GARCHING BEI MUENCHEN (GERMANY)
Bibliographic Reference: 4TH INTERNATIONAL SYMPOSIUM ON HEATING IN TOROIDAL PLASMAS, ROMA (ITALY), MARCH 21-28, 1984 VOL. II, PP. 1261-1269 1478 P., VOL. I AND VOL. II, 1984 WRITE TO MONOTYPIA FRANCHI, ST. LUCIA - VIALE UMBRIA NO. 28, 06012 CITTA DI CASTELLO, PERUGIA (ITALY), PRI
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