Long-pulse operation of a 0.5 MW TE{sub 10.4} gyrotron at 140 GHz

Journal Article · Sat Jun 01 04:00:00 EDT 1996 · IEEE Transactions on Plasma Science

DOI:https://doi.org/10.1109/27.532939· OSTI ID:377814

Dammertz, G; Iatrou, C T; Kuntze, M; Moebius, A; Piosczyk, B ^[1]; Braz, O; Thumm, M ^[1]

---

1. 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, Journal Name: IEEE Transactions on Plasma Science Journal Issue: 3 Vol. 24; ISSN ITPSBD; ISSN 0093-3813
• Country of Publication: United States
• Language: English

Related Subjects

70 PLASMA PHYSICS AND FUSION TECHNOLOGY
ECR HEATING
EXPERIMENTAL DATA
MICROWAVE AMPLIFIERS
MODE CONVERSION
OPERATION
OSCILLATION MODES
PERFORMANCE
PLASMA DIAGNOSTICS
WENDELSTEIN-7 STELLARATOR