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Muon Cooling Channel Superconducting Magnet System V.S. Kashikhin, FNAL Meeting on May 16, 2006

Muon Cooling Channel Superconducting Magnet System V.S. Kashikhin, FNAL Meeting on May 16, 2006. Magnet System Parameters. Single helical conductor: Jz = Jn*cos[(n(teta-k*z)] Jteta = Jz/tan(alpha) = Jn*k*alpha*cos[n(teta-k*z)]. Maximum solenoidal field at z = 0 - 4.4 Tesla

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Muon Cooling Channel Superconducting Magnet System V.S. Kashikhin, FNAL Meeting on May 16, 2006

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  1. Muon Cooling ChannelSuperconducting Magnet System V.S. Kashikhin, FNAL Meeting on May 16, 2006

  2. Magnet System Parameters Single helical conductor: Jz = Jn*cos[(n(teta-k*z)] Jteta = Jz/tan(alpha) = Jn*k*alpha*cos[n(teta-k*z)] Maximum solenoidal field at z = 0 - 4.4 Tesla Minimum solenoidal field at z = 4 m - 2.2 Tesla

  3. 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 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

  4. 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

  5. Helical Dipole, Quadrupole, Sextupole All Helix Coils have length 1 m 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.

  6. Summary • Superconducting magnet system is feasible • Short sections approach is a reasonable way of system manufacturing • Beam inlet and outlet areas should be magnetically shielded • 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

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