Development of advanced high-power 140-GHz gyrotrons for ECW applications

Michael Kuntze; O. Braz; G. Dammertz; C. Iatrou; Stefan Kern; Arnold Moebius; B. Piosczyk; G. Soudee; Manfred Thumm; A. Wien

doi:10.1117/12.218573

8 September 1995 Development of advanced high-power 140-GHz gyrotrons for ECW applications

Michael Kuntze, O. Braz, G. Dammertz, C. Iatrou, Stefan Kern, Arnold Moebius, B. Piosczyk, G. Soudee, Manfred Thumm, A. Wien

Author Affiliations +

Proceedings Volume 2557, Intense Microwave Pulses III; (1995) https://doi.org/10.1117/12.218573
Event: SPIE's 1995 International Symposium on Optical Science, Engineering, and Instrumentation, 1995, San Diego, CA, United States

Abstract

A TE_10,4 gyrotron oscillator with advanced built-in quasi-optical mode converter and radial output coupling into a Gaussian mode (94.5% mode purity) has been operated at 0.46 MW with 200 ms pulse duration and total output efficiency 32% (38% electronic efficiency). The maximum output power was 0.6 MW (12 ms) at 27% output efficiency. In first proof of principle experiments this total tube efficiency was improved to 51% by the use of a single- stage potential depressed collector. In short pulse experiments (10 ms) with a TE_22,6 mode cavity about 1 MW output power was generated at 140.1 GHz with U_b equals 85 kV and I_b equals 53 A. Modes of type TE_m,6 with m equals 20 to 26 were excited in the frequency range between 136 GHz and 155 GHz with output powers of 500-600 kW at I_b equals 40 A. The measurements were carried out with a single disk output window and a nonimproved quasi-optical mode converter. First short pulse experiments with a coaxial cavity gyrotron designed for 1.5 MW output power gave 1 MW at 140 GHz (TE_28,16) and 1.3 MW at 166 GHz (TE_27,15) with efficiencies of 23% and 29% respectively.

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Michael Kuntze, O. Braz, G. Dammertz, C. Iatrou, Stefan Kern, Arnold Moebius, B. Piosczyk, G. Soudee, Manfred Thumm, and A. Wien "Development of advanced high-power 140-GHz gyrotrons for ECW applications", Proc. SPIE 2557, Intense Microwave Pulses III, (8 September 1995); https://doi.org/10.1117/12.218573

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