WANG Li , WANG ShuHua , LIU YiYong , SUN Sen , HU Xiao, YIN LiXin

1. Design of SINAP SCU Cryostat 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 WANG,Li/SINAP

2. Contents WANG,Li/SINAP

3. 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. WANG,Li/SINAP

4. Basic Parameters for SCU Prototype WANG,Li/SINAP

5. Cooling tube In & Out SC wires Al alloy support frame 拉伸后的铝管道 Mandrel Pole Magnet structure working at 4.2K 机械加工后的铝真空管道 68mm 5mm 6mm Beam chamber made of extruded Al alloy to be cooled at 20K WANG,Li/SINAP

6. SCU Cryostat Design WANG,Li/SINAP

7. Cooling: Cryocooler-cooled and independent cooling circuitsformagnet 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: conformingtoChinesecodesforpressurepipingandpressurevessels etc. • Interface options for cooling: refrigerator cooling WANG,Li/SINAP

8. Design Scheme WANG,Li/SINAP

9. 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 WANG,Li/SINAP

10. Overall Size Vacuum chamber Thermal shields Magnet array 936 Beam chamber 3D adjustable support stand Overall size： Length-1,796mm；Width-1,363mm；Height-2,715mm WANG,Li/SINAP

11. 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 WANG,Li/SINAP

12. Thermal Shields • 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 WANG,Li/SINAP

13. Estimation of Heat loads WANG,Li/SINAP

14. Heat Loads to 4.2 K • If considering thermal intercepts for piping and supports at 20K, the estimated heat load at 4.2K is about 0.5 W. WANG,Li/SINAP

15. Heat Loads to 20 K WANG,Li/SINAP

16. Heat Loads to 60 K WANG,Li/SINAP

17. 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 WANG,Li/SINAP

18. 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. WANG,Li/SINAP

19. Thank you! WANG,Li/SINAP