Development of a 40 T hybrid magnet at CHMFL

Transcription

1 Development of a 40 T hybrid magnet at CHMFL Yunfei Tan High Magnetic Field Laboratory, CAS (CHMFL) Jan.19,

2 Where is CHMFL? Science Island Anhui Province P. R. China Hefei Beijing CHMFL 1000km Shanghai 460km Science Island ---- a very beautiful peninsula! Area: 2.6 km2 2

3 Overview of SHMFF NMR FTIR Raman ESR MS High pressure SMA XRD Resistive Magnets ( 25T/Φ50) SQUID FIB Hybrid Magnets PPMS Low temperat ure Superconducting Magnets (27.5T/Φ32) ( 39T/Φ32) (20T/Φ200 ) (36T/ Φ50) (45T/Φ32) 20T/ Φ54(NMR) 9.4T/ Φ 400(MRI) 20T/Φ52(SMA) 8T/ Φ100/D100 Magnet Supporting System Power Supply Deionized Water System Cryogenic System High Central Control System Magnetic Field Lab,CAS 3

4 Magnets Constructed at CHMFL Resistive Magnets Superco nducting Magnet Hybrid Magnet Magnets Magnet Field, T Bore, mm Power, MW Current Status WM1 38.5* Open for users WM Testing WM Testing WM4 27.5* Open for users WM5 35* Open for users SM / Testing SM / Open for users SM / Open for users SM / Open for users HM1 45 T Resistive insert Under 34 T SC outsert 11 T construction * New Record 45 High T Magnetic Hybrid Magnet Field Lab,CAS 4

5 Bitter Magnet Solenoid can generate strong magnetic fields Bitter plate Schematic diagram of a Bitter Magnet Photo of a Bitter Magnet 5

6 Resistive Magnet Technology at CHMFL Prof. Francis Bitter Bitter Conductor Prof. H. Schneider-Muntau Prof. B. Gao Prof. Bingjun Gao is currently the chief engineer of our project, he is in charge of the design and manufacturing of the Bitter Magnets at CHMFL. High Florida-Bitter Magnetic Field Conductor Lab,CAS 6

7 Performance Analysis of Resistive Magnet Stress along the radius Forces within the Bitter Magnet Temperature distribution in the Bitter plates Displacement distribution in the Bitter plates 7

8 Fabrication and stacking of Bitter Plates The stacked sub-coils The assembled Bitter magnet 8

9 Magnet Supporting System 28 MW power supply, deionized water system and the central control system Diagram of 28 MW Power Supply Specifications Rated output voltage 500 V, 600 V, or 700 V Rated output current 2 20 ka Ripple and noise 50 ppm Stability (8 hours) 10 ppm Efficiency >90% 9

10 Hybrid Magnet at CHMFL It consists of a SC outsert and two interchangeable watercooled inserts with inner bores of 32 and 50 mm. Specifications No. Field (T) Bore (mm) Temp. (K) Current/ Power HSM kA HWM MW HWM MW The hybrid magnet is is the best way to to generate the highest steady high field. 10

11 Resistive Insert Specifications The resistive insert consists of of 6 subcoils, all all the resitive coils are made of of Bitter conductors. 11

12 Development of Resistive Coils Bitter Disks Six Coils Inner diameter 38 mm Outer diameter 710 mm 12

13 Overview of Superconducting Outsert 13

14 Development of SC Coils 14

15 Cable-in-Conduit Conductor Strand Cabling Cable Jacketing and Rolling Principle of CICCs CICC Different CICC structures manufactured for High different Magnetic devices Field Lab,CAS 15

16 Performance Degradation of Nb3Sn CICC Critical current versus electromagnetic cycles ITER TF conductor performance made from different Nb3Sn strands 16

17 Nb3Sn CICC design at CHMFL Reduce void Fraction Elongate twist pitch of the first stage Decrease electro-magnetic pressure Provide better mutual support between superconducting strands in the CICC and prevent degradation of strand performances. Simulation of CICC structure Improved CICC structure 17

18 Selection of Superconducting strands Specification of Nb 3 Sn strands Wire diameter (mm) Bare wire diameter (mm) Cr plated (µm) Cu/non-copper d eff (µm) Critical current, Ic (A) (4.2K,12T,0.1µV/cm) RRR n value Twist pitch (mm) Hysteresis loss (7T-0-7T cycle) (kj/m 3 ) Ø0.81± ± (non-cu Jc 2100A/mm 2 ) ±

19 Specifiction of Cable Design of CICC 线圈 A 线圈 B 线圈 C 线圈 D 电缆配置 (2Sc+1Cu) ((2Sc+1Cu) 3 + (1Sc+2Cu)) 3 5 (1Sc+2Cu)) ((1Sc+2Cu) 3 + 3Cu) 3 4 A 导体 B 导体 超导股线数目 铜股线数目 Specification of CICC 线圈 A 线圈 B 线圈 C 线圈 D 导体尺寸 (mm mm) 铠甲材料 Modified 316LN 铠甲厚度 (mm) 空隙率 (%) ~30 ~30 ~30 ~30 最大磁压 (Mpa) C 导体 D 导体 19

20 Performance analysis of Superconducting Outsert Mechanical performances analysis of the SC Outsert Thermal and electro-magnetic performances analysis High Magnetic of SC Outsert Field Lab,CAS 20

21 Performance Test of Model Coil Model coil is assembled in a 7.5 T background field magnet Performance tests of the model coil included: DC operation, fast discharging, AC losses, cyclic loading, etc. 21

22 Processing of SC Coils Nb3Sn superconducting fable 生产线 Nb3Sn CICC 11T/800mm outsert Superconducting cable (top) and conductor (bottom) processing Cooling support Superconducting coil winding manufacturing superconducting coil (2014) ; assembly (2015). 22

23 Test of Superconducting Magnet 23

24 Commissioning of Hybrid Magnet 24

25 A best test facility for HTS Insert YBCO 内插磁体低温杜瓦 水冷磁体实验平台 25

26 Summary Three resistive magnets have been constructed at CHMFL, the highest field can arrive 38.5T. The commissioning of our hybrid magnet can provide 40 T central field, a higher field more than 45 T can be expected. The resistive magnets developed in our lab will be a best test facility for developing HTS Insert. 26

27 Thanks for your attention! 27