Progress on the MICE Cooling Channel Solenoid Magnet System
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1 Progress on the MICE Cooling Channel Solenoid Magnet System M.A. Green, S. Q. Yang,G. Barr, U. Bravar, J. Cobb W. W. Lau, R.S. Senenayake, H. Witte, A. E. WhitePhysics Department, Oxford University, UKD. Li and S. P. VorostekLawrence Berkeley Laboratory, Berkeley USA
2 Outline Introduction of MICE Cooling Channel MICE Absorber Focusing Coil moduleThe Focusing Magnet DesignFEA Models of the Focusing magnetMICE RF and Coupling Coil moduleThe Coupling Magnet designFEA Models of the Coupling MagnetTasks Completed and Tasks to DoConclusion
3 Focusing and Coupling Magnet Reports M. A. Green and S. Q. Yang, “Heat Transfer into and within the 4.4 K Region and the 40 K Shields of the MICE Focusing and Coupling Magnets” Oxford University Physics Report, 28 April 2004M. A. Green and R. S. Senanayake, “The Cold Mass Support System for theMICE Focusing and Coupling Magnets,” Oxford University Physics Report, 23 August 2004M. A. Green and S. Q. Yang, “The Coil and Support Structure Stress and Strain the MICE Focusing and Coupling Magnets,” Oxford University Physics Report, 30 August 2004M. A. Green, “Cooling the MICE Magnets using Small Cryogenic Coolers,” Oxford University Physics Report, 10 September 2004S. Q Yang, M. A. Green, G. Barr, et al, “The Mechanical and Thermal Design for the MICE Focusing Solenoid Magnet System,” submitted to IEEE Transactions on Applied Superconductivity 15, (2005), submitted 5 Oct. 05M. A. Green, S. Q. Yang, U. Bravar, et al, ““The Mechanical and Thermal Design for the MICE Coupling Solenoid Magnet,” submitted to IEEE Transactions on Applied Superconductivity 15 (2005), submitted 5 Oct. 05
9 AFC Magnet Cross-section Focusing MagnetCold Mass SupportMagnet Coil and Absorber Cross-section
10 The Basic Parameters of the Focusing Magnet in the Non-flip and the Flip Mode Coil Separation (mm)200Coil Length (mm)210Coil Inner Radius (mm)263Coil Thickness (mm)84Number of Layers76No. Turns per Layer127Magnet J (A mm-2)*71.96138.2Magnet Current (A)*130.5250.7Magnet Self Inductance (H)137.498.6Peak Induction in Coil (T)*5.047.67Magnet Stored Energy (MJ)*220.127.116.11 K Temp. Margin (K)*~2.0~0.5Inter-coil Z Force (MN)*-0.563.40* Design based on p = 240 MeV/c and beta = 420 mm.
11 The Focusing Magnet Load Lines and Conductor Current Versus the Magnetic Induction at Various Conductor TTM = 0.5 KTM = 2.0 K
12 Focusing Magnet DT, Cooling along One Line Local region applied 4.3KDT = 1.08 KThe focus magnet is attached to the cooler along a 100 mm wide strip that is at 4.3 K.The radiation heat load on all other surfaces QR = 1.0 W m-2.The maximum DT = 1.08 K
13 Focusing Magnet DT, Outside Cooling The heat flux on the inner cylindrical surface and the ends is 1 W m-2; the outer cylindrical surface is at 4.3 K.The maximum DT = K
14 Magnet connection to the Cooler with a Liquid Helium Cold Pipe T2 - T1 < 0.1The superconducting coils for the MICE focus magnets will be cooled by conduction from liquid helium in a space on the outside of the magnet coils. A simple gravity feed heat pipe supplies cold liquid from the helium condenser to the bottom of the magnet. The boil off gas is re-liquefied on a condenser surface and the condense liquid helium is sent back to the bottom of the magnet helium tank
15 Focusing magnet Stress and Deflection due to the Cool Down The results show the Von Mises Stress, Radial Deflection (negative y direction) and Longitudinal Deflection (z direction) due to cooling the Focusing Magnet Module from Room Temperature to 4.2 K.
16 Focusing magnet Stress and Deflection due to the Cool Down and Magnetic Forces The results show the von mises stress, the radial (the Y direction) and longitudinal (the Z direction) deflections, for the focusing magnet module that has been cooled from room temperature to 4.2 K, and the coils are powered for as in the baseline full-flip case with a muon beam with an average momentum of 240 MeV/c.
18 MICE: RF and Coupling module Coupling MagnetCavity RF CouplerDished Be WindowRF Cavity CellModule Vacuum VesselVacuum PumpMagnet Vacuum Vessel2D view of the RF and Coupling ModuleThree quarter section 3D View of RF module
20 Relationship of the Coupling Coil to the Cavity Be WindowCavity Coupler201 MHz RF CavityVacuum PumpThe coupling coil length is determined by the position of the RF couplers.
21 The Basic Parameters of the Coupling Magnet in the Non-flip and the Flip Mode Coil Length (mm)250Coil Inner Radius (mm)725Coil Thickness (mm)116Number of Layers104No. Turns per Layer151Magnet J (A mm-2)*104.9115.5Magnet Current (A)*193.6213.2Magnet Self Inductance (H)563Peak Induction in Coil (T)*7.097.81Magnet Stored Energy (MJ)*10.612.84.2 K Temp. Margin (K)*~0.9~0.6* Design based on p = 240 MeV/c and beta = 420 mm.
22 The Coupling Magnet Load Lines and Conductor Current Versus the Magnetic Induction at Various Conductor TTM = 0.6 KTM = 0.9 K
23 entire outside surface a) Cooling at one point on Temperature Distribution on the Coupling Coil as a Function of Cooling LocationCooling on theentire outside surfaceQR = 1.0 W m-24.3 K4.568 KDT = Ka) Cooling at one point onthe outside surfaceQR = 1.0 W m-24.3 KDT = K
24 Cooler Circuit for the Coupling Magnet The heat pipe reducesT2-T1 to < 0.1 K.See page 23 for reductionT3-T2 within the coil.T3-T0 is ~ 0.2 KThere is no copper strapbetween the cooler andthe magnet.
25 Coupling Magnet Stress and Deflection due to the Cool Down and Magnetic Forces The results show the von Mises stress, the radial (the Y direction) deflection,for the coupling magnet cooled from 300 K to 4.2 K, and the coils are poweredfor the full-flip case with a muon beam with a momentum of 200 MeV/c.
26 Tasks Completed and Tasks to Do FocusingCouplingBasic Coil Design based on a ConductorYesTemperature Distribution in MagnetStress and Deflection in MagnetCold Mass Support System DesignCooler Selection and Hook Up DesignQuench Protection System DesignDec 2004Engineering Completed for a RFP*April 2005June 2005Specifications for the RFP*Safety Documentation for RFP*Sept. 2005Power Supply Specification** Based on developing a performance specification (not build to print)
27 Other Magnet Related Tasks to Do Complete and check the cold mass support force calculations for all relevant cases. Partly DoneCheck the worst cases forces to be encountered during a magnet quench. Partly DoneDetermine if a quench of one magnet in MICE can will cause other magnets to quench inductively.Design the copper current leads from 300 K to 50 K for currents of 300 A and 60 A. Partly DoneSelect the 300 A and 50 A HTS leads. Partly Done
28 ConclusionsMost of the relevant design calculations have been done for the focusing and coupling magnets.Most of the relevant calculations have been done to allow the magnets to be cooled by small coolers.The 2D and 3D Drawings of the entire channel are beginning to come together.More work must be done a quench calculations.The RFP specifications for the magnets and magnet subcomponents need to be written.The magnets must be looked at for safety hazards.