Conceptual design of superconducting correctors for Hi-Lumi Project F. Toral - CIEMAT CIEMAT, Jan. 28th, 2013

Conceptual design: superferric Due to the moderate requirement on magnet strength, a superferric design is feasible. The superferric layout has three important advantages: 1) The coils are placed beyond the aperture diameter and wires are concentrated in a slot, compared to the broad extension of a cos-theta type coil. Both features yield higher radiation resistance. 2) The fabrication complexity and cost is lower, because coils are flat and besides the wire positioning tolerance is relaxed. 3) It is very well suited for short magnets with broad aperture. 1.5 T option Total length (m) 3,03   WP3 proposal Superferric option WP2 requirements Order Aperture Int Strenght at 50 mm Int strength Length Strenght Pole field ratio (adim) (mm) (T m) (T/m^(n-2)) (m) (T/m^(n-1)) (T) MCQSX Skew 2 150 1,00 20,0 1,000 20 1,500 MCSX Normal 3 0,06 24,0 0,090 267 MCSSX MCOX 4 0,04 320,0 3556 MCOSX MCDX 5 0,03 4266,7 47407 0,67 MCDSX 0,02 1,33 MCTX 6 0,08 252839,5 0,400 632099 0,12 0,66 MCTSX 56888,9 0,89 2

Conceptual design: superferric Vacuum impregnated coils Laminated ARMCO iron yoke Alignment by stainless steel keys Radiation resistance: Polyimide insulated NbTi wire CTD 422B: a blend of cyanate ester and epoxy resin Stainless steel coil spacers Duratron 2300 PEI connection plate and ancillary pieces Insulating sleeves made of polyurethane and glass fiber

Conceptual design: superferric 4

Conceptual design: superferric 5

First magnetic calculations Full 3-D simulation has been performed using Roxie. It is not an optimal solution, it is just a proof of principle. The separation between mechanical lengths is 40 mm. Connections are made in 20 mm of longitudinal length. Overall length is 2.958 m. A nonlinearity of the transfer function up to 5% is assumed as non problematic. Roxie simulation Total length (m) 2,958   Superferric option WP2 requirements Order Aperture Int Strenght at 50 mm Int strength Mech length Strength Pole field 2-D Saturation Coil length Coil straight length Block current Number of turns Current Wire bare diameter L required/given (mm) (T m) (T/m^(n-2)) (m) (T/m^(n-1)) (T) (adim) (A) (H) MCQSX Skew 2 150 1,014 0,914 1,75 1,04 0,896 0,864 53000 346 153,2 0,7 1,99 1,00 1,01 MCSX Normal 3 0,060 0,136 1,25 0,116 0,092 24000 228 105,3 0,5 0,167 0,06 MCSSX MCOX 4 0,040 0,140 1,02 0,120 0,096 17400 165 105,5 0,093 0,04 MCOSX MCDX 5 0,170 1,40 1,05 0,150 0,126 0,138 MCDSX 0,02 2,00 MCTX 6 0,119 0,608 1,65 0,588 0,564 16600 100,6 0,6 0,12 MCTSX 0,020 0,144 0,124 0,100 14000 84,8 0,111 6

First magnetic calculations: octupole The fringe field goes beyond the mechanical length of the magnet. No significant cross-talk between the magnets is expected, but must be checked. 7

Conclusions A baseline design of superferric magnets complies with the specifications. Some open points are still pending: Cross-talk between adjacent magnets. Maximum allowable non-linearity of the transfer function. Nominal current (that is, available power supplies and leads). The framework for this Collaboration needs to be defined. 8