Implementation of LHCD Experiments on Alcator C-Mod

An antenna-transmitter system for driving current in the LHRF has been installed in Alcator C-Mod. The antenna is a grill consisting of 4 poloidal rows of waveguides, each with 24 guides in the toroidal direction. Power is supplied by 12 klystrons capable of 250 kW operation at a frequency of 4.6 GH...

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Bibliographic Details
Published in:AIP conference proceedings 2005-09, Vol.787 (1)
Main Authors: Parker, R., Basse, N., Beck, W., Childs, R., Grimes, M., Gwinn, D., Irby, J., Koert, P., Labombard, B., Liptac, J., Marmar, E., Terry, D., Terry, J., Vieira, R., Wallace, G., Wilson, J.R., Zaks, J., Bernabei, S., Ellis, R., Fredd, E.
Format: Article
Language:English
Subjects:
70 PLASMA PHYSICS AND FUSION TECHNOLOGY
ALCATOR DEVICE
ANTENNAS
ELECTRIC CURRENTS
GHZ RANGE
HIGH-FREQUENCY HEATING
IMPLEMENTATION
KLYSTRONS
LOWER HYBRID CURRENT DRIVE
PLASMA
PULSES
RF SYSTEMS
WAVEGUIDES
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Summary:An antenna-transmitter system for driving current in the LHRF has been installed in Alcator C-Mod. The antenna is a grill consisting of 4 poloidal rows of waveguides, each with 24 guides in the toroidal direction. Power is supplied by 12 klystrons capable of 250 kW operation at a frequency of 4.6 GHz. Thus the total source power is 3 MW, with about 1.5 MW available to be coupled to the plasma. Power supply and heat throughput limits in C-Mod limit the pulse length to 5 s, which however represents several current redistribution times. With 90 deg. phasing, the n parallel spectrum is sharply peaked at 2.3 and the range 1.5 < n parallel < 3.5 can be accessed dynamically by varying the phase of the klystrons. The system is in the commissioning phase with klystron power limited to {approx}20 kW and pulse length to 10 ms. Early results from plasma operation are discussed.
ISSN:0094-243X
1551-7616
DOI:10.1063/1.2098250