MQXFB Spare Coils Susana Izquierdo Bermudez 10032021 logo

MQXFB Spare Coils Susana Izquierdo Bermudez 10/03/2021 logo area

MQXFB Coil Dashboard MQXFB 01 (115, 117, 118, 119) MQXFBP 2 (110, 111, 112, 113) 109 (Spare) MQXFBP 1 (104, 105, 107, 108) Quarantined coils: • 114: QH to coil short after impregnation, repaired • 116: Damaged during handling when preparing for assembly Susana Izquierdo Bermudez, 2

MQXFB Coil Dashboard Fine tunning of coil cross section (b 6 correction) Change on quench heater layout if all tests successful Susana Izquierdo Bermudez, 3

Spare coil - 109 § Coil 109: § Production date: May-October 2018 § Cross section before b 6 correction (as MQXFBP 1 coils) § Passed all electrical tests, although it is a coil from the time we had serious problems with the coating of the end-spacers (see EDMS 2019982) § 11 T end spacers don’t have coating, so having no-coating doesn’t automatically translate on having bad insulation. Susana Izquierdo Bermudez, 4

Spare coil - 109 § b 6 correction means that we increase the pole insulation by 0. 125 mm and decrease the mid-plane insulation by 0. 125 to increase b 6 by about 5 units § The achieved measured correction is close to what we were expecting (BP 1 before b 6 correction, BP 2/B 01 after b 6 correction) After loading, all magnets 4, 00 2, 00 0, 00 MQXFBP 1 -2, 00 -4, 00 MQXFBP 2 -6, 00 MQXFB 01 -8, 00 3σ+σ (unc. ), d = 30 μm -10, 00 b 3 a 3 b 4 a 4 b 5 a 5 b 6 a 6 b 7 a 7 b 8 a 8 b 9 a 9 b 10 a 10 bn (before bn (after b 6 correction) 6 -2. 02 3. 24 10 -0. 11 0. 18 Harmonics at Rref = 50 mm 6, 00 Susana Izquierdo Bermudez, 5

Spare coil - 109 § What if we mix coils before/after correction? 3 old and 1 new (corrected b 6) New coil is in quadrant 1 bn an 3 0. 16 -0. 16 4 -0. 02 1. 71 5 1. 39 6 -0. 72 0. 00 7 0. 41 -0. 41 8 0. 00 -0. 12 9 0. 04 10 -0. 04 0. 00 3 new (corrected b 6) and 1 old Old coil is in quadrant 1 bn an 3 -0. 17 0. 16 4 0. 00 -1. 72 5 -1. 38 6 1. 92 0. 00 7 -0. 41 8 0. 00 0. 12 9 -0. 04 10 0. 11 0. 00 Grad (T/m) diff (units) 4 coils Before b 6 correction 132. 6018 4 coils After b 6 correction 132. 8172 16 3 coils After b 6/1 coil Before correction 132. 7624 12 3 coils Before b 6/1 coil After correction 132. 654 4 Susana Izquierdo Bermudez, 6

Spare coil - 125 § If all goes well in terms of coil fabrication for coils 121 -124, coil 125 will be a spare with the same configuration as coils assembled in MQXFBP 2, MQXFB 01 and MQXFB 02. § If QH developments are successful, from coil 126 we will have a new layout § 1 out of the 3 S 2 glass 0. 125 mm thick layers we put on the outer diameters will be replaced by 0. 060 mm layer of E-glass between heater and coil and 0. 050 mm cover-lay on top of the heaters. 2 x. 0125 mm S 2 -Glass 3 x. 0125 mm S 2 -Glass Old QH (0. 050 mm polyimide + glue + metal) Coil New encapsulated QH (0. 050 mm polyimide + glue + metal + 0. 050 polyimide cover-lay) New E-glass fiber 0. 060 mm thick Susana Izquierdo Bermudez, 7

Spare coil - 125 § What if we mix coils? § Normal operation, i. e. , with CLIQ, negligible impact if we put coil 125 in quadrant 2 (3 K in the hot-spot, 2 V in the peak voltage) § In case of CLIQ failure, the impact on the voltage is 50 -165 V. If coil 125 is placed in quadrant 4 to limit the impact in the voltage to 50 V. Emmanuele Ravaioli Susana Izquierdo Bermudez, 8