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

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

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• B0 = 6 T• Je= 250 A/mm2• Bpeak= 5, 87 T• Inom = 2400 A

• Insert conductor is composed by three tapes

HTS Insert

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3 double layers coilsExternal tube, Nitronic 40 - 8 parts,- Thermal shrinkage - TIG welding

External pads, 316L8/9 partsElectron-beam welded

Iron pole Compression plates, 316L

Contact

Contact

Hastelloy + sc (65 mm)

460 mm

Hastelloy + sc (65 mm)

Cuopper 70 mm

CuBe2 + polyester insulation (100 + 30 mm) 130 µm

200 mm

12 mm (nominal)

CuBe2 + polyester insulation (100 + 30 mm) 130 mm

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

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Single layer prototype tests• 10 turns, 1 YBCO tape co-wounded with insulated CuBe2

• Tests at LNCMI Grenoble :• Angular position : 0°, 5° 10° and 20°• Current 700A, 1000A, 1200A, 1400A• Magnetic field: 0T, 8T, 9,5T

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MagneticField

HTS Insert – External pads

• EDM machining of the pads at LNCMI Grenoble

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6Machining 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

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Ultimate stress (MPa)

Yield strenght (MPa)

Maximal elongation 

(%)

Young modulus (GPa)

 300 K 

Welding // sample axisWelding ┴ sample axis

No welding

602 ± 7610 ± 2604 ± 3

240 ± 3236 ± 1221 ± 7

57 ± 551 ± 462 ± 4

172 ± 10170 ± 6

177 ± 17

 4.2 K 

Welding // sample axisWelding ┴ sample axis

No welding

-

-

352388400

453846

184190197

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

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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

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Thanks for your attention

Milestones

* depending of FRESCA2 schedule

N°  DescriptionActual collaboration agreement

Today

5.1 Test of the prototype at LNCMI February 2014 September 2013

Test of a second prototype at LNCMI March 2015

5.2 Construction of the insert March 2014 June 2015

5.3 Test report of the insert inside FRESCA2 July 2016 September 2016*

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