Superconducting Undulator Development at SSRF

1. Superconducting Undulator Development at SSRF Zhengchen Zhang1,2 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. Outline 1.SSRF 2.Cryogenic Calorimeter 3.0.88T SCU Mock-up 4.1T Supermini Test coil 5.Conclusions

3. SSRF

4. 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 Storage Ring 3.5GeV,C=432m Booster 3.5GeV,C=180m Electron Linac 150MeV

5. 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 SSRF Main Parameters • 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. Beamlines under Construction & Plan • Proposed SSRF Phase-II Beamlines • Energy science 4 • Environ. science 3 • Material science 4 • Life science 2 • Industry application 3 • 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)

7. Cryogenic Calorimeter Cryogenic calorimeter Installed at SSRF storage ring

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

9. Cryogenic Calorimeter Beam heating load

10. 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. 0.88T SCU Mock-up Specifications of the Bit wires custom fabricated by WST

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

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

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

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

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

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

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

19. 0.88T SCU Mock-up SCU test coil before Ic test in helium bath

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

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

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

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

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

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

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

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

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

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

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

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

32. Supermini Supermini parameters

33. Supermini Supermini magnetic models

34. Supermini Supermini magnetic field without iron pole enhancement

35. Supermini Supermini demonstrator coil former

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

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

38. 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. 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. SCU Team

41. Thank you!