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Title: Quench Detection and Instrumentation for the Tokamak Physics Experiment magnets

Abstract

The design of the Local Instrumentation & Control (I&C) System for the Tokamak Physics Experiment (TPX) superconducting PF & TF magnets is presented. The local I&C system monitors the status of the magnet systems and initiates the proper control sequences to protect the magnets from any foreseeable fault. Local I&C also stores magnet-system data for analysis and archiving. Quench Detection for the TPX magnets must use a minimum of two independent sensing methods and is allowed a detection time of one second. Proposed detection methods include the measurement of; (1) normal-zone resistive voltage, (2) cooling-path helium flow, (3) local temperature in the winding pack, (4) local pressure in the winding pack. Fiber-optic based isolation systems are used to remove high common-mode magnet voltages and eliminate ground loops. The data acquisition and fault-detection systems are computer based. The design of the local I&C system incorporates redundant, fault-tolerant, and/or fail-safe features at all component levels. As part of a quench detection R&D plan, a Quench Detection Model Coil has been proposed to test all detection methods. Initial cost estimates and schedule for the local I&C system are presented.

Authors:
;  [1];  [2]
  1. Lawrence Livermore National Lab., CA (United States)
  2. Massachusetts Inst. of Tech., Cambridge, MA (United States). Plasma Fusion Center
Publication Date:
Research Org.:
Lawrence Livermore National Lab., CA (United States); Massachusetts Inst. of Tech., Cambridge, MA (United States). Plasma Fusion Center
Sponsoring Org.:
USDOE, Washington, DC (United States)
OSTI Identifier:
10123141
Report Number(s):
UCRL-JC-114261; CONF-931018-79
ON: DE94006656; TRN: 94:003630
DOE Contract Number:  
W-7405-ENG-48; AC02-76CH03073
Resource Type:
Conference
Resource Relation:
Conference: Symposium on fusion engineering,Hyannis, MA (United States),11-15 Oct 1993; Other Information: PBD: 6 Oct 1993
Country of Publication:
United States
Language:
English
Subject:
70 PLASMA PHYSICS AND FUSION TECHNOLOGY; SUPERCONDUCTING MAGNETS; CONTROL SYSTEMS; QUENCHING; DESIGN; TOKAMAK DEVICES; DETECTION; SAFETY; DATA ACQUISITION SYSTEMS; 700430; MAGNET COILS AND FIELDS

Citation Formats

Chaplin, M R, Hassenzahl, W V, and Schultz, J H. Quench Detection and Instrumentation for the Tokamak Physics Experiment magnets. United States: N. p., 1993. Web.
Chaplin, M R, Hassenzahl, W V, & Schultz, J H. Quench Detection and Instrumentation for the Tokamak Physics Experiment magnets. United States.
Chaplin, M R, Hassenzahl, W V, and Schultz, J H. 1993. "Quench Detection and Instrumentation for the Tokamak Physics Experiment magnets". United States. https://www.osti.gov/servlets/purl/10123141.
@article{osti_10123141,
title = {Quench Detection and Instrumentation for the Tokamak Physics Experiment magnets},
author = {Chaplin, M R and Hassenzahl, W V and Schultz, J H},
abstractNote = {The design of the Local Instrumentation & Control (I&C) System for the Tokamak Physics Experiment (TPX) superconducting PF & TF magnets is presented. The local I&C system monitors the status of the magnet systems and initiates the proper control sequences to protect the magnets from any foreseeable fault. Local I&C also stores magnet-system data for analysis and archiving. Quench Detection for the TPX magnets must use a minimum of two independent sensing methods and is allowed a detection time of one second. Proposed detection methods include the measurement of; (1) normal-zone resistive voltage, (2) cooling-path helium flow, (3) local temperature in the winding pack, (4) local pressure in the winding pack. Fiber-optic based isolation systems are used to remove high common-mode magnet voltages and eliminate ground loops. The data acquisition and fault-detection systems are computer based. The design of the local I&C system incorporates redundant, fault-tolerant, and/or fail-safe features at all component levels. As part of a quench detection R&D plan, a Quench Detection Model Coil has been proposed to test all detection methods. Initial cost estimates and schedule for the local I&C system are presented.},
doi = {},
url = {https://www.osti.gov/biblio/10123141}, journal = {},
number = ,
volume = ,
place = {United States},
year = {Wed Oct 06 00:00:00 EDT 1993},
month = {Wed Oct 06 00:00:00 EDT 1993}
}

Conference:
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