BNL FNAL LBNL SLAC LARP Collaboration Meeting 13
BNL - FNAL - LBNL - SLAC LARP Collaboration Meeting 13 Nov. 4 -6, 2009 Port Jefferson Cable Test at CERN Giorgio Ambrosio Fermilab LARP CM 13 – Port Jefferson – Nov. 4 -6, 2009 G. Ambrosio – CERN Cable Test 1
Cable Sample Holder FRESCA collars Pre-load by bolts through the collars Voltage taps Report with sample holder description is on the plone LARP CM 13 – Port Jefferson – Nov. 4 -6, 2009 9 8 6 5 3 2 10 11 13 14 16 17 G. Ambrosio – CERN Cable Test 1 18 + lead (#1) - lead (#2) 2
FRESCA field parallel to self-field between cables LARP CM 13 – Port Jefferson – Nov. 4 -6, 2009 G. Ambrosio – CERN Cable Test 3
Cable self-field • COMSOL model: 0. 113 T/k. A • ANSYS model: 0. 107 T/k. A LARP CM 13 – Port Jefferson – Nov. 4 -6, 2009 G. Ambrosio – CERN Cable Test 4
LARP CM 13 – Port Jefferson – Nov. 4 -6, 2009 G. Ambrosio – CERN Cable Test 5
Coil #08 Cable Sample “ 4 -FRESCA-FNAL-RRP 54/61 -0909”: • Cables: 27 strands Keystoned – Strand diameter: 0. 7 +/- 0. 002 mm – Strand: Nb 3 Sn RRP 54/61 made by OST (billet: 9560) • • • width: (bare cable) 10. 077 +0. 000 -0. 100 mm mid thickness: (bare cable) 1. 26 +/- 0. 010 mm keystone angle: 1. 0 +/- 0. 01 deg. Sample length: 1725 mm (splices included) Cable spool: 983 R (used for LQ coil #08) LQ HT (cables reacted with LQ coil #08) Insulation: S 2 -sleeve (0. 1 mm thick) with palmitic acid Expected Ic: 16041 A @ 11. 41 T (9. 6 T FRESCA + 1. 81 T self-field) 4. 33 K Prestress: 40 MPa @ 300 K (3000 Kg per bolt) 0. 5 mm Kapton added after impregnation LARP CM 13 – Port Jefferson – Nov. 4 -6, 2009 G. Ambrosio – CERN Cable Test 6
Example of V-I ramp LARP CM 13 – Port Jefferson – Nov. 4 -6, 2009 G. Ambrosio – CERN Cable Test 7
Ramp Rate Study at 4. 3 K • small effect of Ramp Rate • ~small effect of waiting time LARP CM 13 – Port Jefferson – Nov. 4 -6, 2009 G. Ambrosio – CERN Cable Test 8
Max Quench Current Beginning of voltage rise Note: the Iq was lower every time the field was changed! LARP CM 13 – Port Jefferson – Nov. 4 -6, 2009 G. Ambrosio – CERN Cable Test 9
Strand – Cable Ic Comparison • Started comparison of strand cable Ic measurement with feedback to SSL computation – Include strand self-field; how much? Yes: 0. 483 T/k. A (Vadim: assuming current redistribution within each filament) – Take strain into account; how? Yes: Perform best fit of cable Ic data using parameterization (Arno’s model) based on extracted witness samples (BNL and FNAL data), and strain as fit parameter • -0. 085% additional thermal strain in cable test (SS sample holder) LARP CM 13 – Port Jefferson – Nov. 4 -6, 2009 G. Ambrosio – CERN Cable Test 10
Witness Sample Test Summary Arup Ghosh 11
SSL at 4. 33 K = 13880 A 13433 A assuming the same add. strain of the cable -3% per -0. 085% strain (sensitivity) LARP CM 13 – Port Jefferson – Nov. 4 -6, 2009 G. Ambrosio – CERN Cable Test 12
PS limit = 32 k. A LARP CM 13 – Port Jefferson – Nov. 4 -6, 2009 G. Ambrosio – CERN Cable Test 13
LARP CM 13 – Port Jefferson – Nov. 4 -6, 2009 G. Ambrosio – CERN Cable Test 14
LQ 08 V-I and V-H tests @ 4. 2 K Good match of stability threshold in 0 -9 T range Sample Is[A] range 0 -4 T Is[A] range 4 -8 T Is[A] range 8 -10 T Ic @15 T Ic @12 T 9560 Round Ti 1112. 5 ± 12. 5 1087. 5 ± 12. 5 837. 5 ± 12. 5 290 589 9560 extr. 983 Ti #1 837. 5 ± 12. 5 462. 5 ± 12. 5 412. 5 ± 12. 5 Iq 225 Iq 472 276 559 LARP CM 13 Port. Ti. Jefferson – Nov. 4 -6, 9560 extr. – 983 #2 10402009 ± 15 – CERN Cable Test 1012. 5 G. ± Ambrosio 12. 5 858 ± 15 Tc 0[K] 17. 197 Bc 20[T] 15 26. 286
Extracted Comparison @ 4. 2 K Sample Is[A] Range 0 -4 T Is[A] Range 4 -8 T Is[A] Range 8 -10 T Ic @ 12 T C Tc 0 Bc 2 LQ 06 9533 Extr 978 Ti 812 ± 12. 5 612. 5 ± 12. 5 562 10082 16. 239 27. 05 LQ 07 9532 Extr 979 R SS 912. 5 ± 12. 5 837. 5 ± 12. 5 787. 5 ± 12. 5 516 10149 16. 472 25. 873 LQ 08 9560 Extr 983 Ti 1040 ± 15 1012. 5 ± 12. 5 858 ± 15 564 10321 17. 198 26. 286 LQ 09 9534 -5 Extr 984 Ti 937. 5 ± 12. 5 1012. 5 ± 12. 5 862. 5 ± 12. 5 574 10166 17. 048 26. 677 LARP CM 13 – Port Jefferson – Nov. 4 -6, 2009 G. D. Ambrosio – CERN Cable Test Turrioni 16
Coil #06 BNL Witness Samples FNAL sample with Is = 563 A reached the critical surface at B ≥ 10 T variability? Other factors? LARP CM 13 – Port Jefferson – Nov. 4 -6, 2009 G. Ambrosio – CERN Cable Test BNL witness samples of coil #06 show Is ~ 950 A 17
Performance at 1. 9 K is better than at 4. 3 K; TQ 02 -series behaved differently Why? …strain, transv. pressure, more conductor, disturbance spectrum, … LARP CM 13 – Port Jefferson – Nov. 4 -6, 2009 G. Ambrosio – CERN Cable Test 18
Extracted Comparison @ 1. 9 K Strand stability at 1. 9 K is between cable and magnet Sample Is[A] range 0 -4 T Is[A] range 4 -8 T Is[A] range 8 -10 T Ic @15 T Ic @12 T LQ 06 9533 extr. 978 R Ti 887. 5 ± 12. 5 637. 5 ± 12. 5 562. 5 ± 12. 5 435 Iq 627 LQ 07 9532 Extr. 979 R SS 937. 5 ± 12. 5 687. 5 ± 12. 5 612. 5 ± 12. 5 378 Iq 682 LQ 09 9534 -5 Extr 984 Ti 1287. 5 ± 12. 5 525 ± 25 775 ± 25 431 760
Conclusions • The test at FRESCA of the LQ cable was very successful – Seen transition at B ≥ 9 T – Triggered an interesting comparison with strand tests • The comparison with TQ 02 -series models suggests that other factors may contribute to 1. 9 K stability – – – Disturbance spectrum? Strain (long. and/or due to transverse pressure)? Micro-cracks? Variability of long strand/cable lengths? … LARP CM 13 – Port Jefferson – Nov. 4 -6, 2009 G. Ambrosio – CERN Cable Test 20
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