Long-pulse operation of a gyrotron with beam/rf separation
- Varian Associates, Inc., Palo Alto, CA (United States)
Varian is carrying out the development of high-power, cw gyrotrons at frequencies ranging from 85--140 GHz. An experimental tube employing a TE[sub 22,2,1]-mode cavity and utilizing an output coupling concept where the collection of the spent electron beam is separated from the outgoing microwave power, has been designed and constructed. In initial tests on the tube, output powers of 450--500 kW have been obtained for pulse durations out to 2.5 seconds, in the desired TE[sub 22,2,1] mode at a frequency of 110 GHz. Electron cyclotron resonance heating (ECRH) requirements for planned magnetic fusion experiments such as the International Thermonuclear Experimental Reactor (ITER) will require millimeter-wave sources capable of output powers of at least 1 MW cw at frequencies in the range, 100-200 GHz. Initial megawatt-level development work at Varian resulted in a gyrotron design that was tested to output powers of 21 MW for short pulses ([approximately]1 ms) and 400 kW for 0.5-s pulses at a frequency of 140 GHz. Output powers up to 1 MW have been achieved for short pulses (1 ms). Future tests on this and subsequent experimental tubes will be aimed at achieving 1 MW power levels under long-pulse and ultimately, cw conditions.
- Research Organization:
- Lawrence Livermore National Lab., CA (United States)
- Sponsoring Organization:
- USDOE; USDOE, Washington, DC (United States)
- DOE Contract Number:
- W-7405-ENG-48
- OSTI ID:
- 6429233
- Report Number(s):
- UCRL-CR-111879; ON: DE93015007
- Country of Publication:
- United States
- Language:
- English
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Millimeter-wave, megawatt gyrotron development for ECR (electron cyclotron resonance) heating applications
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Related Subjects
ITER TOKAMAK
ECR HEATING
MICROWAVE AMPLIFIERS
DESIGN
OPERATION
PERFORMANCE TESTING
ELECTRON BEAMS
GHZ RANGE 100-1000
POWER RANGE 01-10 MW
PULSES
AMPLIFIERS
BEAMS
CLOSED PLASMA DEVICES
ELECTRONIC EQUIPMENT
EQUIPMENT
FREQUENCY RANGE
GHZ RANGE
HEATING
HIGH-FREQUENCY HEATING
LEPTON BEAMS
MEGAWATT POWER RANGE
MICROWAVE EQUIPMENT
PARTICLE BEAMS
PLASMA HEATING
POWER RANGE
TESTING
THERMONUCLEAR DEVICES
TOKAMAK DEVICES
700350* - Plasma Production
Heating
Current Drive
& Interactions- (1992-)