Operation of a quasioptical electron cyclotron maser

Conference · Sat Dec 01 00:00:00 EST 1984

OSTI ID:5948620

Morse, E C; Pyle, R V

The electron cyclotron maser or gyrotron concept has been developed to produce sources producing 200 kW at 28 GHz continuously, and higher power outputs and frequencies in pulsed mode. These sources have been useful in electron cyclotron resonance heating (ECRH) in magnetically confined fusion devices. However, higher frequencies and higher power levels will be required in reactor-grade fusion plasmas, with likely requirements of 1.0 MW or more per source at 140 GHz. Conventional gyrotrons follow a trend of decreasing power for increasing frequency. In order to circumvent this problem, the quasioptical electron cyclotron maser was proposed. In this device, the closed resonator of the conventional gyrotron is replaced with an open, Fabry-Perot type resonator. The cavity modes are then the TEM-type modes of an optical laser. The advantage of this configuration is that the cavity size is not a function of frequency, since the length can be any half-integer number of wavelengths. Furthermore, the beam traverses across the cavity transverse to the direction of radiation output, and thus the rf window design is less complicated than in conventional tubes. The rf output, if obtained by diffraction coupling around one of the mirrors, could be in a TEM mode, which would allow for quasioptical transmission of the microwaves into the plasma in fusion devices. 4 references, 1 figure.

• Research Organization: Lawrence Berkeley Lab., CA (USA)
• DOE Contract Number: AC03-76SF00098
• OSTI ID: 5948620
• Report Number(s): LBL-18490; CONF-841218-26; ON: DE85008450
• Resource Relation: Conference: 31. national vacuum symposium, Reno, NV, USA, 3 Dec 1984
• Country of Publication: United States
• Language: English

Related Subjects

42 ENGINEERING
CYCLOTRONS
MASERS
CAVITY RESONATORS
DESIGN
ELECTRON BEAMS
MICROWAVE AMPLIFIERS
POWER RANGE 100-1000 KW
RF SYSTEMS
ACCELERATORS
AMPLIFIERS
BEAMS
CYCLIC ACCELERATORS
ELECTRONIC EQUIPMENT
EQUIPMENT
LEPTON BEAMS
MICROWAVE EQUIPMENT
PARTICLE BEAMS
RESONATORS
420800* - Engineering- Electronic Circuits & Devices- (-1989)