1 wang,li/sinap wang li, wang shuhua, liu yiyong, sun sen, hu xiao, yin lixin shanghai institute of...

1WANG,Li/SINAP

WANG Li, WANG ShuHua, LIU YiYong,

SUN Sen, HU Xiao, YIN LiXin

Shanghai Institute of Applied Physics, CAS, Shanghai 201800, China

Shanghai Key Laboratory of Cryogenics & Superconducting RF Technology, Shanghai 201800, China

Superconducting Undulator Workshop, Apr. 28 – 29, 2014

Rutherford Appleton Laboratory, UK

Design of SINAP SCU Cryostat

SCU Workshop/RAL/UK, April 28-29

2WANG,Li/SINAP

Background

SCU Cryostat Design

Estimation of Heat Loads

Schedule

Contents


3SCU Workshop/RAL/UK, April 28-29 WANG,Li/SINAP

Background

• Since 2009, SINAP has started the research and development of SCU technology such as the winding skill of magnet coil.

• Last October, SINAP decided to develop one set of SCU prototype in order to study the key technologies including magnet winding, magnet structure, cooling, magnetic field measurement, and cryomodule integration & alignment for the future FELs projects in China.

• The SCU prototype is expected to be installed into BL13 or BL12 of the SSRF for on-line tests.

• Design of the SCU cryostat actually started just in this March. • The SCU cryostat is designed to be used for the on-line

prototype as well as off-line tests.

4WANG,Li/SINAP

Basic Parameters for SCU Prototype SC conductors NbTi/Cu=0.93(+/-0.05):1

Pole material FeCo alloy or Soft Ion (TBD)

Mandrel material DT4C

Period length (mm) 16

Period number 50

Magnetic gap (mm) (fixed) 8.0

Central peak field (T) >=0.88

Phase error (degree) ≤4

Operating current (A) Main coil: 398A； 2 End coils: 28 A, 34 A Magnetic storage energy (kJ) 41.185

Operating temperature（ K） 4.2

Magnet length (m) (Main coil + 2 end coils) 800+32=832

Length of Cryostat along the beam line (m) 1.8

Minimal beam gap (mm) ~5


5WANG,Li/SINAP

Cooling tube

Mandrel

Pole

Al alloy support frame

Beam chamber made of extruded Al alloy to be cooled at 20K

Magnet structure working at 4.2K

In & Out SC wires

68mm

5mm6mm

拉伸后的铝管道

机械加工后的铝真空管道

Material Al 6063Inner aperture

(mm2)5×11

Thickness (mm) 0.5Length (m) 3.27


6WANG,Li/SINAP

SCU Cryostat

Vacuum Chambers

Beam line-UHV

Cryostat-LV

Cooling

Magnet to be cooled at 4.2K

Beam chamber to be cooled at

20K

Current Leads-conduction

cooled

Thermal Shields

60K Thermal shield-Cu,

conduction cooled

20K Thermal shield-Cu,

conduction cooled

Supports

Seif-centered cold mass

supports made of non-metallic

materials

Thermal shields’ supports made of

non-metallic materials

Integration & Alignment

Beam axis position: at 1.3m above the ground; space limitation along the beam line direction

SCU Cryostat Design


7WANG,Li/SINAPSCU Workshop/RAL/UK, April 28-29

• Cooling: Cryocooler-cooled and independent cooling circuits for magnet and beam chamber

• SC magnet: to work at 4.2K, thermal-syphon cooling loops, “zero-vaporization”

• Beam chamber: to work at 20K, conduction-cooled

• Cu+HTS binary leads: conduction-cooled

• Thermal shields: 60K and 20K, conduction-cooled

• Standards or codes: conforming to Chinese codes for pressure piping and pressure vessels etc.

• Interface options for cooling: refrigerator cooling

4 x1.5W/4.2K Cryocoolers

2x1.5W/4.2K Cryocoolers

1st-stage cold head

To cool warm ends of HTS leads and 60K thermal shield

2nad-stage cold head

To cool magnet and cold ends of HTS leads

2xx1.5W/4.2K Cryocoolers

1st-stage cold head

To cool 60K thermal shield

2nd-stage cold head

To cool beam chamber and 20K shield

8WANG,Li/SINAP

Design Scheme


9WANG,Li/SINAP

Off-line Test Scheme

Off-line test scheme: without beam chamber and its cooling• Cooling test for magnet• Training of magnet• Magnetic field measurement

for magnet


10WANG,Li/SINAP

Overall Size

Overall size：Length-1,796mm；Width-1,363mm； Height-2,715mm

3D adjustable support stand

Vacuum chamberThermal shields

Magnet array

Beam chamber 936


11WANG,Li/SINAP

Cooling and Self-centered Supports

• Self-centered: to align the magnet and beam chamber well at RT, no need of alignment at LT

• To support the weight of magnets, ~200kg

• To stand the thermal stress• To minimize the heat loads through it to

the 4.2K cold mass• To be made of non-metallic materials


12WANG,Li/SINAP

• Conduction-cooled thermal shields• To provide thermal intercepts at 60 K

for cooling piping, cold mass support straps, etc.

• Temperature difference on the 60K shields: <5~10 K

• Temperature difference on the 20K shields: <2~5 K

• Material of shields: pure Copper • Weight of shields: 60K~235kg, 20K~150kg• Disassemble for tests and maintenance

Thermal Shields


13WANG,Li/SINAP

Estimation of Heat loads


14WANG,Li/SINAP

Heat Loads to 4.2 K

4.2K Heat Loads （ W） Q_4K (w/60K intercepts)

Q_4K (w/o Intercepts)

SCU magnet Radiation heat 0.108 0.108

Cryostat Radiation heat 0.393 0.393

　 Conduction heat through piping and supports

0.968 (to be reduced) 2.554

　 500A HTS leads 0.260 0.260

　 100A HTS leads 0.096 0.096

Total（ w/o contingence）

　 1.716 3.301

• If considering thermal intercepts for piping and supports at 20K, the estimated heat load at 4.2K is about 0.5 W.



Heat Loads to 20 K

20K Heat Loads (W) Q_20K

Beam chamber Dynamic load (assuming 20W/m) 35.000

　 Conduction heat 4.314 (to be lowered down)

Cryostat Radiation heat to 20K shield 0.661

　 Conduction heat through piping and supports 1.712 (to be lowered down)

Total（ w/o contingence）

41.687

16WANG,Li/SINAP

Heat Loads to 60 K

60K Heat Loads （ W） Q_60K (w/60K intercepts)

Q_60K (w/o Intercepts)

Radiation heat to 60K shield 6.904 6.904

Conduction heat through piping and supports 10.328 0.448

500A Cu leads (2) 46.008 46.008

100A Cu leads (4) 13.803 13.803

Total (w/o contingence） 77.043 67.163

Total (w/50% contingence） 115.565 100.745


17WANG,Li/SINAP

Schedule

• Preliminary Design (calculation, design optimization, etc. ) 05-14-2014

• Preliminary Design Review 05-15-2014

• Engineering design of test cryostat 06-30-2014

• Fabrication of test cryostat 09-30-2014

• Assembly and tests 11-30-2014

• Engineering design of SCU cryostat 12-31-2014

• Fabrication of SCU cryostat (up to funding status) 02-28-2015

• Assembly and tests of SCU cryostat 04-30-2015


18WANG,Li/SINAP

Conclusions

• The SINAP SCU cryostat is under preliminary design.

• Calculations and FEA simulations are being carried out to optimize the design in order to minimize the heat loads.

• There are still a lot of engineering details needed to be worked on.


1 wang,li/sinap wang li, wang shuhua, liu yiyong, sun sen, hu xiao, yin lixin shanghai institute of...

Documents

magnet scu workshopraluk

magnet length

wang shuhua

set of scu prototype

development of scu technology

magnet structure

magnet winding

beam chambersc magnet