NDLI: Secondary Thermohydraulic Quench Detection for the ITER Correction Coils

Content Provider	IEEE Xplore Digital Library
Author	Nicollet, S. Bessette, D. Ciazynski, D. Coatanea-Gouachet, M. Duchateau, J.L. Lacroix, B. Rodriguez-Mateos, F.
Copyright Year	2002
Abstract	The primary quench detection for ITER magnets is classically based on resistive voltage measurements. In addition, a safety related secondary quench detection relying on signals of thermohydraulic nature is required for the TF coils. Although not required by safety, a similar secondary quench detection system has been investigated for the other ITER coils [central solenoid (CS), poloidal field (PF), and correction coil (CC)]. The quenches in the ITER bottom correction coil (BCC3) of either the top pancake (P8) or the whole coil (eight pancakes), without a current fast discharge, are studied using the coupled Gandalf and Flower codes. The minimum quench energy is deposited in the area where the temperature margin is minimal, close to the outlet of the conductor. Because PF5, BCC3, and BCC6 are hydraulically linked in parallel, the influence of a PF5 coil quench without a fast discharge is studied. For all these cases, the cryogenic consequences are determined providing qualitative and quantitative information. Key signals are presented like pressure, temperature, and mass flows in the conductor itself, as well as at the ends of feeders, in the Cold Termination Box, where the sensors are located. The feasibility of the secondary thermohydraulic quench detection is investigated, leading to an associated proposal for the instrumentation (difference of mass flows: inlet-outlet). The main conclusions concerning these signals are discussed.
Sponsorship	Council on Superconductivity Appl. Superconductivity Conference Inc MIT
Starting Page	4201004
Ending Page	4201004
Page Count	1
File Size	941984
File Format	PDF
ISSN	10518223
Volume Number	23
Issue Number	3
Language	English
Publisher	Institute of Electrical and Electronics Engineers, Inc. (IEEE)
Publisher Date	2013-06-01
Publisher Place	U.S.A.
Access Restriction	One Nation One Subscription (ONOS)
Rights Holder	Institute of Electrical and Electronics Engineers, Inc. (IEEE)
Subject Keyword	Coils Discharges (electric) Conductors Valves Helium Temperature sensors Junctions thermohydraulics Cable-in-conduit conductor ITER CC system quench detection safety
Content Type	Text
Resource Type	Article
Subject	Condensed Matter Physics Electronic, Optical and Magnetic Materials Electrical and Electronic Engineering

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Thermal Behavior and Quench of the ITER TF System During a Fast Discharge and Possibility of a Secondary Quench Detection

Quasi 3D Thermo-Hydraulic Modeling and Conductor Temperatures of the ITER Correction Coils

Russia's Contribution to the ITER TF Magnets

Fabrication of an Insert to Measure Performance of ITER CS Conductor

DC Performance Results Versus Assessment of ITER Main Busbar NbTi Conductors

Helium Flow and Temperature Distribution in a Heated Dual-Channel CICC Sample for ITER

Qualification of the ITER Correction Coils and Their Conductor

Test results of the ITER PF insert conductor short sample in SULTAN

Manufacturing of ITER PF5 and CC Sample Conductors

Secondary Thermohydraulic Quench Detection for the ITER Correction Coils

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Thermal Behavior and Quench of the ITER TF System During a Fast Discharge and Possibility of a Secondary Quench Detection

Quasi 3D Thermo-Hydraulic Modeling and Conductor Temperatures of the ITER Correction Coils

Russia's Contribution to the ITER TF Magnets

Fabrication of an Insert to Measure Performance of ITER CS Conductor

DC Performance Results Versus Assessment of ITER Main Busbar NbTi Conductors

Helium Flow and Temperature Distribution in a Heated Dual-Channel CICC Sample for ITER

Qualification of the ITER Correction Coils and Their Conductor

Test results of the ITER PF insert conductor short sample in SULTAN

Manufacturing of ITER PF5 and CC Sample Conductors

Secondary Thermohydraulic Quench Detection for the ITER Correction Coils