Post on 05-Jan-2016
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, China2.Shanghai Key Laboratory of Cryogenics & Superconducting RF
Technology, Shanghai 201800, China
Superconducting Undulator Workshop, Apr. 28 – 29, 2014, Rutherford Appleton Laboratory
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Outline
1.SSRF
2.Cryogenic Calorimeter
3.0.88T SCU Mock-up
4.1T Supermini Test coil
5.Conclusions
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SSRF
4 Electron Linac
150MeV
Booster3.5GeV,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
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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
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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
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Cryogenic Calorimeter
Cryogenic calorimeter Installed at SSRF storage ring
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Cryogenic Calorimeter
Cold head temperature results at different beam currents(Gap=20 mm）
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Cryogenic Calorimeter
Beam heating load
DateBeam
Current （mA）
Gap (mm)
2nd Cold Head Temp (K)
Heat Load （ W）
CryoMech Sumitomo
2013-10-07 220 20 18.41 27.01 21.2
2013-10-30 230 15 17.20 26.89 20.0
2013-11-11 230 10 17.71 28.64 21.6
2014-01-01 230 8 19.55 30.26 26.8
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0.88T SCU Mock-up
Spectral flux of the SCU mock-upE=3.5 GeV ， I=210 mA, ε=3.9 nm rad⋅
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Cu/SC ratio 0.93
R.R.R. 147
Number of filaments 55
Wire diameter (bare) (mm) 0.548
Wire diameter (insulated) (mm) 0.593
Engineering critical current at 4.2K 416.5A@4T353.0A@5T
Specifications of the Bit wires custom fabricated by WST
0.88T SCU Mock-up
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0.88T SCU Mock-up
Sketch of the SCU test coil formers
Pure iron DT4C
Groove4.85*6.5mm
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0.88T SCU Mock-up
SCU test coil wound with copper wires
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0.88T SCU Mock-up
SCU test coil wound with copper wires and impregnated with epoxy
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0.88T SCU Mock-up
SCU test coil winding profiles
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0.88T SCU Mock-up
SCU test coil wound with Bit wires
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0.88T SCU Mock-up
SCU test coil wound with Bit wires
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0.88T SCU Mock-up
SCU test coil wound with Bit wires
Before epoxy impregnation After epoxy impregnation
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0.88T SCU Mock-up
SCU test coil before Ic testin helium bath
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0.88T SCU Mock-up
Critical currents of the 5 period SCU test coil in quench training
1 2 3 4 5 6
270
280
290
300
310
320
Crtic
al C
urre
nts
(A)
Quench Sequences
0.7A/S
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0.88T SCU Mock-up
Operation point of the 5 period SCU test coil
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0.88T SCU Mock-up
5 period SCU test coil assembled with separated pole and core pieces
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0.88T SCU Mock-up
Separated pole and core pieces models
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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
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0.88T SCU Mock-up
5 period SCU mock-up magnetic field
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0.88T SCU Mock-up
SCU mock-up magnetic field 3D simulation
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0.88T SCU Mock-up
Magnetic field measurement design based on moving Hall probes
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0.88T SCU Mock-up
Magnetic field measurement design based on Cryogen-Free test facility
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0.88T SCU Mock-up
Cryogen-Free test facility
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0.88T SCU Mock-up
Coil winding machine
Cryostat and 500A DC power supplyMeasurement system
Epoxy impregnation device
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Supermini
12
34
bobbin 1
bobbin 2
2N-12N
Supermini coil wire path design
Proposed by Herbert O. Moser, visiting professor at SSRF
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Supermini
Supermini parameters
Parameters Value
Bmax1.0 T
λ 7 mm
Gap 2 mm
n 100
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Supermini
Supermini magnetic models
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Supermini
Supermini magnetic field without iron pole enhancement
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Supermini
Supermini demonstrator coil former
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Supermini demonstrator wound with copper wires
Front view
Back view
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Top view
Bottom view
Supermini demonstrator wound with copper wires
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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) .
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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.
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SCU Team
Projects Leaders Funds Members
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-up Lixin Yin NSFC project No. 11275254
CAS SINAPKnowledge 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
Supermini Herbert O. Moser (KIT)
CAS Visiting Professorship project
Jieping Xu, Zhengchen Zhang, Jian Cui, Yi Ding, Sen Sun, Shengwang Xiang, Wei Zhang
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Thank you!