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
Outline
1.SSRF
2.Cryogenic Calorimeter
3.0.88T SCU Mock-up
4.1T Supermini Test coil
5.Conclusions
1
SSRF
2
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
Storage Ring
Jan. 19, 2010: Government acceptance
3.5GeV,C=432m
Booster
3.5GeV,C=180m
3
Electron Linac
150MeV
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)
Beamlines
in Operation
 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)
4
XIL Branch Beamline (EPU)
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
5
Cryogenic Calorimeter
Cryogenic calorimeter Installed at SSRF storage ring
6
Cryogenic Calorimeter
Cold head temperature results at different beam currents
(Gap=20 mm）
7
Cryogenic Calorimeter
2nd Cold Head Temp (K)
Date
Beam
Current
（mA）
Gap (mm)
CryoMech
Sumitomo
Heat Load
（W）
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
Beam heating load
8
0.88T SCU Mock-up
Spectral flux of the SCU mock-up
E=3.5 GeV，I=210 mA, ε=3.9 nm⋅rad
9
0.88T SCU Mock-up
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@4T
353.0A@5T
Specifications of the Bit wires custom fabricated by WST
10
0.88T SCU Mock-up
Pure iron DT4C
Groove
4.85*6.5mm
Sketch of the SCU test coil formers
11
0.88T SCU Mock-up
SCU test coil wound with copper wires
12
0.88T SCU Mock-up
SCU test coil wound with copper wires and impregnated with epoxy
13
0.88T SCU Mock-up
SCU test coil winding profiles
14
0.88T SCU Mock-up
SCU test coil wound with Bit wires
15
0.88T SCU Mock-up
SCU test coil wound with Bit wires
16
0.88T SCU Mock-up
Before epoxy impregnation
After epoxy impregnation
SCU test coil wound with Bit wires
17
0.88T SCU Mock-up
SCU test coil before Ic test
in helium bath
18
0.88T SCU Mock-up
320
Crtical Currents (A)
310
300
0.7A/S
290
280
270
1
2
3
4
5
6
Quench Sequences
Critical currents of the 5 period SCU test coil in quench training
19
0.88T SCU Mock-up
Operation point of the 5 period SCU test coil
20
0.88T SCU Mock-up
5 period SCU test coil assembled with separated pole and core pieces
21
0.88T SCU Mock-up
Separated pole and core pieces models
22
0.88T SCU Mock-up
32093 A
=387*83A
23406 A
=387*60 A
642 A
=28*23A
5810 A
=387*15A
2312 A
=34*68A
End poles windings and currents
23
0.88T SCU Mock-up
5 period SCU mock-up magnetic field
24
0.88T SCU Mock-up
SCU mock-up magnetic field 3D simulation
25
0.88T SCU Mock-up
Magnetic field measurement
design based on moving Hall probes
26
0.88T SCU Mock-up
Magnetic field measurement design based on Cryogen-Free test facility
27
0.88T SCU Mock-up
Cryogen-Free test facility
28
0.88T SCU Mock-up
Epoxy impregnation device
Coil winding machine
Measurement system
29
Cryostat and 500A DC power supply
Supermini
Proposed by Herbert O. Moser, visiting professor at SSRF
2N
2N-1
4
3
2
1
bobbin 1
bobbin 2
Supermini coil wire path design
30
Supermini
Parameters
Value
Bmax
1.0 T
λ
7 mm
Gap
2 mm
n
100
Supermini parameters
31
Supermini
Supermini magnetic models
32
Supermini
Supermini magnetic field without iron pole enhancement
33
Supermini
Supermini demonstrator coil former
34
Back view
Front view
Supermini demonstrator
wound with copper wires
35
Bottom view
Top view
Supermini demonstrator
wound with copper wires
36
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) .
37
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.
38
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
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
CAS SINAP
Knowledge
Innovation Project
Supermini
Herbert O. Moser
(KIT)
CAS Visiting
Professorship
project
39
Jieping Xu, Zhengchen
Zhang, Jian Cui, Yi Ding, Sen
Sun, Shengwang Xiang, Wei
Zhang
Thank you!
40