THE LOWER HYBRID RF HEATING SYSTEM FOR THE ASDEX TOKAMAK
An RF heating system was designed and constructed at IPP Garching to deliver 2.4 MW for 1.5 s every 5 min at a frequency of 1.3 GHz. The system is based on 8 klystron amplifiers each delivering 300 kW pulse power. The klystrons are fed by two thyristor regulated high voltage power supplies. Beam voltage and current are 60 kV and 11 A each klystron. The modulation of the RF exciter gives the right RF pulse shape. Fast crowbar systems protect the klystrons in case of malfunctioning. The klystrons are independently regulated in phase and amplitude by a feedback system. The RF systems feeds the grill antenna by waveguide transmission lines over a distance of 25 m. The losses and the reflection coefficients of the transmission system are 20% and 1%, respectively. The grill antenna consists of eight reduced waveguides which are matched to the standard transmission lines by step transformers. The vacuum sealing to the ASDEX machine is made by standard alumina microwave windows.
Bibliographic Reference: 4TH INTERNATIONAL SYMPOSIUM ON HEATING IN TOROIDAL PLASMAS, ROMA (ITALY), MARCH 21-28, 1984 VOL. II, PP. 1183-1190 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
Record Number: 1989124035900 / Last updated on: 1987-01-01
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