CERN MBHSM0101 and Plan for Future Models F. Savary on behalf of the 11T Dipole Project Team

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3 Main design features Single aperture, 6-bloc design 56 turns 22 on IL (4 blocs) 34 on OL (2 blocs) Aperture: 60 mm Coil length: 1.8 m Yoke OD: 510 mm Shell thickness: 12 mm [AISI 304L] One SC coil, ID105

Click here to add footer 4 Specific features Copper coil #101 End spacers CERN v0, longer coil Sc coil #105 Cable OST RRP 108/127 ODS alloy wedges (Oxide Dispersion Strengthening ) CERN V4 end spacers SLS (Selective Laser Sintering) with springy legs - hinge Metallic saddles and splice blocks External trace, glued on coil OD, carrying V-taps and quench heaters Collars and yoke laminations produced by EDM (Electrical Discharge Machining) Collars YUS130S Nippon Steel 3 mm thickness (LHC dipole) Yoke laminations Arcelor Magnetil Low C steel 5.8 mm thickness (LHC dipole)

Click here to add footer 5 Assembly conditions - Winding Winding tension: Coil #101: 300 N; insulation defects: >1 Coil #105: 250 N; insulation defects: 0 Cable insulation Coils #101 and #105: Outer sleeve: AGY S-2 Glass 11 Tex, direct braiding Inner dielectric: Cogebi Firox 80 µ m Mica – Fiber glass tape Winding monitoring during coil #105 production D. Smekens J. Mazet Coils longer than expected: ~20 mm

Click here to add footer 6 Binder curing Binder CTD 1202-X; qty: Coil #101 IL: in excess; OL: in excess; Coil #105 IL: 100 g; OL: 100 g; Shimming: nominal (shimming such that in the press the mid-plane of the cured coil is like in the magnet; 0.12 mm above center axis) This is different compared to FERMILAB where oversized shimming is used to compact the coil mid-plane beyond its nominal position in order to obtain a smaller coil size before entering into reaction With a load of 0.8 MN, the mold is nearly closed (< 0.1mm) Then, a load of 2 MN is used for IL, and 4.2 MN for the OL (complete pole) The stress in the coils may not exceed 37 MPa at that stage D. Smekens J. Mazet

Click here to add footer 7 Reaction treatment Cavity of the reaction fixture is radially bigger than the curing mold by 0.1 mm; and of similar dimension at coil mid-plane Thus, if the curing press can be closed before reaching 37 MPa, the coil cannot be subjected to higher stress when closing the fixture. However, the dry fiber glass, and the tight tolerances induce large friction; also, a possible dimensional problem with the sealing foils could have generated interference between the sealing foil and the baseplate, preventing correct closure of the fixture The tightening torque to close the fixture was of the order of 300 Nm (FNAL applies 110 Nm to 160 Nm) Not clear: no coil contraction after reaction, actually less that 1 mm, when 4.5 mm were expected D. Smekens N. Bourcey F. Lackner

Click here to add footer 8 Reaction treatment – Coil 105 Adjustment of dwell time to compensate the delay between the temperature and tooling temperature The homogeneity of T during ramp up was not very good, ± 9°C. However, it is OK during dwell time N. Bourcey F. Lackner

Click here to add footer 9 Impregnation Resin: CTD 101K Anhydride cured epoxy system with excellent performance at cryogenic temperature, and radiation resistance The resin is preheated, and the coil is impregnated at 60°C 110°C for 5 hours Post curing 125°C for 16 hours R. Gauthier D. Smekens Temperature [°C]Pot life [h] Viscosity [mm · Pa/s]

Click here to add footer 10 Coils size Both coils, 101 and 105, were oversized, only in the mid-plane Best-fit on the outer diameter and the loading plates (interface with pole)

Click here to add footer 11 Excess in mid-plane

Click here to add footer 12 Collaring steps With 8MN the mechanical stops of the collaring tool were in contact

Click here to add footer 13 Shimming plan Mid-plane is 650 µm beyond expectations. To compensate: One layer of Kapton was removed on the mid-plane Changed one layer of insulation to 0.05 µm thickness (in lieu of µm)

Click here to add footer 14 Yoking / welding of the shells F. Lackner Max. charge: 500 t/m on central section to close the welding gap

Click here to add footer 15 FEA Results Collar-nose Stress (MPa) Coil Min Stress (MPa) Coil Max Stress (MPa) Avg Shell Stress (MPa) Collaring Load Post-Collaring Collar in yoke Max Force in Welding Press Shell Weld + Press Force Shell Welded, no Press Force Cool Down (4.3K) Cool Down (1.9K) T

Click here to add footer 16 Bullet gauges loading M. Guinchard P. Grosclaude 8 to 9 kN per bullet

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Click here to add footer 19 DesignationTypeStrand typeCoil IDStatusNext steps / Remark MBHSM01011 coilCu – 108/ DoneAnalysis MBHSP01011-in-1108/ / – 107 Collaring done 10 days ago Shell welding in early Sept., and cold tests as from middle of Sept. MBHSP01021-in-1132/ / – 109 Winding of 1 st coil done Finish assembly by end 2014, and do testing in Jan. 15 MBHSP01031-in-1PIT – 112 To be done, one cable unit length available Testing in April/May 15 MBHDP01012-in-1108/ /169106/107 – 108/109 To be done as soon as testing of MBHSP0102 is finished No new coil MBHDP01022-in-1108/127 – PIT114106/107 – 111/112 To be done as soon as testing of MBHSP0103 is finished No new coil MBHSP01041-in-1132/ / – 115 To be done as soon as MBHSP0103 is finished MBHDP01032-in-1132/ /169108/109 – 114/115 To be done as soon as testing of MBHSP0104 is finished No new coil