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
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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}
}
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}
}