MUTAC Review, 9 April 2008 1 MuCOOL and MICE Coupling Magnet Status Michael A. Green Lawrence Berkeley Laboratory Berkeley CA 94720.
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MUTAC Review, 9 April 2008 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 De-spooling and Tensioning Apparatus Coil Winding 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 Coil Small PrototypeCoupling 96 layer 24 layer12 layer96 layer80 layer Coil Length (mm)285 72 285 Coil Inner Radius (mm)175 750 Coil Thickness (mm)25.512.8102.585.4102.5 Number of Layers2412968096 No. Turns per Layer166 42 166 Magnet J (A mm-2)*114.6 Magnet Current (A)*210 Self Inductance (H)4.5291.1150.05935.88592.5 Peak Induction in Coil (T)2.791.433.913.567.44 Magnet Stored Energy (KJ)99.86724.41104791.213069 4.2 K Temp. Margin (K)~3.3~3.9~2.5~2.9~0.8 Conductor Len/coil (km)4.7012.2720.29916.735~ 80.118 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 9 Magnetic Field in the Small Test Coil at a Current of 512 A
MUTAC Review, 9 April 2008 10 After cooling to 4.2 K After charging to 512 A Von Mises Stress of the Small Test Coil after Cool Down and Charging at 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 Winding After Coil Banding After Cool Down to 4 K After Charge to 401 A
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 Winding banding Cooling Charging Winding coil Von Mises Stress in the Coupling Coil 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. 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. T = 0.074 K
MUTAC Review, 9 April 2008 16 Parameter 0 m 60 m 2-Section Hot Spot Temperature (K)136 Max Internal Voltage (V)60436006 4-Section Hot Spot Temperature (K)129 Max Internal Voltage (V)31123074 6-Section Hot Spot Temperature (K)127126 Max Internal Voltage (V)20772043 Parameter 0 5 8-Section Hot Spot Temperature (K)13588 Max Internal Voltage (V)26691391 Results for Test Coil 2 Results for Coupling Coil A Summary of Quench Protection Simulations for the 2nd Test Coil and the 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 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.