TECHNICAL ASPECTS OF ECRH SYSTEMS
A review of Electron-Cyclotron Resonance Heating (ECRH) experiments is presented with emphasis on the technical aspects. EC waves are strongly absorbed in a localized region easily controllable by adjustment of the magnetic field. This enables modification of the electron temperature and thereby of the current density profile. Stabilization of sawteeth and m=2 modes in tokamaks has been realized. Heating of electrons up to temperatures of several KeV and the production of plasma in both tokamaks and stellarators has been realized A review is given of the existing and future ECRH installations and their experimental results. Furthermore, a review is given of the gyrotron development programmes. The output power of most of the gyrotrons is delivered into a vertical oversized cylindrical waveguide in a circular TE-on-mode. This mode is normally converted to the TE-01-mode for transmission with low losses. A further conversion to the linearly polarized TE-11- or HE-11-mode is made to obtain an optimal coupling to the plasma. No mode converters are used in the Soviet Union since these gyrotrons produce a linearly polarized quasi- Gaussian beam through a horizontal output port. Careful control of the various parameters of the gyrotrons allows a stable tube operation and a very high reliability of the entire system.
Bibliographic Reference: 14TH SOFT CONFERENCE, AVIGNON (FRANCE), SEPT. 8-12, 1986 VOL. 1, PP. 75-84 1895 P., 1986, VOL. 1 AND VOL. 2, ISBN 0 08 034935 8 WRITE TO PERGAMON PRESS, HEADINGTON HILL HALL, OXFORD, OX3 0BW (UK), PRICE: UKL 220 (FOR BOTH VOLS.)
Record Number: 1989126047301 / Last updated on: 1989-01-01
Available languages: en