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Muon Cooling Channel Design

Muon Cooling Channel Superconducting Magnet Systems Muon Collider Task Force Meeting on July 31, 2006 V.S. Kashikhin. Muon Cooling Channel Design. K. Yonehara - Muon Beam Cooling Simulations V.V. Kashikhin - Helix Dipole + Solenoid V.S. Kashikhin - Helix Solenoid

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Muon Cooling Channel Design

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  1. Muon Cooling ChannelSuperconducting Magnet SystemsMuon Collider Task Force Meeting on July 31, 2006V.S. Kashikhin

  2. Muon Cooling Channel Design • K. Yonehara - Muon Beam Cooling Simulations • V.V. Kashikhin - Helix Dipole + Solenoid • V.S. Kashikhin - Helix Solenoid • I. Novitski - Mechanical Design • M. Kuchler - Cryostat conceptual design • A. Zlobin - Quench protection • N. Andreev - Design and manufacturing issues

  3. Magnet System Parameters Maximum solenoidal field at z = 0 - 4.4 Tesla Minimum solenoidal field at z = 4 m - 2.2 Tesla • Two magnet system versions under consideration: • Large Bore Solenoid + Helical Dipole + Helical Quadrupole • Helix Solenoid + Correction Coils

  4. Superconducting Solenoid LHC Cables parameters: Inner cable 14 kA at 7 T & 4.2 K Outer cable 8.5 kA at 7 T & 4.2 K LHC short samples: Jc = 2750 A/mm2 at 5 T & 4.2 K LHC cables leftover: Inner cable - 1400 m Outer cable - 2660 m • Solenoid has 8-12 sections wound separately on identical bobbins • All sections connected in series • Ferromagnetic end plates improve ends field quality • Holes in end plates provide path for muon beam inlet and outlet • Needed coil mechanical stability provided by SS or Al bandage

  5. Solenoid Magnetic Field Flux lines of solenoidal field Specified linear solenoidal field decay along Z axis provided by proper chosen number of turns for each section: W1= 243 W5 = 136 W2 = 184 W6 = 126 W3 = 158 W7 = 114 W4 = 147 W8 = 114 Solenoid flux density distribution, Bmax = 5 Tesla

  6. Helical Dipole, Quadrupole, Sextupole Shell type Helix Coils have length 1,2,3 and 4 meters and wound one after other. They will be epoxy impregnated together. Support cylinder will provide mechanical stability. Because of relatively low field decay 1 m long sections will be enough for proper field approximation.

  7. Helical Dipole + Solenoid Red – Sectional Large Bore Solenoid Blue –Helical Dipole, several shell type dipoles with different length for field decay

  8. Helical Dipole+Solenoid Solenoid maximum field 7.2 Tesla Inner bore diameter 1 meter Number of solenoid sections - 12 Number of dipole sections - 4

  9. Helical Dipole + Solenoid Only first sections in high field area Half solenoid has less than 4 Tesla field

  10. Helical Dipole + Solenoid Good agreement with analytical field used by K.Yonehara for beam cooling simulation

  11. Helical Solenoid Helical Solenoid: Small bore diameter 0.5 m Helix period 1.6 m Number of coils 73 Coil width 50 mm Outer helix diameter 1 m Max coil current 201 kA

  12. Helical Solenoid Fields Field at radius 0.49 m Field at center orbit radius 0.255 m Max field 4.3 T

  13. Helical Solenoid Fields Field at 0.255 m radius with helix period 1.6 m

  14. Helical Solenoid Quadrupole Field Period 1.6 m, G=-0.83 T/m, dG/dz=-0.11 (T/m)/m Helix Solenoid Gradient Period 1.4 m, G=-1.0 T/m K. Yonehara, AD Meeting July 27, 2006 Kappa = 0.8, Helix period = 2 m, G = -0.8 T/m Kappa = 1.0, Helix period = 1.6 m, G=-0.83 T/m Kappa = 1.15, Helix period = 1.4 m, G=-1.0 T/m Specified dG/dz = -0.1 T/m

  15. Summary • Both superconducting magnet systems are feasible • Short sections approach is a reasonable way of system manufacturing • Beam inlet and outlet matching areas should be investigated • Values of operating currents and current leads number should be optimized • Superconducting test of separate sections is an economic way to control • whole system performance and reduces the risk • Labor of helical coils fabrication is relatively large. Configuration and number of coil sections should be optimized • Mechanical structure should be capable to withstand large Lorentz forces • Magnet cryogenic system should provide effective cooling at 4.2-4.5 K • Active quench protection system should be used to protect magnet system

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