MQXFS Coil Impregnation Procedure and Discussion 11/13/2014

MQXFS Coil 01 2

MQXFS Coil 02 3

Filling the gap for L2 Before curing L2 After curing L2 or before reaction After reaction using laser-cut S2 glass 4

SQXF Coil Impregnation Impregnation process varies some between labs due to facility differences: BNL: –Impregnation fixture closed and sealed. –Strip heaters mounted to outside of fixture used for heating. –Fixture hung vertically in vacuum tank. –Evacuated to 500 mTorr or below. –While under vacuum, bake at 110 C for 8 hours. –Cool back to 55 C prior to impregnation. –Epoxy mixed and warmed to 55 C. –Epoxy degassed to same vacuum level as coil. –Once degassed, epoxy pot is let up to atmospheric pressure to start flow. –Epoxy introduced into bottom of impregnation fixture (NL end of coil). –Fill rate controlled by peristaltic pump, rate of approx. 25 cc / min for about 2 hour fill. –Exit line from top of fixture connected to resin trap outside of vacuum tank. –When epoxy reaches resin trap the exit line is closed. –Supply line remains open, with atmospheric pressure continuing to force resin into coil. –Soak overnight at 55 C, while allowing epoxy to continue to draw into coil. –Maintain vacuum in tank. 5

SQXF Coil Impregnation FNAL: –Impregnation fixture connected to open reservoir at LE. –Fixture inclined in vacuum furnace. –Evacuated to 25 mTorr. –While under vacuum, bake at 55 C for 45 hours. –Epoxy mixed and warmed to 55 C, degassed. –Fill rate observed through glass tube. –When epoxy reaches reservoir the supply line is closed. –Furnace let up to atmospheric pressure. –Soak overnight at 55 C. –Fixture then moved to curing oven. 6

SQXF Coil Impregnation LBL: –Impregnation fixture connected to open reservoir at LE. –Strip heaters mounted to aluminum plates on outside of fixture used for heating. –Fixture inclined in vacuum tank. –Evacuated to approx. 100 mTorr. –While under vacuum, bake at 110 C for 6 hours. –Cool back to 60 C prior to impregnation. –Epoxy mixed and warmed to 55 C. –Epoxy degassed to approx. 300 mTorr. –Vacuum chamber is increased to approx mTorr. –Supply line unclamped to start fill. –When epoxy reaches reservoir the supply line is closed. –Vacuum chamber let up to atmosphere pressure then pumped down again – 2X. –Chamber let up to atmospheric pressure. –Soak overnight at 55 C. 7

SQXF Coil Impregnation CERN Test of the impregnation mold –Passing N through to ensure no obstruction in the cavity –Vacuum sealing test Dry and outgas the mold –Dry mold during 2 h using N flow –Mold pre-heated to 60 0 C –Pump vacuum in the impregnation chamber (5E -2 mbar) and outgassing for 48h Resin preparation in the mixing unit –Introduce mixed CTD 101K resin in the reservoir (peristaltic pump) –Warm up the resin to 60 0 C and outgassing to 5E -2 mbar Resin injection –Lower vacuum in the tank and mold –Open injection valve –Fill the mold with resin and close injection valve Resin curing –Curing cycle: 6 h at C and 16 h at C and free cool-down Cool down and cleaning –Purge of exceeding resin –Reservoir cool-down to room temperature –Cleaning cycles using alcohol (stir 5 mn and purge) 8