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Proceedings Paper

Development of advanced high-power 140-GHz gyrotrons for ECW applications
Author(s): Michael Kuntze; O. Braz; G. Dammertz; C. Iatrou; Stefan Kern; Arnold Moebius; B. Piosczyk; G. Soudee; Manfred Thumm; A. Wien
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Paper Abstract

A TE10,4 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 TE22,6 mode cavity about 1 MW output power was generated at 140.1 GHz with Ub equals 85 kV and Ib equals 53 A. Modes of type TEm,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 Ib 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 (TE28,16) and 1.3 MW at 166 GHz (TE27,15) with efficiencies of 23% and 29% respectively.

Paper Details

Date Published: 8 September 1995
PDF: 9 pages
Proc. SPIE 2557, Intense Microwave Pulses III, (8 September 1995); doi: 10.1117/12.218573
Show Author Affiliations
Michael Kuntze, Forschungszentrum Karlsruhe (Germany)
O. Braz, Forschungszentrum Karlsruhe and Univ. Karlsruhe Technische Hochschule (Germany)
G. Dammertz, Forschungszentrum Karlsruhe (Germany)
C. Iatrou, Forschungszentrum Karlsruhe (Germany)
Stefan Kern, Forschungszentrum Karlsruhe and Univ. Karlsruhe Technische Hochschule (Germany)
Arnold Moebius, Forschungszentrum Karlsruhe (Germany)
B. Piosczyk, Forschungszentrum Karlsruhe (Germany)
G. Soudee, Forschungszentrum Karlsruhe (Germany)
Manfred Thumm, Forschungszentrum Karlsruhe and Univ. Karlsruhe Technische Hochschule (Germany)
A. Wien, Forschungszentrum Karlsruhe and Univ. Karlsruhe Technische Hochschule (Germany)


Published in SPIE Proceedings Vol. 2557:
Intense Microwave Pulses III
Howard E. Brandt, Editor(s)

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