Upgrade of the ICRF fault and control systems on alcator C-mod
Name
Murray-2009-New alcator C-mod rotated 10 4-strap ICRF antenna.pdf
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249.66 KB
Format
Adobe PDF
Checksum (MD5)
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Author(s)
Wukitch, Stephen James
Murray, Richard A.
Kanojia, Atma Dakshineshwar
Burke, William M.
Binus, Alan
Parkin, B.
Lin, Y.
Terry, David Rankin
Date Issued
August 2009
Journal
23rd IEEE/NPSS Symposium on Fusion Engineering, 2009. SOFE 2009
Publisher
Institute of Electrical and Electronics Engineers
Citation
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.
Version
Final published version
Abstract
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.
Subjects
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
MIT Department
Massachusetts Institute of Technology. Plasma Science and Fusion Center
Terms of Use
Article is made available in accordance with the publisher's policy and may be subject to US copyright law. Please refer to the publisher's site for terms of use.
Persistent DSpace Link
DOI of Published Version
https://doi.org/10.1109/FUSION.2009.5226411
