Test of the FeaTHeR-M0 coils at high field and variable temperature - PowerPoint Presentation

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Test of the FeaTHeR-M0 coils at high field and variable temperature - PPT Presentation

in SULTAN X Sarasola August 11 t h 2020 Outline Test of the FeaTHeRM0 coils i n SULTAN X Sarasola 2 SULTAN test facility FeaTHeR M0 coils Required upgrades Test results Coil instrumentation and cryostat ID: 1027986

feather coils sarasola sultanx coils feather sultanx sarasola fm0 coil test generation results resistances dataconclusions coilquench measurementsheat measurementstcs cryostatjoint

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1. Test of the FeaTHeR-M0 coils at high field and variable temperature in SULTANX. SarasolaAugust 11th, 2020

2. OutlineTest of the FeaTHeR-M0 coils in SULTANX. Sarasola 2SULTAN test facilityFeaTHeR M0 coilsRequired upgradesTest results:Coil instrumentation and cryostatJoint resistances Ic measurementsTcs measurementsHeat generation in the coilQuench dataConclusions

3. OutlineTest of the FeaTHeR-M0 coils in SULTANX. Sarasola 3SULTAN test facilityFeaTHeR M0 coilsRequired upgradesTest results:Coil instrumentation and cryostatJoint resistances Ic measurementsTcs measurementsHeat generation in the coilQuench dataConclusions

4. SULTAN test facilityTest of the FeaTHeR-M0 coils in SULTANX. Sarasola 4Field generated by 3 pairs of concentric split solenoids:Bmax = 10.905 T in test wellHomogeneity (2%) along ~400 mm

5. SULTAN test facilityTest of the FeaTHeR-M0 coils in SULTANX. Sarasola 5Samples:Typically cable-in-conduit conductorsInserted through a vertical test well (144 mm × 94 mm rectangular pipe) Nb-Ti trafo supplies Isample ≤ 100 kATrafoTest well

6. OutlineTest of the FeaTHeR-M0 coils in SULTANX. Sarasola 6SULTAN test facilityFeaTHeR M0 coilsRequired upgradesTest results:Coil instrumentation and cryostatJoint resistances Ic measurementsTcs measurementsHeat generation in the coilQuench dataConclusions

7. FeaTHeR coilsTest of the FeaTHeR-M0 coils in SULTANX. Sarasola 7FeaTHeR-M0 and FeaTHeR-M2 are two sets of HTS insert-magnets produced at CERN and wound with REBCO-Roebel cableFeaTHeR-M0s are sub-scale planar racetrack coils (one single pancake)Tests in SULTAN:FM0.4: October 2017FM0.5: March 2019Coil # turnsTape supplier# tapestape width(mm)cable width(mm)FM0.43Bruker155.512FM0.54SuNAM155.512J. van Nugteren Ph.D. thesis, University of Twente (2016)

8. OutlineTest of the FeaTHeR-M0 coils in SULTANX. Sarasola 8SULTAN test facilityFeaTHeR M0 coilsRequired upgradesTest results:Coil instrumentation and cryostatJoint resistances Ic measurementsTcs measurementsHeat generation in the coilQuench dataConclusions

9. SULTAN test facilityTest of the FeaTHeR-M0 coils in SULTANX. Sarasola 9Samples:Typically cable-in-conduit conductorsInserted through a vertical test well (144 mm × 94 mm rectangular pipe) Nb-Ti trafo supplies Isample ≤ 100 kAThe test of FeaTHeR coils requires: Cryostat:Confine flow of He in a volume where temperature is regulated: 4.8 to 50 KHTS current adapter between HTS dipole and Nb-Ti trafoHeat exchanger:He must return to the cryo-plant as cold gas (T < 20 K)closed3 g/s at 4.8K1.4 g/s at 50K

10. Sample cryostatTest of the FeaTHeR-M0 coils in SULTANX. Sarasola 102880 mm-long cylindrical stainless steel chamber:OD = 88.9 mmID = 83.7 mmIt hangs from the SULTAN transformer2880 mmExternal dimensions:142 mm × 92 mmTransportation

11. HTS current adapterTest of the FeaTHeR-M0 coils in SULTANX. Sarasola 11Each leg made of:2 copper platesConnected by 2 parallel stacks of:8× REBCO tapes +9× brass stripesTransformer sideSample sideHTS tapessub-D-25 connectorsInstrumentation feedthroughsOperationalrange

12. HTS current adapterTest of the FeaTHeR-M0 coils in SULTANX. Sarasola 12Each leg made of:2 copper platesConnected by 2 parallel stacks of:8× REBCO tapes +9× brass stripesOperationalrange

13. Lead extensionsTest of the FeaTHeR-M0 coils in SULTANX. Sarasola 13The lead extensions of the FeaTHeR M0 coils have to be unsoldered and replaced by ~1.6-m-long leads for the test in the high field region.Each lead extension is made of 11×12-mm-wide tapes in a Cu profile.Ceramic sides facing each otherNon-facing ceramic sides

14. Mechanical considerationsTest of the FeaTHeR-M0 coils in SULTANX. Sarasola 14Cryostat (and coil) are hanging from the SULTAN transformer Efforts transmitted to the trafo:Fz = -2.5 kN (if centered) ✔Torque: 600 Nm ✘The net torque in the trafo cancels if the coil is rotated ~4ºStill, the coil+lead assembly experiences an internal torque

15. OutlineTest of the FeaTHeR-M0 coils in SULTANX. Sarasola 15SULTAN test facilityFeaTHeR M0 coilsRequired upgradesTest results:Coil instrumentation and cryostatJoint resistances Ic measurementsTcs measurementsHeat generation in the coilQuench dataConclusions

16. InstrumentationTest of the FeaTHeR-M0 coils in SULTANX. Sarasola 16Voltage taps:All consecutive voltage taps are pairedAdditionally, V6-V7(coil), V4-V9 (coil+extension) and L+-R- (overall V drop)Cernox temperature sensors:8 sensors in the coil (TC1-TC8) + 4 infrastructure sensors in cryostatTin/Tout in the cryostat, and Tin/Tout in the HEX are also monitoredFM0.5: All existing pickup coils are connected to the Data Acquisition System (DAS)

17. Cryostat commissioningTest of the FeaTHeR-M0 coils in SULTANX. Sarasola 17Operational temperature range: 4.8 - 50 K (uniform in the high field zone)Operational current: 20 kA @ 4.8 K – 9.5 kA @ 50 K

18. OutlineTest of the FeaTHeR-M0 coils in SULTANX. Sarasola 18SULTAN test facilityFeaTHeR M0 coilsRequired upgradesTest results:Coil instrumentation and cryostatJoint resistances Ic measurementsTcs measurementsHeat generation in the coilQuench dataConclusions

19. FM0.4: Joint resistancesTest of the FeaTHeR-M0 coils in SULTANX. Sarasola 19HTS adapter to lead extension (left)BSULTAN = 0 T

20. FM0.4: Joint resistancesTest of the FeaTHeR-M0 coils in SULTANX. Sarasola 20HTS adapter to lead extension (right)BSULTAN = 0 T

21. FM0.4: Joint resistancesTest of the FeaTHeR-M0 coils in SULTANX. Sarasola 21Lead extension to coil (left)BSULTAN = 0 T

22. FM0.4: Joint resistancesTest of the FeaTHeR-M0 coils in SULTANX. Sarasola 22Lead extension to coil (right): off-plane leadBSULTAN = 0 T

23. FM0.4: R across the coilTest of the FeaTHeR-M0 coils in SULTANX. Sarasola 23The largest contribution to Rtotal comes from the coilBSULTAN = 0 T

24. FM0.5: Joint resistancesTest of the FeaTHeR-M0 coils in SULTANX. Sarasola 24Similar results in FM0.5, but the lead-extension-to-coil resistances are more than one order of magnitude higherBSULTAN = 0 T

25. OutlineTest of the FeaTHeR-M0 coils in SULTANX. Sarasola 25SULTAN test facilityFeaTHeR M0 coilsRequired upgradesTest results:Coil instrumentation and cryostatJoint resistances Ic measurementsTcs measurementsHeat generation in the coilQuench dataConclusions

26. Ic measurementsTest of the FeaTHeR-M0 coils in SULTANX. Sarasola 26Current is ramped up in steps until the signal across the coil starts to take offThen, ramped downRamp rate: 50 A/s

27. FM0.5: Ic measurements (BSULTAN = 0 T)Test of the FeaTHeR-M0 coils in SULTANX. Sarasola 27BSULTAN = 0 T

28. FM0.5: Ic measurements (BSULTAN = 10.9 T)Test of the FeaTHeR-M0 coils in SULTANX. Sarasola 28BSULTAN = 10.9 T

29. FM0.5: Ic measurements (BSULTAN = 5 T)Test of the FeaTHeR-M0 coils in SULTANX. Sarasola 29BSULTAN = 5 T

30. FM0.5: Degradation after tests at high fieldTest of the FeaTHeR-M0 coils in SULTANX. Sarasola 30

31. FM0.4: Degradation after tests at high fieldTest of the FeaTHeR-M0 coils in SULTANX. Sarasola 311st day3rd day5th dayBSULTAN = 0 TSimilar results in FM0.4

32. OutlineTest of the FeaTHeR-M0 coils in SULTANX. Sarasola 32SULTAN test facilityFeaTHeR M0 coilsRequired upgradesTest results:Coil instrumentation and cryostatJoint resistances Ic measurementsTcs measurementsHeat generation in the coilQuench dataConclusions

33. Tcs measurements: experimental procedureTest of the FeaTHeR-M0 coils in SULTANX. Sarasola 33Current is fixed and the temperature in the cryostat is slowly increased until the V signal across the coil starts to take off~Tcs(Rcoil =250 nΩ)BSULTAN = 10.9 T, Isample = 1 kA

34. Tcs measurementsTest of the FeaTHeR-M0 coils in SULTANX. Sarasola 34Unfortunately, Tcs measurements were not possible (neither in FM0.4 nor in FM0.5) due to the large R across the coilBSULTAN = 10.9 T, Isample = 2.5 kA

35. OutlineTest of the FeaTHeR-M0 coils in SULTANX. Sarasola 35SULTAN test facilityFeaTHeR M0 coilsRequired upgradesTest results:Coil instrumentation and cryostatJoint resistances Ic measurementsTcs measurementsHeat generation in the coilQuench dataConclusions

36. Heat generation in the coilsTest of the FeaTHeR-M0 coils in SULTANX. Sarasola 36First run of FM0.5 in SULTAN (BSULTAN = 0 T)

37. Heat generation in the coilsTest of the FeaTHeR-M0 coils in SULTANX. Sarasola 37Temperature distribution after tests at high field

38. Heat generation in the coilsTest of the FeaTHeR-M0 coils in SULTANX. Sarasola 38The temperature in the coil sensors scales quite well with the square of the current

39. OutlineTest of the FeaTHeR-M0 coils in SULTANX. Sarasola 39SULTAN test facilityFeaTHeR M0 coilsRequired upgradesTest results:Coil instrumentation and cryostatJoint resistances Ic measurementsTcs measurementsHeat generation in the coilQuench dataConclusions

40. FM0.4: Quench during ramp-upTest of the FeaTHeR-M0 coils in SULTANX. Sarasola 40 BSULTAN = 10.9 T

41. FM0.4: Quench during ramp-upTest of the FeaTHeR-M0 coils in SULTANX. Sarasola 41 BSULTAN = 10.9 T

42. FM0.4: Quench during ramp-upTest of the FeaTHeR-M0 coils in SULTANX. Sarasola 42 BSULTAN = 10.9 T

43. FM0.5: Quench during an Ic runTest of the FeaTHeR-M0 coils in SULTANX. Sarasola 43

44. FM0.5: Quench during an Ic runTest of the FeaTHeR-M0 coils in SULTANX. Sarasola 44

45. FM0.5: Quench during an Ic runTest of the FeaTHeR-M0 coils in SULTANX. Sarasola 45

46. FM0.5: Quench during an Ic runTest of the FeaTHeR-M0 coils in SULTANX. Sarasola 46

47. FM0.5: Quench during an Ic runTest of the FeaTHeR-M0 coils in SULTANX. Sarasola 47

48. OutlineTest of the FeaTHeR-M0 coils in SULTANX. Sarasola 48SULTAN test facilityFeaTHeR M0 coilsRequired upgradesTest results:Coil instrumentation and cryostatJoint resistances Ic measurementsTcs measurementsHeat generation in the coilQuench dataConclusions

49. ConclusionsTest of the FeaTHeR-M0 coils in SULTANX. Sarasola 49SULTAN has been upgraded to test of accelerator-relevant samples:Cryostat inner diameter: 83.7 mmBackground field of 10.9 TVariable temperature: 4.8 - 50 K (uniform in the high field zone)Sample current: 20 kA @ 4.8 K – 9.5 kA @ 50 KTwo HTS demonstrator coils (FM0.4 and FM0.5) were among the first accelerator samples tested at variable temperature and high magnetic field in SULTAN.Both tests were limited by the apparent resistance across the coil, which increased dramatically after the tests at high field.Coil-to-lead resistance was also a few hundred nΩ in the coil FM0.5:Preliminary inspection suggested that the orientation of the ceramic side of the tapes might not be always on the same side of the Roebel.Heat generation is observed inside both coils since the very first runs.