1 WANG,Li/SINAP WANG Li, WANG ShuHua, LIU YiYong, SUN Sen, HU Xiao, YIN LiXin Shanghai Institute of Applied Physics, CAS, Shanghai 201800, China Shanghai.

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Presentation transcript:

1 WANG,Li/SINAP WANG Li, WANG ShuHua, LIU YiYong, SUN Sen, HU Xiao, YIN LiXin Shanghai Institute of Applied Physics, CAS, Shanghai , China Shanghai Key Laboratory of Cryogenics & Superconducting RF Technology, Shanghai , 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 SCU Workshop/RAL/UK, April 28-29

3WANG,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 conductorsNbTi/Cu=0.93(+/-0.05):1 Pole materialFeCo alloy or Soft Ion (TBD) Mandrel materialDT4C Period length (mm)16 Period number50 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) 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 SCU Workshop/RAL/UK, April 28-29

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 5mm 6mm 拉伸后的铝管道机械加工后的铝真空管道 MaterialAl 6063 Inner aperture (mm 2 )5×11 Thickness (mm)0.5 Length (m)3.27 SCU Workshop/RAL/UK, April 28-29

6 WANG,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 SCU Workshop/RAL/UK, April 28-29

7WANG,Li/SINAP 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 1 st -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 1 st -stage cold head To cool 60K thermal shield 2 nd -stage cold head To cool beam chamber and 20K shield

8 WANG,Li/SINAP Design Scheme SCU Workshop/RAL/UK, April 28-29

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 SCU Workshop/RAL/UK, April 28-29

10WANG,Li/SINAP Overall Size Overall size ： Length-1,796mm ； Width-1,363mm ； Height-2,715mm 3D adjustable support stand Vacuum chamber Thermal shields Magnet array Beam chamber  936 SCU Workshop/RAL/UK, April 28-29

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 SCU Workshop/RAL/UK, April 28-29

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 SCU Workshop/RAL/UK, April 28-29

13WANG,Li/SINAP Estimation of Heat loads SCU Workshop/RAL/UK, April 28-29

14 WANG,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 heat0.108 Cryostat Radiation heat0.393 Conduction heat through piping and supports (to be reduced) A HTS leads A HTS leads0.096 Total （ w/o contingence ） If considering thermal intercepts for piping and supports at 20K, the estimated heat load at 4.2K is about 0.5 W. SCU Workshop/RAL/UK, April 28-29

15WANG,Li/SINAP Heat Loads to 20 K 20K Heat Loads (W)Q_20K Beam chamber Dynamic load (assuming 20W/m) Conduction heat4.314 (to be lowered down) Cryostat Radiation heat to 20K shield0.661 Conduction heat through piping and supports (to be lowered down) Total （ w/o contingence ）

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 shield6.904 Conduction heat through piping and supports A Cu leads (2) A Cu leads (4) Total (w/o contingence ） Total (w/50% contingence ） SCU Workshop/RAL/UK, April 28-29

17WANG,Li/SINAP Schedule Preliminary Design (calculation, design optimization, etc. ) Preliminary Design Review Engineering design of test cryostat Fabrication of test cryostat Assembly and tests Engineering design of SCU cryostat Fabrication of SCU cryostat (up to funding status) Assembly and tests of SCU cryostat SCU Workshop/RAL/UK, April 28-29

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. SCU Workshop/RAL/UK, April 28-29

19WANG,Li/SINAP SCU Workshop/RAL/UK, April 28-29