Harold G. Kirk Brookhaven National Laboratory Target Baseline IDS-NF Plenary CERN March 23-24, 2009.

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Presentation transcript:

Harold G. Kirk Brookhaven National Laboratory Target Baseline IDS-NF Plenary CERN March 23-24, 2009

Harold G. Kirk The Neutrino Factory Target Concept

Harold G. Kirk Iron Plug Proton Beam Nozzle Tube SC-1 SC-2 SC-3SC-4 SC-5 Window Mercury Drains Mercury Pool Water-cooled Tungsten Shield Mercury Jet Resistive Magnets Neutrino Factory Study 2 Target Concept ORNL/VG Mar2009 Splash Mitigator Path toward a Target System Design

Harold G. Kirk Alternative Collection System Another containment approach includes a shortened Hg container Drain lines exit cryostat between SC-3 and SC-4 This would trap container in the cryostat, preventing future replacement

Harold G. Kirk The Hg Jet Nozzle Nozzle performance: The Issue

Harold G. Kirk The Jet/Beam Dump Interaction T. Davonne, RAL

Harold G. Kirk Fluka Simulation - Energy deposition in mercury pool with 24GeV beam How much of the beam energy is absorbed in the beam dump? T. Davonne, RAL

Harold G. Kirk Eruption of mercury pool surface due to 24GeV proton beam Autodyne simulation Splash following pulse of 20Terra protons

Harold G. Kirk Splash Mitigation Study 2 assumed a particle bed of tungsten balls to minimize effects of jet entering pool Many other feasible concepts to accomplish this function Simulation/analytical studies may be useful to limit options Pool circulation and drainage locations also need to be studied Prototypic testing needed for comparison & final determination

Harold G. Kirk Containment Design Requirements Material compatible with high-field magnets l Must also withstand some number of full-power beam pulses with no Hg in vessel (accident scenario) Desire no replaceable components Provide support for Hg weight l ~220 liters, 3 metric tons Sloped (1°-2°) for gravity drain Overflow drain for 20m/s jet (1.6 liter/s) Vent for gas transfer

Harold G. Kirk Toward a Target Prototype l Esatablish a coherent, engineered design concept l Design and test an improved nozzle l Design an Hg handling system l Design and test a CW Hg delivery system l Design, fabricate and beam test a target prototype

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

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 Fixed Parameters: R=5mm; Beam Angle=67mrad; Jet/Beam = 33mrad

Harold G. Kirk Vary the Target Radius

Harold G. Kirk Optimized Target Radius 2 to 100 GeV

Harold G. Kirk Beam Angle and Jet/Beam Crossing Angle Beam Angle Crossing Angle

Harold G. Kirk Mars14 vs Mars15 Comparison

Harold G. Kirk Normalized to Beam Power

Harold G. Kirk Normalized to Peak

Harold G. Kirk Summary l Peak meson production efficiency for a Neutrino Factory Hg Target system occurs in the region of 6 to 8 GeV l At 20 GeV we have a 25% loss in efficiency l At 40 GeV we have a 45% loss in efficiency l At 80 GeV we have a 50% loss in efficiency

Harold G. Kirk Backup Slides

Harold G. Kirk Optimized Target Parameters Target RadiusBeam Angle Beam/Jet Crossing angle

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 Step 1: Vary the Target Radius Rmax=0.48cm

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 Optimizing Soft-pion Production

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 Post-cooling 30π Acceptance