1282014 HTS cables RACC TSTC CORC transposition complete partial partial J e high medium low tape consumption high low medium Three main options of tape alignment Roebel bars ID: 1022505
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1. Overview: HTS4Fusion Workshop1/28/2014
2. HTS cablesRACCTSTCCORCtranspositioncompletepartialpartialJehighmediumlowtape consumptionhighlowmediumThree main options of tape alignmentRoebel bars RACC cableTwisted stacks of tapes TSTCHelical CORC cableHTS cable concepts for fusion magnets2
3. HTS cables: topicsBendingMechanical propertiesJoints & contactsAutomatic manufacturingPerformance at high fieldsScaling to high currentsAC lossesHTS cable concepts for fusion magnets3
4. HTS cable concepts for fusion magnets4Roebel Assembled Coated Conductor (RACC) cable
5. RACC: perpendicular pressureHTS cable concepts for fusion magnets5Applying pressure on RACC cables6.7 kN 14 – 43 MPa (contact surface undef.)10 % reversible Ic reductionBayer et al. (KIT)
6. RACC: striationsImproving effect of striationsCu deposition after laser cutcouples filamentshigher AC losses (open symbols)HTS cable concepts for fusion magnets6Heat treatment in O2decouples filamentsreduces AC losses (closed symbols)Goldacker et al. (KIT)
7. RACC: round RutherfordConstruction & test of fully equipped 1.4 m model cable6 Roebel strands, 10 tapes each (4 mm wide, from IRL)77 K self-field:Ic: 2.5 kAJc,e: 1.1 kA/cm-2inhomogeneousdistributiondelamination HTS cable concepts for fusion magnets7Goldacker et al. (KIT)
8. HTS cable concepts for fusion magnets8Twisted Stacked-Tape Cable (TSTC)
9. TSTC: Ic(B, T)Ic at high perp. field and low temp.HTS cable concepts for fusion magnets9better than expectations:> average Ic of tape * number of tapes * lift factorUglietti et al. (CRPP)
10. TSTC: bendingIsotropic bendingEasy bending (out of plane): limit: 0.55% strain Hard bending (in plane): limit: 0.25% strain 1.6 m Ø delaminationHTS cable concepts for fusion magnets10Uglietti et al. (CRPP)
11. TSTC: transverse pressureHTS cable concepts for fusion magnets11Uglietti et al. (CRPP)Ic vs transverse pressureIsotropicLimit in worst case (90 °): 30 MPaLower layer of flat cable (15 T, 3 kA per strand): 15 MPa
12. TSTC: jointsFabrication and test of different types of jointsHTS cable concepts for fusion magnets12Uglietti et al. (CRPP)
13. TSTC: twist windingsBEFORE: bending of TSTCHard bending side: 140 mm Ø: 3.6 % irr. degradationNEW: Stacked-Tape Twist-WindingCable follows shape of the curve always easy bending side HTS cable concepts for fusion magnets13Takayasu et al. (MIT)
14. TSTC: H-channelScale-up fabrication of 2 channel TSTC (H-channel)H-channel reduces self-field effectAutomated production: 4-axis3D milling machineHTS cable concepts for fusion magnets14Takayasu et al. (MIT)
15. TSTC: slotted 5 core CICCDesign of slotted core CICC HTS cable concepts for fusion magnets15Celentano et al. (ENEA)
16. TSTC: slotted 5 core CICCAutomated manufacturingHTS cable concepts for fusion magnets16Celentano et al. (ENEA)
17. HTS cable concepts for fusion magnets17Conductor on Round Core (CORC) cable
18. CORC: automated windingBEFORE: hand windingirregular tape spacingvoids in winding packtapes damaged during bending(60 mm Ø: 56 % irr. degradation)NEW: automated winding machinecontrolled tape separation,winding angle & tensionHTS cable concepts for fusion magnets18Van der Laan et al. (UC & ACT)
19. CORC: bendingImproved cable flexibilitybending to low diameters possible:40 mm Ø: 2.5 % rev. degradationHTS cable concepts for fusion magnets19Van der Laan et al. (UC & ACT)
20. CORC: terminals & jointsBEFORE: conical or solder filled terminalsSolder filled: high resistivity, smallConical: Low resistivity, very bigNEW: hybrid type jointsLow resistivity, smallDemountableHTS cable concepts for fusion magnets2036 nΩ225 nΩ50-60 nΩ each170 nΩ totalVan der Laan et al. (UC & ACT)
21. HTS cable concepts for fusion magnets21REBCO tapepicture: Fujikura
22. YBCO tapes: 2014 Amperium50 % increased Ic @ same priceNEW 2014 products: 4.4 mm wide: >180 A, 12 mm wide: >350 AHTS cable concepts for fusion magnets22Rouse (AMSC)
23. YBCO tapes: peeling resistanceHTS cable concepts for fusion magnets23Ideal for epoxy impregnated coilsRouse (AMSC)
24. HTS cable concepts for fusion magnets24