NDLI: Lower Hybrid Current Drive on Alcator C-Mod: System Design, Implementation, Protection, Calibration and Performance

Content Provider	IEEE Xplore Digital Library
Author	Terry, D.R. Burke, W. Kanojia, A. MacGibbon, P. Johnson, D. Parker, R.R. Vieira, R.F. Wallace, G. Beck, W. Koert, P. Irby, J. Wilson, J.R. Greenough, N. Gwinn, D.
Copyright Year	2007
Description	Author affiliation: Massachusetts Inst. of Technol., Cambridge (Terry, D.R.; Burke, W.; Kanojia, A.; MacGibbon, P.; Johnson, D.; Parker, R.R.; Vieira, R.F.; Wallace, G.; Beck, W.; Koert, P.; Irby, J.)
Abstract	A 4.6 GHz 3 MW lower hybrid current drive (LHCD) system has been designed and implemented on Alcator C-Mod. This RF system will allow C-Mod to access advanced tokamak regimes: high confinement, high $beta_{n},$ and high bootstrap fraction and extend them to quasi-steady-state conditions. The LHCD system includes twelve 250 kW klystrons. Power from each klystron is split eight ways using a complex system of waveguides to drive a 96-window coupler array. The amplitude and relative phasing of each klystron is controlled by a computer-based system using I-Q vector modulators and is monitored by I-Q detectors to control the $n_{par}$ spectrum applied to the plasma. Calibration is accomplished using a network analyzer in conjunction with software programs to generate two-dimensional lookup tables that allow compensation for system non-linearities. Forward and reflected powers are monitored to protect the klystrons, waveguides and coupler array from arcing. During the 2006 experimental campaign, nearly 1 MA of current was driven into Alcator C-Mod plasma using 800 kW of coupled RF power.
Starting Page	1
Ending Page	5
File Size	1684206
Page Count	5
File Format	PDF
ISBN	9781424411931
DOI	10.1109/FUSION.2007.4337922
Language	English
Publisher	Institute of Electrical and Electronics Engineers, Inc. (IEEE)
Publisher Date	2007-06-17
Publisher Place	USA
Access Restriction	Subscribed
Rights Holder	Institute of Electrical and Electronics Engineers, Inc. (IEEE)
Subject Keyword	Protection Calibration Klystrons Radio frequency Control systems Plasma waves Tokamaks Amplitude modulation Computerized monitoring Detectors lower hybrid current drive
Content Type	Text
Resource Type	Article

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4	Project PI / Joint PI	Principal Investigator and Joint Principal Investigators of the project	Dr. B. Sutradhar bsutra@ndl.gov.in Prof. Saswat Chakrabarti will be added soon
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