Long-pulse operation of a 0.5 MW TE{sub 10.4} gyrotron at 140 GHz
- Forschungszentrum Karlsruhe-Association EURATOM-FZK (Germany). Inst. fuer Technische Physik
Gyrotron oscillators have proven to be highly efficient sources of coherent mm-wave radiation. They have been used successfully for electron cyclotron resonance heating (ECRH) experiments and electron cyclotron diagnostics (ECD) of plasma fusion for some time. Due to the localized energy deposition, the temperature profile can be modified and the stability of the plasma can be improved. Here, the operation features of a TE{sub 10.4}-mode gyrotron oscillator with a quasi-optical mode converter and a single-stage depressed collector at 140 GHz with an output power of 500 kW in long pulses of 0.2 s are presented. Measurements on long-pulse operation of the tube are described in detail, and the significant differences between short- and long-pulse operation concerning efficiency and output power are pointed out. The variation of frequency during a pulse and an irreversible frequency shift during long-pulse operation were measured and are discussed with respect to gyrotron design.
- OSTI ID:
- 377814
- Journal Information:
- IEEE Transactions on Plasma Science, Vol. 24, Issue 3; Other Information: PBD: Jun 1996
- Country of Publication:
- United States
- Language:
- English
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