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MuCOOL and MICE Coupling Magnet Status

This review provides updates on the progress of the MuCOOL and MICE coupling magnet project, including the status of the coil winding, fabrication, and testing processes.

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MuCOOL and MICE Coupling Magnet Status

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  1. MuCOOL and MICE Coupling Magnet Status Michael A. Green Lawrence Berkeley Laboratory Berkeley CA 94720 MUTAC Review, 9 April 2008

  2. The ICST Coupling Solenoid Design Coupling Magnet Cryostat Coupling Magnet Cold Mass MUTAC Review, 9 April 2008

  3. Magnet Progress to Date • A portion of the superconductor has been delivered. The rest of the conductor is being fabricated. • Engineering design of the coupling magnet is over 90 percent complete. • The engineering design of the two ICST test coils is complete. • The coil winding tooling is complete. • The first dummy test coil is being wound at ICST. • The first test coil joints have been fabricated. The joints will be tested in a magnetic field at Berkeley. MUTAC Review, 9 April 2008

  4. ICST Coil Winding Facility Coil Winding Apparatus De-spooling and Tensioning Apparatus Winding a Copper Test Coil MUTAC Review, 9 April 2008

  5. Purpose of Test Coil 1 • This coil is the first superconducting solenoid wound with the coupling coil conductor. • The joint design and the coil taps for the quench protection system is verified in this magnet. • This coil will be part of the crew training process. • Test coil 1 will 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 300 K, 77 K and 4.2 K. • Both of the superconducting test coils will be cooled using the ICST refrigerator. MUTAC Review, 9 April 2008

  6. Purpose of Test Coil 2 • The winding parameters for the coupling coil will established by winding a full diameter test coil. • 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. • Test coil 2 will be strained by the cool down and the magnetic field so that the worst case strain seen by the MICE coupling coils is seen in the test coil. • There will be a full scale test of the coupling coil cold diode and resistor quench protection system with the test coil sub-divided into four circuits. MUTAC Review, 9 April 2008

  7. Parameters for the Test Coils and the Coupling Coil The small test coil will have 24 layers. The large prototype test coil will have 96 layers. MUTAC Review, 9 April 2008

  8. Magnet Load Lines MUTAC Review, 9 April 2008

  9. Magnetic Field in the Small Test Coil at a Current of 512 A MUTAC Review, 9 April 2008

  10. Von Mises Stress of the Small Test Coil after Cool Down and Charging at 512 A After cooling to 4.2 K After charging to 512 A MUTAC Review, 9 April 2008

  11. Magnetic Field in the Large Test Coil at a Current of 401 A MUTAC Review, 9 April 2008

  12. Von Mises Stress in the Large Test Coil After Coil Banding After Coil Winding After Charge to 401 A After Cool Down to 4 K MUTAC Review, 9 April 2008

  13. Stress and Deflection Simulations for the 2nd Test Coil (the full diameter test coil) • Stress and deflection simulations were done on the large test coil. Stress and deflection calculations were done after the magnet was cooled to 4.2 K and powered to 401 A. • The hoop stress and Von Mises stress is almost the same for the large test coil at 401 A when compared to the coupling coil at 210 A. The radial deflection is also similar. If the large test coil can operate at 400 A, the coupling coil should operate to at least 200 A. MUTAC Review, 9 April 2008

  14. Von Mises Stress in the Coupling Coil Winding banding Charging Winding coil Cooling The stress and deflection calculations include the winding pre-stress in the coil and banding, which keeps the coil from lifting off the mandrel when it is fully charged to a current of 210 A. The boundary conditions are different for the coupling coil than they were for the large test coil. The minimum winding Pre-stress is 70 MPa. The aluminum banding pre-stress is 30 MPa. MUTAC Review, 9 April 2008

  15. Modeling the Temperature Distribution in the Coupling Coil during Normal Operation The heat flow into the magnet as shown is 1.5 W from radiation and conduction. DT = 0.074 K The heat flow due to AC losses in the magnet coil during to a rapid discharge from 210 A to no current in 5400 seconds has also been modeled using ANSYS. The coupling magnet can be discharged in 5400 seconds without quenching. MUTAC Review, 9 April 2008

  16. A Summary of Quench Protection Simulations for the 2nd Test Coil and the Coupling Coil Results for Test Coil 2 Results for Coupling Coil MUTAC Review, 9 April 2008

  17. The ICST set up allows the coupling magnet to be trained rapidly to its full current. Refrigerator 1500 mm ID Magnet Coil MUTAC Review, 9 April 2008

  18. ICST MuCOOL Milestones • Complete the large coil test stand 6/15/08. • Complete the two test coils 6/30/08. • Finish winding the MuCool Coil 7/31/08. • Complete the MuCool coil Cold Mass 9/20/08. • Train MuCool coil cold mass assembly 9/30/08. • Finish Mucool magnet assembly 12/02/08. • Mucool magnet acceptance test finished 1/01/09. • Ship Mucool magnet to Fermilab 1/10/09 MUTAC Review, 9 April 2008

  19. ICST MICE Magnet Milestones • Finish winding 1st MICE coil 10/09/08. • Finish and train 1st MICE coil assembly 11/30/08. • Finish winding 2nd MICE coil 12/18/08. • Finish 1st MICE magnet assembly 2/09/09. • Finish and train 2nd MICE coil assembly 2/17/09. • 1st MICE magnet acceptance test finished 3/02/09. • Ship 1st MICE magnet to LBNL 3/15/09. • Finish 2nd MICE magnet assembly 4/28/09. • 2nd MICE magnet acceptance test finished 5/29/09 • Ship 2nd MICE magnet to LBNL 6/10/09. MUTAC Review, 9 April 2008

  20. Concluding Comments • The coupling magnet engineering is nearly done, but there may be a few changes in the final design based on what is learned from the two test coils. • The schedule for the Mucool and MICE magnets is based on things going well. The schedule doesn’t consider unforeseen problems that may be encountered when the MuCool magnet is run with the 1.5 W coolers for the first time. MUTAC Review, 9 April 2008

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