Upgrade of the ICRF fault and control systems on alcator C-mod
Author(s)Wukitch, Stephen James; Murray, Richard A.; Kanojia, Atma Dakshineshwar; Burke, William M.; Binus, Alan; Parkin, B.; Lin, Y.; Terry, David Rankin; ... Show more Show less
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The Ion Cyclotron RF Transmitter System (ICRF) at Alcator C-Mod comprises four separate transmitters each capable of driving 2 MW of power into plasma loads. Four separate transmission lines guide RF power into three antennas, each mounted in a separate horizontal port, in the C-Mod Tokamak. Protection for the antennas, matching elements and transmission line is accomplished by two unique but interdependent subsystems encompassed by the ICRF Fault System. The Antenna Protection System evaluates antenna phasing and voltage, sets fault thresholds, generates fault signals, and passes fault information to the Master Fault Processor. During operation, the Master Fault Processor is responsible for detecting hazards along the transmission line, generating faults, processing faults from the Antenna Protection System, terminating RF drive and extinguishing faults within 10 mus. In addition, the system controls various delays and sets the boundaries for RF retries. The ICRF Control System provides amplitude regulation for all antennas and phase control for a four-strap antenna. We are modifying some of the fault processing components and control elements of these systems in an effort to improve reliability and serviceability, and increase flexibility. This upgrade will reduce wired interconnections, add remote features to improve access to key operating parameters, improve RF isolation with new switching components, simplify phase control, and expand the RF regulation system to an active control regime whereby plasma parameters may become direct feedback elements for RF regulation. Details of the proposed upgrade to the system will be presented, and implementation of any new technological tools will be discussed.
DepartmentMassachusetts Institute of Technology. Plasma Science and Fusion Center
23rd IEEE/NPSS Symposium on Fusion Engineering, 2009. SOFE 2009
Institute of Electrical and Electronics Engineers
Murray, R.A. et al. “Upgrade of the ICRF fault and control systems on alcator C-Mod.” Fusion Engineering, 2009. SOFE 2009. 23rd IEEE/NPSS Symposium on. 2009. 1-4. © 2010 Institute of Electrical and Electronics Engineers.
Final published version
INSPEC Accession Number: 10844221
Alcator C-Mod, C-Mod tokamak, RF power, RF regulation system, antenna protection system, control systems, fault processing components, feedback elements, four-strap antenna, ion cyclotron RF transmitter system, master fault processor, plasma loads, power 2 MW, switching components, transmission lines
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