Harold G. Kirk Brookhaven National Laboratory Meson Production Efficiencies IDS Target Meeting CERN December 17, 2008.

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Presentation transcript:

Harold G. Kirk Brookhaven National Laboratory Meson Production Efficiencies IDS Target Meeting CERN December 17, 2008

Harold G. Kirk Proton Driver Parameters Proton driver power: 4 MW Proton driver repetition rate: 50 Hz Proton energy: around 10 GeV 3 proton bunches in train l 1.7×10 13 protons per bunch at 10 GeV Bunch length 1 – 3 ns Train length at least 200 μs

Harold G. Kirk The Neutrino Factory Target Concept

Harold G. Kirk The Target/Collection System Count all the pions and muons that cross the transverse plane at z=50m. For this analysis we select all pions and muons with 40 < KE< 180 MeV.

Harold G. Kirk 50GeV Beam-Mesons at 50m 40MeV<KE<180MeV

Harold G. Kirk Mesons at 50m Mesons/ProtonMesons/Proton normalized to beam power ISS Results reported April, 2006

Harold G. Kirk Hg Jet Target Geometry Previous results: Radius 5mm, θ beam =67mrad Θ crossing = 33mrad

Harold G. Kirk Step 1: Vary the Target Radius Rmax=0.48cm

Harold G. Kirk Step 2: Vary the Beam Angle  beam =89mrad

Harold G. Kirk Step 3: Vary the Beam/Jet Crossing Angle  crossing =25mrad

Harold G. Kirk Optimized Target Parameters Target Radius Proton Beam Angle

Harold G. Kirk Beam/Jet Crossing Angle

Harold G. Kirk Meson Production Normalized to Beam Power

Harold G. Kirk Process mesons through Cooling Consider mesons within acceptance of ε ┴ = 30π mm and ε L = 150π mm after cooling 180 MeV

Harold G. Kirk Compare 50m to Post-Cooling

Harold G. Kirk Summary l Peak meson production efficiency for a Neutrino Factory Hg Target system occurs in the region of 6 to 10 GeV l At 20 GeV we have a 10% loss in efficiency l At 40 GeV we have a 20% loss in efficiency l At 80 GeV we have a40% loss in efficiency

Harold G. Kirk Backup Slides

Harold G. Kirk Optimizing Soft-pion Production

Harold G. Kirk Post-cooling 30π Acceptance