Development of the high power gyrotron in Switzerland
Two effective methods for heating fusion plasmas require high power, high-frequency oscillators. For electron-cyclotron resonance heating (ECRH), power levels of up to 1 MW per unit in the frequency range between 40 GHz and 150 GHz are required, depending on the magnetic field of the reactor. In the case of lower hybrid heating (LHH) output levels in the megawatts range are also desired for frequencies up to 8 GHz. The only microwave oscillator which can be used in this power and frequency range is the gyrotron. However, technical problems limit the maximum attainable power output of conventional gyrotrons. For this reason further research is being undertaken in Switzerland into conventional as well as quasi-optical gyrotron concepts. The quasi-optical approach offers many advantages, especially at power levels of 1 MW and frequencies of over 70 GHz. For lower output levels and frequencies the conventional construction is usually adequate. This report is designed to present a survey of the present development levels of the quasi-optical 100 GHz and 115 GHz gyrotron and the two conventional 8 GHz and 39 GHz gyrotrons at ABB/CRPP. A summary of the results of these experiments is also provided.
Bibliographic Reference: Paper presented: 11th Conference "Vacuumelectronics and Displays" Garmisch-Partenkirchen (DE), May 8-10, 1989
Availability: Available from (1) as Paper DE 34277 ORA
Record Number: 198910814 / Last updated on: 1994-12-01
Original language: de
Available languages: de