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

2

Outline

1.SSRF

2.Cryogenic Calorimeter

3.0.88T SCU Mock-up

4.1T Supermini Test coil

5.Conclusions

3

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!