Development of advanced high-power 140 GHz gyrotrons for ECW applications
- Forschungszentrum Karlsruhe (Germany). Inst. fuer Technische Physik
- Univ. Karlsruhe (Germany). Inst. fuer Hoechstfrequenztechnik und Elektronik
A main goal of the gyrotron development program at the Research Center Karlsruhe (FZK) is the design, construction and test of high-power gyrotron oscillators for electron cyclotron wave (ECW) applications and diagnostics of magnetically confined plasmas in controlled thermonuclear fusion research. A TE{sub 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{sub 22,6} mode cavity about 1 MW output power was generated at 140.1 GHz with U{sub b}= 85 kV and I{sub b} = 53 A. Modes of type TE{sub m,6} with m = 20 to 26 were excited in the frequency range between 136 GHz and 155 GHz with output powers of 500-600 kW at I{sub b} = 40 A. The measurements were carried out with a single disk output window and a non improved 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{sub 28,16}) and 1.3 MW at 166 GHz (TE{sub 27,15}) with efficiencies of 23 % and 29 %, respectively.
- OSTI ID:
- 116407
- Report Number(s):
- CONF-950793-; ISBN 0-8194-1916-8; TRN: 95:023106
- Resource Relation:
- Conference: 40. annual meeting of the Society of Photo-Optical Instrumentation Engineers, San Diego, CA (United States), 9-14 Jul 1995; Other Information: PBD: 1995; Related Information: Is Part Of Intense microwave pulses III; Brandt, H.E. [ed.] [Army Research Lab., Adelphi, MD (United States)]; PB: 546 p.; Proceedings/SPIE, Volume 2557
- Country of Publication:
- United States
- Language:
- English
Similar Records
Operation of a 118 GHz - 0.5 MW gyrotron with cryogenic window: Design and long pulse experiments
Cold tests and high power measurements on an advanced quasi-optical mode converter for a 118 GHz gyrotron