SQXF Cu Cable Winding Test at LBNL Dan Cheng Dec 17, 2013

SQXF Winding Test Uses the HQ winding mandrel as a baseline – FNAL-supplied mandrel spacer (120 mm -> 150 mm) eliminated need for significant tooling fabrication Parts rapid-prototyped in-house with Accura 60 – BEND design – Pole islands, wedges, spacers, end shoes Dec 17, 2013 D. Cheng2

HQ Winding Tooling Modifications Dec 17, 2013 D. Cheng3 FNAL supplied spacer to fill space from 120mm to 150mm dia modified for mounting to HQ mandrel

Winding Objectives Compare between copper and real cable – Winding behavior (parts shapes) – “Fluffiness” of coil in azimuthal direction Data gathering – Record mandrel rotation per turns – Observe effects of winding tension Dec 17, 2013 D. Cheng4

Winding Parameters Dec 17, 2013 D. Cheng5 CERN Cable HQ16UC0121D – mm average thickness – mm width – 0.59° keystone angle – Cable insulation Directly braided S2 Glass, 66 TEX, 636-sized ~ µm, but LBNL 10-stack measurements pending to confirm thickness Winding tool used on all turns Initial 5 turns wound at low tension (~11-13 kg) Remaining turns – RE wound at low tension (11-13 kg) – LE wound at nominal tension (25-27 kg)

First Five Turns, LE, ~11 kg Tension Nb 3 SnCopper Dec 17, 2013 D. Cheng6

First Five Turns, RE, ~12 kg Tension Nb 3 SnCopper Dec 17, 2013 D. Cheng7

Turn 6, LE Nb 3 Sn, ~12 kg Tension Copper (wrapped spacers), ~27 kg Tension Dec 17, 2013 D. Cheng8

Turn 6, RE, ~12 kg Tension Nb 3 SnCopper (wrapped spacers) Dec 17, 2013 D. Cheng9

2nd Spacer (T12), LE Nb 3 Sn, ~12 kg TensionCopper, ~25 kg Tension Dec 17, 2013 D. Cheng10

2nd Spacer (T12), RE, 12 kg Tension Nb 3 SnCopper Dec 17, 2013 D. Cheng11

2nd Spacer (T13/14), LE Nb 3 Sn, ~12 kg Tension ~72° angle Copper, ~25 kg Tension ~68° angle Dec 17, 2013 D. Cheng12

2nd Spacer (T13/14), RE, 12 kg Tension Nb 3 Sn ~72° angle Copper ~74° angle Dec 17, 2013 D. Cheng13

End shoe (T22), LE Nb 3 Sn, ~12 kg TensionCopper, ~25 kg Tension Dec 17, 2013 D. Cheng14

End Shoe(T22), RE, 12 kg Tension Nb 3 SnCopper Dec 17, 2013 D. Cheng15

Final angle, after azim. compression ~67° Copper, LE~68° Copper, RE Dec 17, 2013 D. Cheng16

Summary of Turns 6-13 TurnTension kg Mandrel Ang. Notes Turn 6, LE25.48°*Wrapped spacer Turn 7, LE26.88°*Wrapped spacer 2 Turn 8, LE26.814° Turn 9, LE27.615° Turn 10, LE28.610° Turn 11, LE26.812° Turn 12, LE13.2*8°Wrong tension Turn 13, LE29.517°Spacer inserted; moved when winding Dec 17, 2013 D. Cheng17 TurnTension kg Mandrel Ang. Notes Turn 6, RE13.69°*Wrapped spacer Turn 7, RE12.718° Turn 8, RE13.618° Turn 9, RE10.412° Turn 10, RE12.76° Turn 11, RE13.610° Turn 12, RE13.614° Turn 13, RE12.79°Spacer inserted, did not move Lead End, ~25 kgReturn End, ~12 kg

Summary of Turns Dec 17, 2013 D. Cheng18 TurnTension, kgMandrel Ang.Cable Ang. From horiz. Turn 14, LE25.912°67° Turn 15, LE26.38°69° Turn 16, LE26.313°71° Turn 17, LE24.912°70° Turn 18, LE25.411°70° Turn 19, LE2410°69° Turn 20, LE26.816°68° Turn 21, LE25.914°68° Turn 22, LE26.818°68° TurnTension, kgMandrel Ang.Cable Ang. From horiz. Turn 14, RE12.79°73° Turn 15, RE11.713°73° Turn 16, RE12.79°73° Turn 17, RE12.710°75° Turn 18, RE12.710°78° Turn 19, RE13.210°72° Turn 20, RE11.711°69° Turn 21, RE12.714°68° Turn 22, RE12.710°68° Lead End, ~25 kgReturn End, ~12 kg

Copper Cable Observations No popped strands – Same with the Nb 3 Sn winding test as well The cable did not form a concave shape at the ends, as observed in the Nb 3 Sn case Fluffiness of coil was virtually the same as with the Nb 3 Sn case – But cable seemed to want to “spring back” more, per technician’s observation Coil parts shape and fit seemed very similar between both cables wound with same tension Dec 17, 2013 D. Cheng19

Tension effects Higher tension did not seem to cause the cable to fit against the spacers better – Still needed significant azimuthal compression after all turns were wound – RE spacers fit tended to have similar gaps as seen in the Nb 3 Sn winding test – LE spacers also have similar gaps as seen in the Nb 3 Sn winding test Angle of cable against the pole/spacers, however, tended to be shallower with higher tension Dec 17, 2013 D. Cheng20

Summary The copper cable seems to behave reasonably well, compared with real cable – Parts shapes that don’t fit with one cable also didn’t seem to fit the other Without final curing press, it is still hard to confirm the final endshoe shape – Midplanes of both needed more clamping for position Dec 17, 2013 D. Cheng21