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Numerical study of a 50 kA superconducting bus for the NET/ITER model coil test in TOSKA-upgrade

Technical Report:

Abstract

Based on the design of the supreconducting bus bar system for the 1.8 K test of the EURATOM LCT coil in the TOSKA Upgrade facility, a superconducting bus bar was designed for the NET/ITER model coil test for an operating current of 50 kA made out of a NbTi cable-in-conduit-conductor imbedded in a copper profile for electrical and mechanical stabilization. For safety reasons, the mass flow through the bus bar is designed as a separate circuit, i.e. the mass flow rates of the coil pancakes, the bus bar, and the current lead are independently adjustable. This results in a bus bar which is safe in case of loss of cooling. But the eddy current losses generated in the stabilizing cooper during the fast discharge of the model coils are by far too high, i.e. the bus bar will quench during high magnetic field changes. Therefore, alternatives are discussed in which the design principles of the bus bar were not changed but it was tried to reduce the eddy current losses in the copper stabilizer. The only possible alternative as a superconducting bus bar consisting of a cable-in-conduit(-CIC)-conductor without any stabilizing copper profile around it. The CIC is imbedded in a  More>>
Authors:
Publication Date:
Mar 01, 1992
Product Type:
Technical Report
Report Number:
KFK-5008
Reference Number:
SCA: 665412; 700430; PA: DEN-92:013310; SN: 93000903119
Resource Relation:
Other Information: PBD: Mar 1992
Subject:
75 CONDENSED MATTER PHYSICS, SUPERCONDUCTIVITY AND SUPERFLUIDITY; 70 PLASMA PHYSICS AND FUSION TECHNOLOGY; SUPERCONDUCTING CABLES; NUMERICAL ANALYSIS; COPPER; NIOBIUM ALLOYS; TITANIUM ALLOYS; SUPERCONDUCTING WIRES; FILAMENTS; COATINGS; MAGNETIC FIELDS; TEMPERATURE DISTRIBUTION; ELECTRIC CONDUCTIVITY; TEMPERATURE DEPENDENCE; TEMPERATURE RANGE 0000-0013 K; TEMPERATURE RANGE 0013-0065 K; TEMPERATURE RANGE 0065-0273 K; DESIGN; ENERGY LOSSES; EDDY CURRENTS; STEADY-STATE CONDITIONS; TRANSIENTS; 665412; 700430; SUPERCONDUCTING DEVICES; MAGNET COILS AND FIELDS
OSTI ID:
10104030
Research Organizations:
Kernforschungszentrum Karlsruhe GmbH (Germany). Inst. fuer Technische Physik; Kernforschungszentrum Karlsruhe GmbH (Germany). Projekt Kernfusion
Country of Origin:
Germany
Language:
English
Other Identifying Numbers:
Other: ON: DE93742165; TRN: DE9213310
Availability:
OSTI; NTIS (US Sales Only); INIS
Submitting Site:
DEN
Size:
62 p.
Announcement Date:
Jun 30, 2005

Technical Report:

Citation Formats

Heller, R. Numerical study of a 50 kA superconducting bus for the NET/ITER model coil test in TOSKA-upgrade. Germany: N. p., 1992. Web.
Heller, R. Numerical study of a 50 kA superconducting bus for the NET/ITER model coil test in TOSKA-upgrade. Germany.
Heller, R. 1992. "Numerical study of a 50 kA superconducting bus for the NET/ITER model coil test in TOSKA-upgrade." Germany.
@misc{etde_10104030,
title = {Numerical study of a 50 kA superconducting bus for the NET/ITER model coil test in TOSKA-upgrade}
author = {Heller, R}
abstractNote = {Based on the design of the supreconducting bus bar system for the 1.8 K test of the EURATOM LCT coil in the TOSKA Upgrade facility, a superconducting bus bar was designed for the NET/ITER model coil test for an operating current of 50 kA made out of a NbTi cable-in-conduit-conductor imbedded in a copper profile for electrical and mechanical stabilization. For safety reasons, the mass flow through the bus bar is designed as a separate circuit, i.e. the mass flow rates of the coil pancakes, the bus bar, and the current lead are independently adjustable. This results in a bus bar which is safe in case of loss of cooling. But the eddy current losses generated in the stabilizing cooper during the fast discharge of the model coils are by far too high, i.e. the bus bar will quench during high magnetic field changes. Therefore, alternatives are discussed in which the design principles of the bus bar were not changed but it was tried to reduce the eddy current losses in the copper stabilizer. The only possible alternative as a superconducting bus bar consisting of a cable-in-conduit(-CIC)-conductor without any stabilizing copper profile around it. The CIC is imbedded in a jacket made of stainless steel for mechanical stability. The calculations show that this type of bus bar has a high safety margin with respect to AC-losses. In this report, the different designs are described, and the computational results are presented. (orig./GSCH).}
place = {Germany}
year = {1992}
month = {Mar}
}