FCC-hh 16 T, 1.9 K INFN Team October 2015.

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Presentation transcript:

FCC-hh 16 T, 1.9 K INFN Team October 2015

Why 1.9 K ? At 4.5 K the volume of conductor is quite large , cables have extreme dimensions, ratio Cu/Sc is 1/1, no margin left At 1.9 K is feasible owing to the large increase of critical current respect to 4.5 K B (T) Jc ( A/mm2) 4.5 K 1.9 K ratio (1.9/4.5) 14 2031 3005 1.48 16 1251 2048 1.64 18 695 1326 1.91 Based on the formula given in EuroCircCol-P2-WP5-04-09-2015

A conceptual design at 1.9 K Based on a design presented by Zlobin ( FERMILAB) at the FCC week 2015 Assumed peak field of 18 T on conductor giving 17.6 T bore field ( 10% margin) Assumed 4 layers i.e 2 double pancakes Two cables Insulation 0.2 mm /face Iron yoke far apart ( from 120 to 250 mm) Cables Strands/φ Cu/nonCu Width (mm) Mid thickness (mm) Inner 28 / 1.0mm 1/1 14.7 1.80 Outer 40 / 0.7 mm 1.5/1 1.25

The layout I= 12.0 kA Bo = 16 T ( I=13.4 kA for Bo=17.6 T) Layer 1-2 15+23 turns Layer 3-4 31+31 turns Total 100 turns Total width of the layers 60.4 mm

Field in the iron at Bo=16 T Strong saturation Field on the iron midplane By= 4.5-3.0 T Fringing field ( x=300 mm,y=0) By= 0.5 T

Forces at Bo=16 T Fx = 6.5 MN/m Fy = -4.1 MN/m

Field quality Inductance 20 mH/m Stored energy 1.28 MJ/m Not pursued, pending many unknows on cables dimensions, insulation thickness, position iron yoke ( i.e collar thickness) I = 12.0 kA MAIN FIELD (T) ..................................... 15.9167 NORMAL RELATIVE MULTIPOLES (1.D-4): b 1: 10000.00000 b 2: 0.00000 b 3: -4.82026 b 4: 0.00000 b 5: -0.54876 b 6: 0.00000 b 7: 0.43971 b 8: 0.00000 b 9: -1.86855 b10: 0.00000 b11: 1.60804 b12: 0.00000 Inductance 20 mH/m Stored energy 1.28 MJ/m

Conclusion A 16 T dipole at 4.5 K with a 10% margin has been envisaged at the limit of feasibility (with a low Cu/Sc ratio 1/1 for the outer layers) A conceptual design of a 16 T dipole at 1.9 K with a 10% margin is proposed At 1.9 K, a further margin increase of 5% look feasible possibly, with the same volume of superconductor since in this design the outer cable has more strands (40) than needed (30) A reduction of the insulation thickness from 0.2 mm to 0.15-0.125 mm could give a 2-3% margin increase owing to the better filling factor of the conductors in the layers A comparison of the dipole design at 4.5 K and 1.9 K is very useful, unless the temperature of 4.5 K is mandatory (why?)