HTS for Upgrades:overview of test requirements

Amalia Ballarino, CERN

Review of superconductors and magnet laboratories, 19-05-09 A. Ballarino

Review of superconductors and magnet laboratories, 19-05-09 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 magnetsTask coordinator: P. Tixador (CNRS, Grenoble)

Review of superconductors and magnet laboratories, 19-05-09 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, 19-05-09 A. Ballarino

HTS conductors

Project Conductor Temperature (K) Field (T) Current (kA)

HTS link for NIT MgB2 ex-situ 4.5 -25 < 1 (s.f.) 1-2 (strand)

0.6-2.5-14(cable)

HTS link – FP7 Bi-2212Bi-2223Y-123MgB2

4.5 - 77 < 1 (s.f.) 1 -2(strand)

0.6-14(cable)

HTS Coil – FP7 Bi-2212Y-123

4.5 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

D1 Q3 Q2 Q1 Q1

Protection, energy extraction and power conversion

Link (5 to 15 K)

Nb-Ti to MgB2 joints (5 K)

Leads (20 to 300 K) & boxMgB2 to Cu joints (15 K),

Magnets

Busbars in cryostats

Cold power transfer system

HTS link for NIT

MgB2 wire

Measured by Columbus

HTS link for NIT (ex. P5-R)

Total length: 96 meters

Review of superconductors and magnet laboratories, 19-05-09 A. Ballarino

HTS link for NIT (ex. P5-R)

Review of superconductors and magnet laboratories, 19-05-09 A. Ballarino

Tests on HTS link for NIT

Phase 1 (2009-2010) : 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 (2009-2011): 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

MgB2 conductor

1×14 kA

1×2.5 kA

1×0.6 kA

50-70 K He gas

5 K–3 bar He gas

6 × 14 kA6 × 2.5 kA8 × 0.6 kA

L20 m

=0.22 m

Test of prototype HTS link for NIT Nb-Ti

MgB2

To cryo-recovery

m(5 K) 0.5 g/sm(50 K-75 K) 1.5 g/s

4.5 K

HTS link for FP7

Review of superconductors and magnet laboratories, 19-05-09 A. Ballarino

Tests on HTS link for FP7

Phase 1 (2010-2013) : 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 2013 - 2014): 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.

MgB2, BSCCO and YBCO conductors

Review of superconductors and magnet laboratories, 19-05-09 A. Ballarino

Tests on HTS insert coils for FP7

Phase 1 (2010-2013): 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 leadsBi-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, 19-05-09 A. Ballarino

Test station for LHC HTS current leads: besides the need for test of spares, we shouldhave 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).