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Support and magnet coil

Nov. 10, ‘04. Support and magnet coil. KEK Hiroshi Yamaoka. Initial configuration of the iron yoke. 3T. → Too large!!. Further amount of iron is necessary. Iron Yoke configuration is optimized!. Belle. Material for return yoke. S10C(JIS) Carbon= 0.1wt% s t =310MPa s e =205MPa

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Support and magnet coil

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  1. Nov. 10, ‘04 Support and magnet coil KEK Hiroshi Yamaoka

  2. Initial configuration of the iron yoke 3T → Too large!! Further amount of iron is necessary. Iron Yoke configuration is optimized!

  3. Belle Material for return yoke S10C(JIS) Carbon= 0.1wt% st=310MPa se=205MPa sallow=120MPa Permeability These dimensions are fixed, Coil length, yoke dimensions are changed.

  4. Calculations Coil-L dz 4.25m

  5. R2.05m R1.8m R1.0m R0.4m 2 1 0

  6. Magnetic field distribution Fringe/Leakage field Flux line

  7. Stress/deformation of End Yoke Fixed 18000tons Max. 90MPa<120MPa Max. 1.8mm

  8. Stress/deformation of Barrel Yoke 13300tons Fixed Fixed Max. 7mm Max. 65MPa<120MPa

  9. Superconducting Solenoid 4.3mm 30mm (For ATLAS) 4.2mm Aluminum stabilized superconductor NbTi:Cu:Al= 1:0.9:15.6 Strand diameter: 1.23mm Filament diameter: 20mm Jc in NbTi at 5T, 4.2K: > 2750A/mm2 Ic at 5T, 4.2K: > 20300A

  10. Support cylinder (t=50mm) Deformation of the coil Conductor (h=30mm) Solenoid center 8mm 4mm R4.0m 4.93m(Half) Stress level in the coil Development of High-strength Al Circum. direction Axial direction Compression By Makida

  11. Oct. 29, ’04 KEK H. Yamaoka Cryostat design Model-1 2000tons Load condition Weight of the calorimeter: 2000tons Weight of the solenoid : ～140tons Vacuum : 0.1MPa Fixed Fixed Model-2 Thickness of ・Inner vacuum vessel ・End plates were optimized. SUS304 st =530MPa sy =210MPa sallow=140MPa • Outer vac. vessel • 40mm thick Fixed Fixed p: Buckling pressure 0.1MPa x 2(safety factor) 2000tons

  12. 2000tons Fixed Fixed 2000tons x0.3G Fixed Fixed 2000tons Fixed Fixed Model-1 Model-2 t=40mm t=40mm t=60mm t=60mm t=100mm t=100mm 274MPa>140MPa 118MPa<140MPa Material: SUS304 9mm 15mm Stiffness: D 125MPa E: Young’s modulus I: Moment of Inertia 9mm

  13. R4400 t=50mm 4930(Half) R4000 t30mm, 2 layers 5250(Half) R3720 *Coil support system is not designed yet. Requests to calorimeter structure; - Calorimeter is divided to several pieces in the axial direction. - One piece of calorimeter is stiff enough. *Detail design is not yet done.

  14. Feb. 14, ’02 H. Y Cost estimation of Return Yoke ○ Law material \180/kg x 11000e3kg = \19.8 oku +a(10%) 19.8x1.1=21.8 oku ○ Machining Total area for machining of Barrel yoke 340m2 End Yoke: 501m2 Machining cost per 1m2 \200000/m2 Total: (340+501)m2x20万=16.8 oku +a(10%) 、 16.8x1.1=18.5 oku ○ Design cost 1 oku ○ Cost for QC 0.5 oku ○利益率 20％とすると、 41.8x0.2=8.4 oku Total 50.2 okux1.05=52.7 oku Cost estimation of Solenoid 

  15. The way for improving field uniformity Saturation Z1 Z2 Solenoid magnet R2 R1 3T ・Plenty of amount of iron ・Minimize Z1,R1 ・Optimize Z2,R2

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