CERN/CEA Collaboration agreement No. KE2275/TE WP5 – HTS insert Kick-off meeting 07/07/2014

WP5 Activities WP5 is the continuation of the EuCARD program High Field Magnet, WP7.4. The goal is the construction of an HTS dipole insert for FRESCA2 dipole background magnet aiming at a field increase of about 6 T. Three steps are foreseen: the realization and the test of a single layer prototype the realization of the insert the test of the insert alone and inside Fresca 2 dipole magnet 07/07/2014 CA No. KE2275/TE - WP5 - HTS Insert 2

B0 = 6 T Je= 250 A/mm2 Bpeak= 5, 87 T Inom = 2400 A Insert conductor is composed by three tapes HTS Insert 3 CA No. KE2275/TE - WP5 - HTS Insert 07/07/ double layers coils External tube, Nitronic parts, - Thermal shrinkage - TIG welding External pads, 316L 8/9 parts Electron-beam welded Iron poleCompression plates, 316L Contact Hastelloy + sc (65  m) 460  m Hastelloy + sc (65  m) Cuopper 70  m CuBe2 + polyester insulation (  m) 130 µm 200  m 12 mm (nominal) CuBe2 + polyester insulation (  m) 130  m Glass epoxy inter-coil and external insulation Electron-beam welding

HTS Insert – Critical points Critical points needing detailed studies or developments : Conductor critical current and stability margin dependence on magnetic field orientation External pads high precision machining External pads electron-beam welding Layer transition  Hard way bending in case of layer jump, high résistance in case of bridge jonctions CA No. KE2275/TE - WP5 - HTS Insert 07/07/2014 4

Single layer prototype tests 10 turns, 1 YBCO tape co-wounded with insulated CuBe 2 Tests at LNCMI Grenoble : Angular position : 0°, 5° 10° and 20° Current 700A, 1000A, 1200A, 1400A Magnetic field: 0T, 8T, 9,5T 07/07/2014 CA No. KE2275/TE - WP5 - HTS Insert 5 Magnetic Field

HTS Insert – External pads EDM machining of the pads at LNCMI Grenoble 07/07/2014 CA No. KE2275/TE - WP5 - HTS Insert 6 Machining procedure set-up tests and validation on 50 mm mock-up.

HTS Insert – External pads welding First electron beam welding tests have been validated Chemical analysis, microscopy and metallography at CERN Tensile tests at RT and 4K at Saclay 07/07/2014 CA No. KE2275/TE - WP5 - HTS Insert 7 Ultimate stress (MPa) Yield strenght (MPa) Maximal elongation (%) Young modulus (GPa) 300 K Welding // sample axis Welding ┴ sample axis No welding 602 ± ± ± ± ± ± 7 57 ± 5 51 ± 4 62 ± ± ± ± K Welding // sample axis Welding ┴ sample axis No welding Weld seam Beam stopper

HTS Insert - Winding 2 conductors will be wound in parallel 6 tapes wound together Conductor transposition pole to pole in the heads Layer transition, starting point of coil winding is under studying: Layer jump Bridge jonction Dummy stainless steel tapes will be used for winding machine design and winding process validation 8 CA No. KE2275/TE - WP5 - HTS Insert 07/07/2014

Tests of the insert First the insert will be tested alone with a limited current in order to check its superconducting properties Then the insert will be tested in the FRESCA 2 dipole magnet. The study of the coupling of the two magnets has to be completed The mechanical interface with FRESCA2 and the detailed test procedure must be defined 07/07/2014 CA No. KE2275/TE - WP5 - HTS Insert 9

Thanks for your attention

Milestones * depending of FRESCA2 schedule N°Description Actual collaboration agreement Today 5.1Test of the prototype at LNCMIFebruary 2014September 2013 Test of a second prototype at LNCMIMarch Construction of the insertMarch 2014June Test report of the insert inside FRESCA2July 2016September 2016* 07/07/2014 CA No. KE2275/TE - WP5 - HTS Insert