NDLI: The resistive wall mode feedback control system on DIII-D

Content Provider	IEEE Xplore Digital Library
Author	Scoville, J.T. Kellman, D.H. Pronko, S.G.E. Nerem, A. Hatcher, R. O'Neill, D. Rossi, G. Bolha, M.
Copyright Year	1999
Description	Author affiliation: Gen. Atomics, San Diego, CA, USA (Scoville, J.T.)
Abstract	One of the primary instabilities limiting the performance of the plasma in advanced tokamak operating regimes is the resistive wall mode (RWM). The most common RWM seen in the DIII-D tokamak is originated by an n=1 ideal external kink mode which, in the presence of a resistive wall, is converted to a slowly growing RWM. The mode causes a reduction in plasma rotation, a loss of stored energy, and sometimes leads to plasma disruption. It routinely limits the performance of a tokamak operating near reactor relevant parameter levels. A system designed to actively control the RWM has recently been installed on the DIII-D tokamak for the control of low m n=1 modes. In initial experiments, the control system has been capable of delaying the onset of RWMs in energetic discharges for several hundred milliseconds. The feedback control system consists of detector coils connected via control software to high power current amplifiers driving the excitation coils. The three pairs of excitation coils are each driven by a current amplifier and a DC power supply. The control signal is derived from a set of six sensor coils that measure radial flux as low as one Gauss. The signals are digitally processed by real-time software in the DIII-D Plasma Control System (PCS) to create a command that is sent to the current amplifier, with a cycle time of approximately 100 /spl mu/s. The amplifiers, designed and fabricated by Robicon Corporation to a specification developed by PPPL and GA, are bipolar devices capable of /spl plusmn/5 kA at 300 V, with an operating bandwidth of approximately 800 Hz (-3 dB).
Starting Page	198
Ending Page	201
File Size	455148
Page Count	4
File Format	PDF
ISBN	0780358295
DOI	10.1109/FUSION.1999.849819
Language	English
Publisher	Institute of Electrical and Electronics Engineers, Inc. (IEEE)
Publisher Date	1999-10-25
Publisher Place	USA
Access Restriction	Subscribed
Rights Holder	Institute of Electrical and Electronics Engineers, Inc. (IEEE)
Subject Keyword	Feedback control Control systems Tokamaks Coils Plasma measurements Inductors Delay Detectors High power amplifiers Power amplifiers
Content Type	Text
Resource Type	Article

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