HTS for Upgrades: overview of test requirements Amalia Ballarino, CERN Review of superconductors and magnet laboratories, A. Ballarino

Review of superconductors and magnet laboratories, A. Ballarino HTS for Upgrades: on-going projects  New Inner Triplets Cold Powering: HTS link for the powering of NIT magnets (IR1 and IR5, Q1+Q2+Q3, D1, CP)  FP7, Work Package 7, Task 5: HTS Superconducting Links Task coordinator: A. Ballarino (CERN) + SOTON (Univ. Southampton, UK) BHTS (Germany) Columbus (Italy) DESY (Germany)  FP7, Work Package 7, Task 4: HTS Insert Coils for High Field magnets Task coordinator: P. Tixador (CNRS, Grenoble)

Review of superconductors and magnet laboratories, A. Ballarino  Conductor qualification: Ic(T,B), joints, mechanical properties, quench performance,…  Cable qualification: Ic(Top,Bop), mechanical properties, quench performance,…  Link/coil –system- qualification: Iop(Top,Bop), electrical and thermal performance, quench protection,….

Review of superconductors and magnet laboratories, A. Ballarino HTS conductors ProjectConductorTemperature (K)Field (T)Current (kA) HTS link for NITMgB 2 ex-situ < 1 (s.f.)1-2 (strand) (cable) HTS link – FP7Bi-2212 Bi-2223 Y-123 MgB < 1 (s.f.)1 -2 (strand) (cable) HTS Coil – FP7Bi-2212 Y up to 20*1 (strand) 10 range (cable) * HTS coil: 7 T in a background field of 13 T HTS materials (BSCCO and YBCO) do not have isotropic properties

HTS link for NIT

MgB 2 wire Measured by Columbus

HTS link for NIT (ex. P5-R) Total length:  96 meters

Review of superconductors and magnet laboratories, A. Ballarino HTS link for NIT (ex. P5-R)

Review of superconductors and magnet laboratories, A. Ballarino Tests on HTS link for NIT Phase 1 ( ) : Test of strands, cables and sub-assemblies at 4.2 K (short samples -up to 1 m) Contact resistance (Cryolab, Block 4); Critical current (Block 4); Mechanical properties (Block 4); Quench characteristics. Test of strands and cables at intermediate temperatures (presently test facilities are not available at CERN) TOT = about 100 tests Phase 2 ( ): Test of prototype link about 20 m long (SM-18) Thermal and electrical characteristics; Quench protection Phase 3 (2013): Test of final link in String MgB 2 conductor

Review of superconductors and magnet laboratories, A. Ballarino 1×14 kA 1×2.5 kA 1×0.6 kA K He gas 5 K–3 bar He gas 6 × 14 kA 6 × 2.5 kA 8 × 0.6 kA L  20 m  =0.22 m Test of prototype HTS link for NIT Nb-Ti MgB 2 To cryo-recovery m(5 K)  0.5 g/s m(50 K-75 K)  1.5 g/s 4.5 K

HTS link for FP7

Review of superconductors and magnet laboratories, A. Ballarino Tests on HTS link for FP7 Phase 1 ( ) : Test of strands, cables and sub-assemblies at 4.2 – 77 K (short samples -up to 1 m length) Contact resistance; Critical current; Mechanical properties; Quench characteristics. TOT = about 100 tests Phase 2 (middle ): Test of complete link about 20 m long (SM-18) Current capabilities; Thermal and electrical characteristics; Quench protection. Use of test station of link for NIT – but different temperatures of He gas. MgB 2, BSCCO and YBCO conductors

Review of superconductors and magnet laboratories, A. Ballarino Tests on HTS insert coils for FP7 Phase 1 ( ): Test of strands and cables at 4.2 K and in external field (short samples -up to 1 m) Critical current; Contact resistance Specification: 7 T in a background field of 13 T TOT = about 50 tests Phase 2 (2014): Test of insert coil – not included in FP7 Bi-2212 and YBCO conductors

Tests on HTS stacks for HTS leads Bi-2223 conductor Test of HTS stacks at liquid nitrogen temperature for integration in HTS leads (spare leads or new requirements, i.e. construction of new components) Ic measurements as for series of stacks in LHC HTS current leads Review of superconductors and magnet laboratories, A. Ballarino Test station for LHC HTS current leads: besides the need for test of spares, we should have at CERN a test facility for testing HTS current leads of the LHC type (more than 3000 leads in the tunnel, of which about 1000 are HTS).