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Task 4 HTS material characterization & dipole insert conceptual design

Task 4 HTS material characterization & dipole insert conceptual design. Mélanie Bruchon, Maria Durante, Thibault Lécrevisse, Jean-Marc Gheller, Olivier Louchart, Jean-Michel Rey CEA/IRFU/SACM. HTS characterization. Superpower AMSC. HTS characterization. Superpower (with insulation).

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Task 4 HTS material characterization & dipole insert conceptual design

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  1. Task 4HTS material characterization &dipole insert conceptual design Mélanie Bruchon, Maria Durante, Thibault Lécrevisse, Jean-Marc Gheller, Olivier Louchart, Jean-Michel Rey CEA/IRFU/SACM - J-M Rey - EUCARD Meeting - UNIGE 08/06/2010

  2. HTS characterization Superpower AMSC - J-M Rey - EUCARD Meeting - UNIGE 08/06/2010

  3. HTS characterization Superpower (with insulation) - J-M Rey - EUCARD Meeting - UNIGE 08/06/2010

  4. HTS characterization Superpower (without insulation) - J-M Rey - EUCARD Meeting - UNIGE 08/06/2010

  5. HTS characterization AMSC - J-M Rey - EUCARD Meeting - UNIGE 08/06/2010

  6. HTS characterization What next ? Cooling influence: what happens if we remove insulation? Quench propagation: next study using compact solenoids. MPZ and MQE determination versus temperature. - J-M Rey - EUCARD Meeting - UNIGE 08/06/2010 6

  7. Y Dipole design Bloc 1 Bloc 2 Bloc 3 X 20 mm beam tube 3 double pancakes 2 flat one 1 with bent end, each pancake symetrical / mid plane (only one tooling needed) External winding diameter: 98 mm - J-M Rey - EUCARD Meeting - UNIGE 08/06/2010

  8. Y Dipole design Bloc 1 Bloc 2 Bloc 3 X Inner bore diameter: 20 mm 254 A/mm² needed to reach 6T Peak field 6,1T Fx = 47,8 kdaN Fy = 78,5 kdaN No Nb3Sn contribution - J-M Rey - EUCARD Meeting - UNIGE 08/06/2010

  9. Y Dipole design Bloc 1 Bloc 2 Bloc 3 X Conductor extrapolation Using Superpower SCS 4050 @ 20 T and 10 K extrapolation: 520 A for a 4 mm wide. Assuming 2 12 mm wide ribbons and 60% efficiency on one of them the critical current may be 2496 A. Assuming 12 mm wide conductor of 0,4 mm thickness corresponding to 0,2 mm conductor + 0,1 mm tin + 0,1 mm kapton insulation the critical current density is 520 A/mm². - J-M Rey - EUCARD Meeting - UNIGE 08/06/2010 9

  10. Y Dipole design Bloc 1 Bloc 2 Bloc 3 X Conductor length needed With a straight length of 500 mm Block 1: 69 m Block 2: 105 m Block 3: 142 m Only block 3 needs « flare dance » end. Or 1260 m of 12 mm wide ribbons needed (or 202 k$) We may be able to discuss this number! - J-M Rey - EUCARD Meeting - UNIGE 08/06/2010 10

  11. Y Dipole design Bloc 1 Bloc 2 Bloc 3 X Junctions Main conductor: SC face to face Mid point and end connections: SC back to back - J-M Rey - EUCARD Meeting - UNIGE 08/06/2010 11

  12. Thank you for your attention - J-M Rey - EUCARD Meeting - UNIGE 08/06/2010 12

  13. - J-M Rey - EUCARD Meeting - UNIGE 08/06/2010

  14. - J-M Rey - EUCARD Meeting - UNIGE 08/06/2010

  15. Bloc 1 Bloc 2 Bloc 3 Bloc 4 X Which HTS will fit? Bi2212 YBCO - J-M Rey - EUCARD Meeting - UNIGE 08/06/2010

  16. Bloc 1 Bloc 2 Bloc 3 Bloc 4 X Bi 2212 Assume we can make a Rutherford cable using a round wire with 25% SC material Ic @ 4.2K & 20T = 82A Winding with 20% insulation No cabling degradation Good head treatment Je = 130 A/mm² We may expect B = 2.72T - J-M Rey - EUCARD Meeting - UNIGE 08/06/2010

  17. Bloc 1 Bloc 2 Bloc 3 Bloc 4 X YBCO Measured values Using AMSC 344 Cu (made for magnets) 4.55 x 0.22 = 1 mm² Ic @ 4.2K & 10T = 325A Ic @ 4.2K & 15T = 245A Extrapolation : Ic @ 4.2K & 20T = 165A Winding with 20% insulation No winding degradation Je = 130 A/mm² We may expect B = 2.72T - J-M Rey - EUCARD Meeting - UNIGE 08/06/2010 17

  18. Bloc 1 Bloc 2 Bloc 3 Bloc 4 X YBCO Measured value Using AMSC 344 S (with stainless steel, not made for magnets) 1.41 mm² Ic @ 4.2K & 15T = 580A Extrapolation : Ic @ 4.2K & 20T = 500A Winding with 20% insulation No winding degradation Je = 285 A/mm² We may expect B = 5.96T - J-M Rey - EUCARD Meeting - UNIGE 08/06/2010 18

  19. YBCO Using Super Power SCS 4050i (with kapton insulation) - J-M Rey - EUCARD Meeting - UNIGE 08/06/2010 19 19

  20. YBCO ribbon characterization Results (with 0.1 µV/cm criterion) : Je = 275 A/mm² @ 20K & 13T We may reach what we need ! (287 A/mm² @ 4.2K & 18T) Worrying concern: this tape blew up after 8 critical current measurement under 15T at 4.2K and 30K 16 mars 2010 - J-M Rey - EUCARD Meeting - UNIGE 08/06/2010 20

  21. YBCO ribbon characterization Test “as purchased” • Test after “damaging quench” 16 mars 2010 - J-M Rey - EUCARD Meeting - UNIGE 08/06/2010 21

  22. YBCO ribbon characterization • Some measurements problems :  To much heat power generated in the sample-current leads junctions : Uneasy to regulate the température.  The problem is corrected but we haven’t done the tests again yet. • It’s very difficult to limit the heat generation next to the sample when high current (> 500A) flows through the sample over long period of time (> 20s). A new measurement setup is needed for high current under low field 16 mars 2010 - J-M Rey - EUCARD Meeting - UNIGE 08/06/2010 22

  23. Bloc 1 Bloc 2 Bloc 3 Bloc 4 X A rough mechanical approach - Forces 50 tonnes 1040 tonnes - J-M Rey - EUCARD Meeting - UNIGE 08/06/2010

  24. Bloc 1 Bloc 2 Bloc 3 Bloc 4 X A rough mechanical approach - Stresses Stress 270 MPa 20 mm Interbloc Stress 9 MPa Mid plane Stress 17 MPa - J-M Rey - EUCARD Meeting - UNIGE 08/06/2010

  25. Bloc 1 Bloc 2 Bloc 3 Bloc 4 X StructureWhy should we keep the insert in a circular bore? - J-M Rey - EUCARD Meeting - UNIGE 08/06/2010 25

  26. Bloc 1 Bloc 2 Bloc 3 Bloc 4 X Winding How to use ribons for the mid plane pancake ? Can we assemble ribbons to increase Ic ? Can we mix Bi2212 and YBCO in the same insert ? - J-M Rey - EUCARD Meeting - UNIGE 08/06/2010 26

  27. Winding Winding developments can be inspired from the INNOVAC project (Danish Technical Institute/Danfysik/ Siemens) From an IOP presentation by Nikolaj Zangenberg, Danish Technological Institute - J-M Rey - EUCARD Meeting - UNIGE 08/06/2010

  28. Bloc 1 Bloc 2 Bloc 3 Bloc 4 X Protection Can we allow HTS to quench ? HTS material degradation often observed after quench Where could we have copper ? The need of high current density does not leave place for stabilizer - J-M Rey - EUCARD Meeting - UNIGE 08/06/2010 28

  29. It may be wise to add a contribution of the HTS fringe field on the Nb3Sn winding. A sub task with T3 and T4 people for the interface definition is strongly needed ! - J-M Rey - EUCARD Meeting - UNIGE 08/06/2010 29

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