1. Superconducting Undulator Development at SSRF Zhengchen Zhang 1,2 E-mail: zzc@sinap.ac.cn On behalf of SCU team 1.Shanghai Institute of Applied Physics, CAS, Shanghai 201800, China 2.Shanghai Key Laboratory of Cryogenics & Superconducting RF Technology, Shanghai 201800, China Superconducting Undulator Workshop, Apr. 28 – 29, 2014, Rutherford Appleton Laboratory

2. 1 Outline 1.SSRF 2.Cryogenic Calorimeter 3.0.88T SCU Mock-up 4.1T Supermini Test coil 5.Conclusions

3. 2 SSRF

4. 3 Electron Linac 150MeV Booster 3.5GeV,C=180m Storage Ring 3.5GeV,C=432m Beamlines 7 operation 6 construction Dec. 25, 2004 : Ground breaking Dec.24, 2007: First synchrotron light Apr. 29, 2009: Dedication of the SSRF May 6, 2009: Formally open to users Jan. 19, 2010: Government acceptance

5. 4 SSRF Main Parameters Storage Ring Energy: 3.5 GeV Circumference: 432 m Natural Emittance: 3.9 nm-rad Beam Current: 240mA (Top-up) Beam Lifetime: ~ 20 hrs Max. Beam Power: ~600kW  Macromolecular Crystallography (In-Vac Und.)  High-Resolution X-ray Diffraction (Bend)  X-ray Absorption Fine Structure Spectroscopy ( Wiggler)  Hard X-ray Micro-focus and Application (In-Vac Und.)  X-ray Imaging and Biomedical Application (Wiggler)  Small Angel X-ray Scattering (Bend)  Soft X-ray Microscopy (EPU) XIL Branch Beamline (EPU) Beamlines in Operation

6. 5 Beamlines under Construction & Plan  National Protein Science Facility - 2014  Three Protein crystallography beamlines (2×IVU+BM)  Small angle X-ray scattering beamline (IVU)  IR Beamline with two end-stations (BM)  Dreamline - 2014  Ultra high-resolution X-ray ARPES and PEEM (2×EPU)  Academic and industrial user invested projects – under design  Angle resolved photon electron spectroscopy (EPU)  Ambient pressure photon electron spectroscopy (BM)  Proposed SSRF Phase-II Beamlines  Energy science 4  Environ. science 3  Material science 4  Life science 2  Industry application 3

7. 6 Cryogenic Calorimeter Cryogenic calorimeter Installed at SSRF storage ring

8. 7 Cryogenic Calorimeter Cold head temperature results at different beam currents (Gap=20 mm ）

9. 8 Cryogenic Calorimeter Beam heating load Date Beam Current （ mA ） Gap (mm) 2 nd Cold Head Temp (K) Heat Load （ W ） CryoMechSumitomo 2013-10-072202018.4127.0121.2 2013-10-302301517.2026.8920.0 2013-11-112301017.7128.6421.6 2014-01-01230819.5530.2626.8

10. 9 0.88T SCU Mock-up Spectral flux of the SCU mock-up E=3.5 GeV ， I=210 mA, ε=3.9 nm ⋅ rad

11. 10 Cu/SC ratio0.93 R.R.R.147 Number of filaments55 Wire diameter (bare) (mm)0.548 Wire diameter (insulated) (mm)0.593 Engineering critical current at 4.2K416.5A@4T 353.0A@5T Specifications of the Bit wires custom fabricated by WST 0.88T SCU Mock-up

12. 11 0.88T SCU Mock-up Sketch of the SCU test coil formers Pure iron DT4C Groove 4.85*6.5mm

13. 12 0.88T SCU Mock-up SCU test coil wound with copper wires

14. 13 0.88T SCU Mock-up SCU test coil wound with copper wires and impregnated with epoxy

15. 14 0.88T SCU Mock-up SCU test coil winding profiles

16. 15 0.88T SCU Mock-up SCU test coil wound with Bit wires

17. 16 0.88T SCU Mock-up SCU test coil wound with Bit wires

18. 17 0.88T SCU Mock-up SCU test coil wound with Bit wires Before epoxy impregnationAfter epoxy impregnation

19. 18 0.88T SCU Mock-up SCU test coil before I c test in helium bath

20. 19 0.88T SCU Mock-up Critical currents of the 5 period SCU test coil in quench training

21. 20 0.88T SCU Mock-up Operation point of the 5 period SCU test coil

22. 21 0.88T SCU Mock-up 5 period SCU test coil assembled with separated pole and core pieces

23. 22 0.88T SCU Mock-up Separated pole and core pieces models

24. 23 0.88T SCU Mock-up End poles windings and currents 32093 A =387*83A 23406 A =387*60 A 5810 A =387*15A 642 A =28*23A 2312 A =34*68A

25. 24 0.88T SCU Mock-up 5 period SCU mock-up magnetic field

26. 25 0.88T SCU Mock-up SCU mock-up magnetic field 3D simulation

27. 26 0.88T SCU Mock-up Magnetic field measurement design based on moving Hall probes

28. 27 0.88T SCU Mock-up Magnetic field measurement design based on Cryogen-Free test facility

29. 28 0.88T SCU Mock-up Cryogen-Free test facility

30. 29 0.88T SCU Mock-up Coil winding machine Cryostat and 500A DC power supplyMeasurement system Epoxy impregnation device

31. 30 Supermini Supermini coil wire path design Proposed by Herbert O. Moser, visiting professor at SSRF

32. 31 Supermini Supermini parameters ParametersValue B max 1.0 T λ7 mm Gap2 mm n100

33. 32 Supermini Supermini magnetic models

34. 33 Supermini Supermini magnetic field without iron pole enhancement

35. 34 Supermini Supermini demonstrator coil former

36. 35 Supermini demonstrator wound with copper wires Front view Back view

37. 36 Top view Bottom view Supermini demonstrator wound with copper wires

38. 37 Next Steps 0.88T 16 mm, 50 periods SCU mock-up. Magnet winding, design review, fabrication, assembly, commissioning(Feb., 2016). 1T 7mm, 100 periods Supermini for SXFEL. Design, magnet winding, fabrication, assembly, commissioning(Dec., 2017).

39. 38 Conclusions Cryogenic calorimeter measurements show heating load at SSRF is 26.8 W at 8 mm gap. A 0.88T 16 mm*50 periods Bit SCU mock -up is under development at SSRF and a test coil has been wound, impregnated and tested: 312 A at 2.5 T, 88% of the critical current of the short NbTi sample. A 1T 7mm*4 periods Supermini demonstrator is under development.

40. 39 SCU Team Projects Leaders FundsMembers Cryogenic Calorimeter Jieping Xu / Soren Prestemon SINAP- LBNL Cooperation Jieping Xu, Jian Cui, Torsten Koettig, Dikui Jiang, Wei Li, Ming Li, Zhengchen Zhang SCU mock-upLixin YinNSFC project No. 11275254 CAS SINAP Knowledge Innovation Project Jieping Xu, Li Wang, Zhengchen Zhang, Jian Cui, Hongfei Wang, Wei Zhang, Shuhua Wang, Yi Ding, Xiao Hu, Yiyong Liu, Ming Li, Sen Sun, Yongmei Wen, Shengwang Xiang, Yong Jiang, Yong Fan, Shiyue Wang, Jian Wang SuperminiHerbert O. Moser (KIT) CAS Visiting Professorship project Jieping Xu, Zhengchen Zhang, Jian Cui, Yi Ding, Sen Sun, Shengwang Xiang, Wei Zhang

41. 40 Thank you!