Implementation of LHCD Experiments on Alcator C-Mod

Journal Article · Mon Sep 26 04:00:00 EDT 2005 · AIP Conference Proceedings

DOI:https://doi.org/10.1063/1.2098250· OSTI ID:20726337

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 ^[1]; Bernabei, S; Ellis, R; Fredd, E ^[2]

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1. Plasma Science and Fusion Center, MIT, Cambridge, MA (United States)
2. Princeton Plasma Physics Laboratory, Princeton University, Princeton, NJ (United States)

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.

• OSTI ID: 20726337
• Journal Information: AIP Conference Proceedings, Journal Name: AIP Conference Proceedings Journal Issue: 1 Vol. 787; ISSN APCPCS; ISSN 0094-243X
• Country of Publication: United States
• Language: English

Related 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