EuCARD 2012 Collaboration Meeting Warsaw University of Technology 22 th April 2012 WP-7 / Task 4 Very high field magnet Introduction/objectives/partners Works done HTS conductors (Bi-2212 & YBCO coated) - characterization HTS solenoids HTS insert design and first implementations Conclusions & works to do

Warsaw University of Technology April 22, Objective, introduction Construction of an HTS dipole insert (6 T) within a Nb 3 Sn dipole magnet (13 T) Motivation: quest for higher fields Courtesy L. Rossi

Warsaw University of Technology April 22, Objective, introduction Three subtasks: zSpecification, characterization and quench modelling zDesign, construction and test of solenoid insert coils zDesign, construction and test of dipole insert coils Deliverable: zA HTS dipole insert coil constructed (D - M48) Milestones:  HTS conductor specifications for insert coils (R - M12) zTwo HTS solenoid insert coils (D - M24) Done

Warsaw University of Technology April 22, 2012 Partners 4 LASA Wroclaw University of Technology

Warsaw University of Technology April 22, Works done zHTS conductors (Bi-2212 & YBCO coated)  Comparison within the context (high J c &  ) yCharacterizations zTechnological implementation ySolenoid coils & connexions zProtection modelling and protection proposal zHTS insert design and first works yElectromagnetic and mechanical designs yConductor design and first realization ySome mechanical implementation

Warsaw University of Technology April 22, 2012 Characterizations 6 YBCO B lg YBCO B tr B lg B tr Courtesy J. Fleiter

Warsaw University of Technology April 22, 2012 J c parameterization 7 The most appropriate fit to describe critical surface of Bi-2212, Bi-2223, Y-123 and MgB 2 is the one based on flux creep theory: Where

Warsaw University of Technology April 22, 2012 Protection s Courtesy T. Lecrevisse 250 K 20 K 0.1s 0.20 s Pancake 30 series turns 365 MA/m 2 (Ø ≈ 100 mm) 0.3 J in 100 ms Courtesy A. Stenvall

Warsaw University of Technology April 22, 2012 Solenoids realized 9 Coil strongly instrumented (heaters, voltages tapes,Cernox ®, …)

Warsaw University of Technology April 22, Double pancake Double pancake without connexion between the two pancakes Cu mandrel (conduction cooling) Ø i = 75 mm Tape 4 mm SuperPower ® SCS 4050 tape Kapton ®

Warsaw University of Technology April 22, Solenoid test bench 20 T facility

Warsaw University of Technology April 22, Double pancake Test 4.2 K: 18 T 400 A (1000 MA/m 2 ) 700 MPa (JBR)

Warsaw University of Technology April 22, Layer coil Test 4.2 K: 16 T 400 A (1000 MA/m 2 ) 4 layers 10 serie turns per layer

Warsaw University of Technology April 22, CNRS double pancake sent to KIT

Warsaw University of Technology April 22, CNRS double pancake sent to KIT Results (4.2 K) 400 A up to 12 T 698 A at 10 T Wire broken (730 MPa) Same results / Grenoble

Warsaw University of Technology April 22, 2012 Instrumented double pancake 16  Heater inside one pancake  Numerous voltages taps

Warsaw University of Technology April 22, 2012 Multi pancake instrumented coil 17 Quench simulations

Warsaw University of Technology April 22, 2012 Insert electromagnetic design SC 12 mm tape (SP) Cu – 65 µm SC 12 mm tape (SP) Cu – 135 µm YBCO Soldered Contact

Warsaw University of Technology April 22, 2012 Insert mechanical design

Warsaw University of Technology April 22, Conclusions zAdvances in many fields for HTS inserts yCharacterizations and scaling laws yBetter understanding of the conductors and their implementation ySuccessful HTS coils with high performances yA lot of progress about quench modelling yConductor proposal

EuCARD 2012 Collaboration Meeting Warsaw University of Technology 22 th April 2012 Thank you for your kind attention