Electrical Tests of HTS Twisted-pair Cables With Helium Gas Cooling Task 5. High Tc superconducting link Partners CERN R&D of HTS twisted pair cables Bruker Energy & Supercon Technologies (BEST) R&D and Production of HTS Tapes Columbus Superconductors R&D and Production of HTS Tapes Institute of Cryogenics University of Southampton (SOTON) R&D of Cable operation and tests
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Electrical Tests of HTS Twisted-pair Cables With Helium Gas Cooling Task 5. High Tc superconducting link Partners CERN R&D of HTS twisted pair cables Bruker.
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Electrical Tests of HTS Twisted-pair Cables With Helium Gas Cooling
Task 5. High Tc superconducting link
Partners
CERNR&D of HTS twisted pair cables
Bruker Energy & Supercon Technologies (BEST)R&D and Production of HTS Tapes
Columbus Superconductors R&D and Production of HTS Tapes
Institute of Cryogenics University of Southampton (SOTON)R&D of Cable operation and tests
Conductor Specs and Cables in Liquid Cryogens
Conductors ManufacturerConductor IC (A), 77K
Cable IC
(A), 77KCable IC (A), 4.2K
Type-1 Bi-2223 Bruker HTS 85 260 1220
Type-2 Bi-2223 Sumitomo 180 490 2880
Type-3 YBCO SuperPower 90 290 4410
Type-4 YBCO AMSC 90 300 3220
Type-5 MgB2 Columbus 330 @30K 4260
Test Setup at SOTON
helium bi-flow
in
out
out
helium uni-flow in
out
2m long cryostat with two inner vessels for He gas flow;
Independent flow control for each vessel
Copper/HTS current leads up to 3000 A
Multiple channel instrumentation for voltages and temperatures
Interlocks for quench protection
Cooling Configurations and Critical Current Measurements
UNI-FLOW: Positive temperature gradient along the cable in the flow direction; Analogue to typical cable/bus-bar applications; Ic onset always at the warm end;
BI-FLOW: Improved temperature uniformity along the cable; Suitable for assessing cable homogeneity and intrinsic properties
such as V-I;
helium bi-flow
in
out
out
helium uni-flow in
out
Critical Current Measurements
IC DETERMINATION: Whole cable IC undefined in the presence of a temperature gradient
for uni-flow. DC measurement of slow current ramp not suitable for gas cooled
long length cables as heat transfer may be insufficient to maintain a stable isothermal condition in the vicinity of IC;
A semi-transient protocol using square current pulses (1-10 s) was
adopted;
STABILITY NEAR IC:
An important requirement for the cable application;
Current Tests in Uni-flow: An Example of Type-3 Cable at 50 K