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Study of Helical Cooling Channel for Neutrino Factory

Study of Helical Cooling Channel for Neutrino Factory. K. Yonehara. Concept of Helical Cooling Channel (HCC). Incident Muon Beam. Combined function magnet (invisible in this picture) = Pure solenoid + Helical dipole + Helical quadrupole. Evacuated Dipole magnet. Red: reference orbit

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Study of Helical Cooling Channel for Neutrino Factory

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  1. Study of Helical Cooling Channel for Neutrino Factory K. Yonehara HCC for NF, 8/19/09

  2. Concept of Helical Cooling Channel(HCC) Incident Muon Beam Combined function magnet (invisible in this picture) = Pure solenoid + Helical dipole + Helical quadrupole Evacuated Dipole magnet Red: reference orbit Blue: beam envelop Wedge absorber Incident Muon Beam H2 gas absorber in Dipole magnet • Dispersive component makes longer (shorter) path • length for higher (lower) momentum particles • → Continuous emittance exchange • Homogeneous field (no periodic structure) makes • minimal resonant losses • This fact makes large phase space acceptance Emittance exchange 4 HCC for NF, 8/19/09

  3. Initial thoughts • HCC acceptance • 20 mm rad or more in transverse • 20 mm in longitudinal • Chris gave me the numbers for NF; • 30 mm rad (fine) • 150 mm (Ops! It’s too long!) • Cooling factor 2~3 for each direction • Anyway, let us test an HCC for NF HCC for NF, 8/19/09

  4. Conventional cooling channel in study2a beam line HCC for NF, 8/19/09

  5. Additional thoughts • GHe may work instead of using GH2 • 35~40 MV/m will be available at 200 atmGHe Maximum electric field gradient in dense hydrogen gas filled RF cavity HCC for NF, 8/19/09

  6. HCC parameter list • GHe pressure = 200 atm at room temperature • Peak field Erf = 20 MV/m will be sufficiently lower than the • breakdown field at p = 200 atm • Assume that RF is integrated into helix magnet Dielectric loaded RF cavity Helical magnet structure Dielectric loaded helical RF or NF, 8/19/09

  7. Simulation result • Transverse cooling factor 4 at z = 48 m • Transverse acceptance is 20 mm rad • Longitudinal cooling factor 1.5 at z = 48 m • Longitudinal acceptance is 25 mm • Just ignore the point at z = 0 m, that point would be lead by mismatching HCC for NF, 8/19/09

  8. Conclusion • Initial transverse phase space is acceptable for HCC • Initial longitudinal phase space is too long for HCC • Rearrangement of initial phase space is needed if we use HCC for Neutrino Factory • GHe works pretty well • Transverse cooling factor 4 and longitudinal cooling factor 1.5 at 48 meters, respectively HCC for NF, 8/19/09

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