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Zian Zhu

Concept Design of BESIII Superconducting Magnet. Zian Zhu. Basic parameters Coil design Magnetic field analysis Cryostat design Coil support structure Cryogenics Yoke configuration Cost and milestone. BESIII Collaboration Meeting, June 5~6, 2002, Zian Zhu.

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Zian Zhu

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  1. Concept Design of BESIII Superconducting Magnet Zian Zhu • Basic parameters • Coil design • Magnetic field analysis • Cryostat design • Coil support structure • Cryogenics • Yoke configuration • Cost and milestone BESIII Collaboration Meeting, June 5~6, 2002, Zian Zhu

  2. Concept Design of BESIII Superconducting Magnet Basic Parameters • Physics requirement • Central field B = 1.0 T • Dimension of magnet(RT volume): L = 3.9 m, D = 2.65 m • Uniformity B/B < 5% in the tracking volume • Cool-down time t < 10 days • Configuration • Single layer solenoid coil, steady field • In-direct cooling by two phase flow liquid helium • Pure aluminum based stabilizer • NbTi/Cu superconductor • Ramp rate: reached to operating current in 0.5hours • Recovery time: <1 day • Field stability: 5×10-4 BESIII Collaboration Meeting, June 5~6, 2002, Zian Zhu

  3. Concept Design of BESIII Superconducting Magnet Basic Parameters BESIII Collaboration Meeting, June 5~6, 2002, Zian Zhu

  4. Concept Design of BESIII Superconducting Magnet Coil Design 3.2mm2 ,I=3000A 921 turns for a 3.5m long coil ,w=3.7mm = 9.2MJ = 2H Cross section of the superconducting cable 70K 4N Purity aluminum-stabi1izer RRR=~300 20mm Working 3000A@1T-----Critical 6000A@2T NbTi wire，JC=3800A/mm2@2T, NbTi/Cu ratio 1.09:1 Cross Section Area of NbTi/Cu: 3.2mm2 BESIII Collaboration Meeting, June 5~6, 2002, Zian Zhu

  5. Concept Design of BESIII Superconducting Magnet Coil Design Stress in the Coil Radial Magnetic Pressure Hoop stress t is thickness of coil plus support cylinder When thickness of support cylinder is15mm, t=35mm Maximum hoop stress is 19 Mpa BESIII Collaboration Meeting, June 5~6, 2002, Zian Zhu

  6. Concept Design of BESIII Superconducting Magnet Coil Design Other analysis Estimation of coil Ohmic heats by th joints: 2.54 mW Voltage versus length of quench area in the coil BESIII Collaboration Meeting, June 5~6, 2002, Zian Zhu

  7. Concept Design of BESIII Superconducting Magnet Coil Design Coil Cross Section BESIII Collaboration Meeting, June 5~6, 2002, Zian Zhu

  8. Concept Design of BESIII Superconducting Magnet Magnetic field analysis Flux line Contour plot BESIII Collaboration Meeting, June 5~6, 2002, Zian Zhu

  9. Concept Design of BESIII Superconducting Magnet Magnetic field analysis field uniformity inside the Drift chamber B along beam axis BESIII Collaboration Meeting, June 5~6, 2002, Zian Zhu

  10. Concept Design of BESIII Superconducting Magnet Magnetic field analysis End Yoke L1~L9 30,30,30,30,30,40, 80, 80, 300mm Barrel Yoke L1~L9 20,20,20,40,40,80,80,100, 400mm End Yoke L1~L9 30,30,30,30,30,40,80,80,80mm Barrel Yoke L1~L9 30,30,30,40,40,80,80,80,80mm When anti-solenoid excited End Yoke L1~L9 30,30,30,30,30,40,80, 80,300mm Barrel Yoke L1~L9 30,30,30,40,40,80,80,80,400mm BESIII Collaboration Meeting, June 5~6, 2002, Zian Zhu

  11. Concept Design of BESIII Superconducting Magnet Cryostat Design Outer cylinder,Inner cylinder,End plates Material: SUS316L Buckling check Mechanical strength check BESIII Collaboration Meeting, June 5~6, 2002, Zian Zhu

  12. Concept Design of BESIII Superconducting Magnet Cryostat Design Thickness: Outer vessel =16 mm Inner vessel = 5 mm End vessel = 32 mm Max. Stress: 43 MPa Max. Deformation: 0.18mm BESIII Collaboration Meeting, June 5~6, 2002, Zian Zhu

  13. Concept Design of BESIII Superconducting Magnet Coil Support Structure Rods material: GFRP 12 axial support rods at chimney side 12 radial support rods 6 at each end BESIII Collaboration Meeting, June 5~6, 2002, Zian Zhu

  14. Concept Design of BESIII Superconducting Magnet Coil Support Structure Diameter of the rods for the nitrogen shield is 15mm, 6mm for radial and axial support. BESIII Collaboration Meeting, June 5~6, 2002, Zian Zhu

  15. Concept Design of BESIII Superconducting Magnet Weight and Radiation thickness BESIII Collaboration Meeting, June 5~6, 2002, Zian Zhu

  16. Concept Design of BESIII Superconducting Magnet Cryogenics BESIII Collaboration Meeting, June 5~6, 2002, Zian Zhu

  17. Concept Design of BESIII Superconducting Magnet Cryogenics Cooling Type Normal: Forced 2-Phase Helium Cooling Trouble: Thermo-syphon Cooling Volume of Working Fluid Coil: 50 L Service Port: 200 L Shield: 16 L Coil Pipe Outer Diameter: 31 mm Inner Diameter: 25 mm Total Length: 102 m Number of Line: One Shield Pipe Outer Diameter: 18 mm Inner Diameter: 14 mm Total Length: 70 m Number of Line: Two (One for each side) BESIII Collaboration Meeting, June 5~6, 2002, Zian Zhu

  18. Concept Design of BESIII Superconducting Magnet Cryogenics BESIII Collaboration Meeting, June 5~6, 2002, Zian Zhu

  19. Concept Design of BESIII Superconducting Magnet Yoke Configuration End Yoke L1~L9 30,30,30,30,30,40,80, 80,300mm Barrel Yoke L1~L9 30,30,30,40,40,80,80,80,400mm BESIII Collaboration Meeting, June 5~6, 2002, Zian Zhu

  20. Concept Design of BESIII Superconducting Magnet Magnet support structure BESIII Collaboration Meeting, June 5~6, 2002, Zian Zhu

  21. Concept Design of BESIII Superconducting Magnet Cost Estimation BESIII Collaboration Meeting, June 5~6, 2002, Zian Zhu

  22. Concept Design of BESIII Superconducting Magnet Milestone BESIII Collaboration Meeting, June 5~6, 2002, Zian Zhu

  23. Concept Design of BESIII Superconducting Magnet Acknowledgement KEK experts group: Prof. H.Tsuchiya, Y.Makida, H.Yamaoka. Design group members: S. Han, L.Liu Leaders: S. Kurokawa, Weiguo Li BESIII Collaboration Meeting, June 5~6, 2002, Zian Zhu

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