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Title: Design, construction, and first operational results of a 5 megawatt feedback controlled amplifier system for disruption control on the Columbia University HBT-EP tokamak

Abstract

This paper presents the electrical design and first operational results of a 5 Megawatt feedback controlled amplifier system designed to drive a 300 uH saddle coil set on the HBT-EP tokamak. It will be used to develop various plasma feedback techniques to control and inhibit the onset of plasma disruptions that are observed in high {beta} plasmas. To provide a well characterized system, a high fidelity, high power closed loop amplifier system has been refurbished from the Los Alamos ZT-P equilibrium feedback system. In its configuration developed for the Columbia HBT-EP tokamak, any desired waveform may be generated within a 1,100 ampere and 16 kV peak to peak dynamic range. An energy storage capacitor bank presently limits the effective full power pulse width to 10 mS. The full power bandwidth driving the saddle coil st is {approximately}12 kHz, with bandwidth at reduced powers exceeding 30 kHz. The system is designed similar to a grounded cathode, push-pull, transformer coupled, tube type amplifier system. The detailed electrical design of the power amplifier, transformer, and feedback system will be provided in addition to recent HBT-EP operational results.

Authors:
; ; ;  [1]; ;  [2]
  1. Los Alamos National Lab., NM (United States)
  2. Columbia Univ., New York, NY (United States)
Publication Date:
OSTI Identifier:
505958
Report Number(s):
CONF-950905-
ISBN 0-7803-2970-8; TRN: 97:013651
Resource Type:
Conference
Resource Relation:
Conference: 16. IEEE/NPSS symposium on fusion engineering, Champaign, IL (United States), 1-5 Oct 1995; Other Information: PBD: 1995; Related Information: Is Part Of 1995 IEEE 16. symposium on fusion engineering. Volume 1; Miley, G.H.; Elliott, C. [eds.] [Univ. of Illinois, Urbana, IL (United States). Fusion Studies Lab.]; PB: 886 p.
Country of Publication:
United States
Language:
English
Subject:
70 PLASMA PHYSICS AND FUSION; COLUMBIA HIGH-BETA TOKAMAK; POWER AMPLIFIERS; DESIGN; CONSTRUCTION; OPERATION; FEEDBACK; PLASMA DISRUPTION; POWER SUPPLIES

Citation Formats

Reass, W A, Alvestad, H A, Bartsch, R R, Wurden, G A, Ivers, T H, and Nadle, D L. Design, construction, and first operational results of a 5 megawatt feedback controlled amplifier system for disruption control on the Columbia University HBT-EP tokamak. United States: N. p., 1995. Web.
Reass, W A, Alvestad, H A, Bartsch, R R, Wurden, G A, Ivers, T H, & Nadle, D L. Design, construction, and first operational results of a 5 megawatt feedback controlled amplifier system for disruption control on the Columbia University HBT-EP tokamak. United States.
Reass, W A, Alvestad, H A, Bartsch, R R, Wurden, G A, Ivers, T H, and Nadle, D L. Sun . "Design, construction, and first operational results of a 5 megawatt feedback controlled amplifier system for disruption control on the Columbia University HBT-EP tokamak". United States.
@article{osti_505958,
title = {Design, construction, and first operational results of a 5 megawatt feedback controlled amplifier system for disruption control on the Columbia University HBT-EP tokamak},
author = {Reass, W A and Alvestad, H A and Bartsch, R R and Wurden, G A and Ivers, T H and Nadle, D L},
abstractNote = {This paper presents the electrical design and first operational results of a 5 Megawatt feedback controlled amplifier system designed to drive a 300 uH saddle coil set on the HBT-EP tokamak. It will be used to develop various plasma feedback techniques to control and inhibit the onset of plasma disruptions that are observed in high {beta} plasmas. To provide a well characterized system, a high fidelity, high power closed loop amplifier system has been refurbished from the Los Alamos ZT-P equilibrium feedback system. In its configuration developed for the Columbia HBT-EP tokamak, any desired waveform may be generated within a 1,100 ampere and 16 kV peak to peak dynamic range. An energy storage capacitor bank presently limits the effective full power pulse width to 10 mS. The full power bandwidth driving the saddle coil st is {approximately}12 kHz, with bandwidth at reduced powers exceeding 30 kHz. The system is designed similar to a grounded cathode, push-pull, transformer coupled, tube type amplifier system. The detailed electrical design of the power amplifier, transformer, and feedback system will be provided in addition to recent HBT-EP operational results.},
doi = {},
journal = {},
number = ,
volume = ,
place = {United States},
year = {1995},
month = {12}
}

Conference:
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