NDLI: Power supply changes for NSTX Resistive Wall Mode Coils

Content Provider	IEEE Xplore Digital Library
Author	Ramakrishnan, S. Neumeyer, C. Mozulay, R. Baker, E. Hatcher, R. Lawson, J. Que, W. Zhao, X.
Copyright Year	2013
Description	Author affiliation: Princeton Plasma Phys. Lab., Princeton, NJ, USA (Ramakrishnan, S.; Neumeyer, C.; Mozulay, R.; Baker, E.; Hatcher, R.; Lawson, J.; Que, W.; Zhao, X.)
Abstract	The National Spherical Torus Experiment (NSTX) has been designed and installed in the existing facilities at Princeton Plasma Physics Laboratory (PPPL). Most of the hardware, plant facilities, auxiliary sub-systems, and power systems originally used for the Tokamak Fusion Test Reactor (TFTR) have been used with suitable modifications to reflect NSTX needs. Prior to 2004, the NSTX power system was feeding twelve (12) circuits in the machine. In 2004 the Resistive Wall Mode (RWM) Coils were installed on the machine to correct error fields. There are six of these coils installed around the machine in the mid-plane. Since these coils need fast and accurate controls, a Switching Power Amplifier (SPA) with three sub-units was procured, installed and commissioned along with other power loop components. Two RWM Coils were connected in series and fed from one SPA sub-unit. After the initial RWM campaign, operational requirements evolved such that each of the RWM coils now requires separate power and control. Hence a second SPA with three sub-units has been procured and installed. The second unit is of improved design and has the controls and power components completely isolated. The existing thyristor rectifier is used as DC Link to both of the Switching Power Amplifiers. The controls for the RWM are integrated into the overall computer control of the DC Power systems for NSTX. This paper describes the design changes in the RWM Power system for NSTX.
Starting Page	1
Ending Page	5
File Size	428121
Page Count	5
File Format	PDF
e-ISBN	9781479901715
DOI	10.1109/SOFE.2013.6635283
Language	English
Publisher	Institute of Electrical and Electronics Engineers, Inc. (IEEE)
Publisher Date	2013-06-10
Publisher Place	USA
Access Restriction	Subscribed
Rights Holder	Institute of Electrical and Electronics Engineers, Inc. (IEEE)
Subject Keyword	Coils Power supplies Optical switches Capacitors Optical fiber cables Feeds
Content Type	Text
Resource Type	Article

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