Eu CARD WP7 Collaboration Meeting INFN LASA Milano

Eu. CARD WP-7 Collaboration Meeting INFN / LASA – Milano 18 th September 2012 WP-7 / Task 4 Very high field magnet Pascal Tixador (Grenoble INP / Néel-G 2 Elab) For all the contributors to this task

Objective, introduction Three subtasks: z Specification, characterization and quench modelling z Design, construction and test of solenoid insert coils z Design, construction and test of dipole insert coils Milestones: z HTS conductor specifications for insert coils (R - M 12) z Two HTS solenoid insert coils (D - M 24) Deliverable: z A HTS dipole insert coil constructed (D – M 48) z Delay but insert pancake test under 10 T (M 48) 2 LASA lab. Milano September 18, 2012 Done

Outline z Numerical tool for HTS coils / protection z HTS Solenoids y Technological implementation y Experiment for validation of simulation tool z Conductor for HTS insert z Work to do + • • Insert design and construction Protection Mélanie Devaux Protection working group tomorrow 3 LASA lab. Milano September 18, 2012

Numerical tools Works by Tampere, LASA (see protection) and CEA. Very important to have a tool to design and to optimise the magnet and its conductor. Works carried out by CEA (T. Lecrevisse Ph. D) using CASTEM where the « CNRS » model (power law for SC and shunt in //) was implemented. r(T, i) 4 LASA lab. Milano September 18, 2012

Simulation tool: quench develpment Pancake 30 series turns 365 MA/m 2 (Ø ≈ 100 mm) 0. 3 J in 100 ms 20 K 0. 1 s 250 K 0. 20 s 0. 5 s Courtesy T. Lecrevisse 5 LASA lab. Milano September 18, 2012

Simulation tool: optimization example Shunt (e) SC tape (95 µm) Same Je (340 MA/m 2) 130 A (0 µm) < I < 600 A (350 µm) Ic = 880 A Competition between: • I/Ic • Propagation velocity • Enthalpic stabilization Courtesy T. Lecrevisse 6 MQE max (40 m. J) for 100/150 µm LASA lab. Milano September 18, 2012

Eu. CARD WP-7 Collaboration Meeting INFN / LASA – Milano 18 th September 2012 WP-7 / Task 4 Very high field magnet x HTS Solenoids • Technological implementation • Experiment for validation of simulation tool

Solenoid test bench 20 T facility 18 T (120 mm) 8 LASA lab. Milano September 18, 2012

Solenoids realized Coil strongly instrumented (heaters, voltages tapes, Cernox®, …) 9 LASA lab. Milano September 18, 2012

Double pancake Test 4. 2 K: • 18 T • 400 A (1000 MA/m 2) • 700 MPa (JBR) KIT© Results (4. 2 K) • 400 A up to 12 T • 698 A under 10 T • Failure (730 MPa) LASA lab. Milano September 18, 2012

Layer coil • 4 layers • 10 serie turns per layer Test 4. 2 K: • 16 T • 400 A (1000 MA/m 2) 11 LASA lab. Milano September 18, 2012

Double pancake with connexions/cycling 124 tests • 250 < J < 550 (MA/m 2) • 10 < B < 17 (T) • 100 < s < 374 (MPa) Destruction 950 MA/m 2, 17 T, 646 MPa 12 LASA lab. Milano September 18, 2012

Multi pancake instrumented coil Quench simulations 13 LASA lab. Milano September 18, 2012

Instrumented double pancake § § 14 Heater inside one pancake Numerous voltages taps LASA lab. Milano September 18, 2012

Double pancake MARS ONE (V 3) • Heater • Numerous voltage taps 15 LASA lab. Milano September 18, 2012

MARS ONE (V 3) typical curve 16 LASA lab. Milano September 18, 2012

MARS ONE (V 3) typical curve 17 LASA lab. Milano September 18, 2012

MARS ONE (V 3) - simulation • Under progress Courtesy T. Lecrevisse 18 LASA lab. Milano September 18, 2012

MARS ONE (V 4) to be tested 19 LASA lab. Milano September 18, 2012

Eu. CARD WP-7 Collaboration Meeting INFN / LASA – Milano 18 th September 2012 WP-7 / Task 4 Very high field magnet • HTS insert conductor (protection)

Insert YBCO conductor Coil Length (mm) Conductor length (m) 1 / 6 2 / 5 3 / 4 350 700 2 x 25 2 x 45 2 x 110 LASA lab. Milano September 18, 2012

Insert YBCO conductor Cu – 135 µm So ld er ed SC 12 mm tape (SP) Cu – 65 µm SC 12 mm tape (SP) Cu – 135 µm Contact YBCO Contact Connexions within pancake § Stabilization § Easy connexions § within and between pancake § YBCO close to neutral axis § AC losses Cu Cu Connexions between pancake LASA lab. Milano September 18, 2012

Eu. CARD insert YBCO conductor CNRS© CERN© CNRS© Possible degradation due to preparation 23 LASA lab. Milano September 18, 2012

Eu. CARD insert YBCO conductor Asked CERN to purchase the conductor mid june, arrives at CERN mid september … Courtesy J. Fleiter 24 LASA lab. Milano September 18, 2012

Mechanical issue Cu 400 µm Superconductor + Cu 100 µm SC tape 50 µm Hast 65 µm Cu 70 µm SC tape 50 µm Hast 65 µm Cu 100 µm σ = 300 MPa Conductor does not withstand the stresses in the insert (400 MPa) LASA lab. Milano September 18, 2012

Shunt material: Cu. Be • Good mechanical properties : stress to withstand (>>> Cu) • Rather good electrical conductivity: protection (>>> Hastelloy) LASA lab. Milano September 18, 2012

Resistivity measurement T (K) 77 300 Before heat treatment 6. 94 8. 73 After thermal treatment 5. 4 6. 84 Cu. Be 2 resistivity (10 -8 Ωm) LASA lab. Milano September 18, 2012

Mechanical Properties Mechanical properties close to Hastelloy (1200 MPa) CEA will make some measurements LASA lab. Milano September 18, 2012

Possible conductors Cu. Be 400 µm 100 µm SC tape 50 µm Hast 65 µm Cu 70 µm SC tape 50 µm Hast 65 µm Cu. Be 100 µm Cu. Be 2 35 µm Cu 65 µm SC tape 50 µm Hast 400 µm 65 µm Cu 70 µm SC tape 50 µm Hast 65 µm Cu. Be 2 35µm LASA lab. Milano September 18, 2012

Protection – hot spot temperature s (MPa) (MA 2/m 4 s) Cu shunt Hastelloy shunt Cu. Be shunt Cu/Cu. Be shunt 300 900 50 730 13 580 18 570 30 100 LASA lab. Milano September 18, 2012

Conductor – current distribution Cu. Be SC Cu. Be LASA lab. Milano September 18, 2012

Protection: working group tomorrow Works by TUT, LASA & CEA 32 LASA lab. Milano September 18, 2012

Eu. CARD WP-7 Collaboration Meeting INFN / LASA – Milano 18 th September 2012 WP-7 / Task 4 Very high field magnet y HTS pancake preliminary test

Preliminary tests for Eu. CARD pancake Use of the LNCMI large bore 10 T magnet (M 10) 34 LASA lab. Milano September 18, 2012

Preliminary tests for Eu. CARD pancake 35 LASA lab. Milano September 18, 2012

Preliminary tests for Eu. CARD pancake Huge forces B (0 -10 T) 36 LASA lab. Milano September 18, 2012

Conclusions z Advances in many fields for HTS inserts y Better understanding of the conductors and their implementation y A lot of progress about simulation tools and quench modelling y Successful HTS solenoids with high performances y HTS insert fully designed y Conductor proposal with preliminary tests 37 LASA lab. Milano September 18, 2012

Works to be done z Complete tests of the YBCO conductor z At 4. 2 K in Fresca (CERN) z Design and manufacturing of the support for the pancake test under 10 T (end of 2012) z Conductor ordering (Super. Power & CERN) z Pancake windings (CEA) z Pancake tests under 10 T (March 2013) z Insert manufacturing and final tests in Fresca II 38 LASA lab. Milano September 18, 2012

Eu. CARD WP-7 Collaboration Meeting INFN / LASA – Milano 18 th September 2012 Thank you for your kind attention and many thank to all the people who have participated to these works