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MICE/Muool Coupling Magnets Progress

MICE/Muool Coupling Magnets Progress. 2008-10-21 Li Wang for MICE Group Institute of Cryogenics and Superconductivity Technology Harbin Institute of Technology, Harbin, China. Recent Progress. Progress since CM21 at Daresbury in June 2008:. Test coils

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MICE/Muool Coupling Magnets Progress

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  1. MICE/Muool Coupling Magnets Progress 2008-10-21 Li Wang for MICE Group Institute of Cryogenics and Superconductivity Technology Harbin Institute of Technology, Harbin, China

  2. Recent Progress Progress since CM21 at Daresbury in June 2008: • Test coils • Winding of large test coil: to be done around Oct.25th • Fabrication of quench protection assembly for large coil: to be done by Oct.25th • Tests for SC joint soldering strength, SC wire bending radius: done • Cryo-test system: • Test dewar for diodes: done • Large cryostat: under fabrication • Small cryostat: done • Cryo-valves & bayonets, transfer lines: under assembly • Updated design of MICE/MuCool coupling magnets • Cold mass assembly, drop-in mode cryocooler, cold mass support assembly, heat shields, vacuum chamber, etc.: under going

  3. Test Coils • Test coils • Due to relatively high magnetic field (peak field above 7.4T in the coil), largest diameter of the coil in MICE (ID 1.5m), high strain and stress in the coupling coil, two test coils were designed and fabricated in order to validate design methods and winding skills, and to practice the worst case in the coupling coil. The test coils will be powered to a higher current than 210A and The 2nd test coil will be cooled down using the ICST refrigerator in a cryostat suitable for the training the large test coil and the coupling magnets. • Small coil: 350mm x 285 mm, 20 layers, 166 turns/layer, 500 A • To test and debug the winding machine and the wire tension device, to validate the winding skills such as wet lay-up winding technology, layer-to-layer transition, quench protection lead bringing out, welding, elec-insulating and winding of SC splices, to produce enough field so that the magnet can be used for cold diode tests and other sorts of tests to be done in a magnetic field at 4.2 K. • Large coil: a full diameter but one-quarter long prototype coil, 96 layers, 42 turns/layer, 350 A • To be expected to be tested under the equivalent or greater strain state than the coupling coil would encounter during cool down and in magnetic field,to be performed a full scale test of the coupling coil cold diode and resistor quench protection system with the test coil sub-divided into four circuits,to test the SC joint soldering technique, to gain training process experience etc.

  4. Basic Parameters

  5. Load Lines 575A 401A 210A

  6. Small Coil The small coil winding, welding of its cold mass assembly and the cryostat construction for its cryo-test have been done around this June. The connection to the cryo-test system is expected to be finished around the middle of this Nov. ～DN600*1500 Bayonets Vacuum vessel Cooling tubing Power leads Small coil

  7. Large Coil Winding • The winding procedure was approved by LBNL around the middle of this Sept. • The large coil winding started on Sept.20th and will be finished around Oct.25th. • There are 4 SC splices in the coil, and 4-sectioned cold diode and resistor quench protection system is applied. The fiberglass cloth is wrapped every 12 layers of SC wires. The Catalyst 23LV (low viscosity) is used.

  8. Quench Protection Assembly for Test Coils For small coil, 2-section of quench protection circuit consisting of cold diodes and resistors is to be applied. For large coil, 4-section is to be used. The resistor is sized as 6mΩ. The quench protection assembly is under fabrication. QPAssembly for large coil

  9. Tests for SC Joints • There will be 11~12 SC splices in one coil. • The up-down overlap joint with 96Sn-3.5Ag-0.5Cu soft solder is to be applied at the ends of the large test coil and the coupling coils. • The resistance per splice made by ICST has been tested < 5 n even under the magnetic field of 5T at 4.2K. • The SC splice tensile strength was tested at LN2 temperature, which is >500MPa. Up-down joints Test facility

  10. The tensile test results of SC wires at 300 K • The tensile test results of SC splices at 300 K • The tensile test results of SC splices at 77 K

  11. Large coil Small coil MuCool/MICE coils Cryo-Test System • To provide the cooling capacity at 4.2K for performance tests of test coils and MICE/MuCool coils • It mainly consists of the TCF20s refrigerator, 500L LHe dewar, control valve box, cryostats for test coils and MuCool/MICE coils, transfer lines, GHe recovery/purification/storage system, vacuum pumping system etc. • Most parts have been fabricated, and are under assembly. • 500L LHe has been filled into the 30m3 GHe tank on Oct. 10th. • The cryo-test system is expected to be ready for coil test around the middle of this Nov.

  12. Cryo-valves Control valve box

  13. Large cryostat was contracted out at the early of this Sept., and is scheduled to be done at the end of Oct. Bayonets Power leads ～DN2100*1500 304 S.S. Large cryostat QPAssembly for large coil Φ1500/MICE/MUCOOL coil

  14. Transfer lines

  15. Due to high magnetic field of the coupling coil, performance (such as forward voltage etc.) of cold diodes at low temperature and at high magnetic field (2~3T) must be tested in order to design quench protection circuit, charging and fast discharging system before they are installed inside the magnet. The test at low temperature is planned by the end of Oct. Test dewar for diodes

  16. Updated Design of MICE/MuCool Coupling Magnets • Cold mass supports • The cold mass support will be a double-band type considering 500kN force in the longitudinal direction at the worst case, 2g~3g shipping load in any direction, heat leak restriction, and available space inside the cryostat. • Vacuum chamber of cryostat • The design of the outer vacuum chamber of magnet cryostat and warm end connections of cold mass supports will be modified according to final double-band structure of cold mass supports and RFCC module interface. • Drop-in mode cryocoolers and cooling connections • The drop-in mode cryocoolers are to be adopted for the coupling magnets considering easy assembly and disassembly during long distance transportation, and cooler maintenance. • The cooling connections between the cold heads of the coolers and the current leads, and between the cold heads and the heat shields have to be updated accordingly.

  17. Double-band support design Drop-in mode cryocoolers and cooling connections

  18. Cold mass assembly Original design New design In order to mount the strong cold mass support bases, to reduce the possibility of SC wires damaged by cold mass welding process, and to provide space for mounting 8-section quench protection diodes and resistors etc., the cold mass assembly design of the coupling magnet is to be updated, as well as the quench protection assembly.

  19. WBS for Test Coils and the MuCool Coil • Large test coil windingBy 10/25 • Performance test for diodes at low temp. By 10/31 • Fabrication of test cryostat for large coil By 10/31 • Construction of test station for small coil By 11/15 • Assembly of large coil cold mass By 11/22 to weld cover plate/cooling tubing/helium vessel, leakage check, to install quench protection circuit and instrumentation, etc. • Cryo-test for large coilExpected to start on 11/24 • To update design of MuCool/MICE coupling magnets By 11/30 • Review on test coils and updated design of MuCool/MICE coupling magnets 12/06 to 12/08

  20. Fabrication of MuCool coil mandrel By 01/05/09 • Winding of MuCool Coil By02/28/09 • Assembly of MuCool coil cold mass By03/31/09 to weld cover plate/cooling tubing/helium vessel, leakage check, to install quench protection circuit and instrumentation, etc. • Cryo-test of MuCool coil cold mass By04/30/09 • Assembly of MuCool magnet cryostatBy 07/09/09 • Cryo-test of MuCool magnet By 07/31/09 • Two MICE magnets By 12/31/09 Status of Funds • HIT has provided 1.5 million Yuan (RMB)funding for the MICE CC project till this July, which was spent on construction of two test coils and cryo-test system, and will be used for fabrication of the MuCool coupling magnet. • ICST will submit another ~1.0 million Yuan (RMB)funding application proposal to the HIT for fabrication of two MICE magnets at the early of 2009.

  21. Click to edit company slogan . Thank You ! Icst.hit.edu.cn

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