Beam dump for J-Parc neutrino facility

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Presentation transcript:

Beam dump for J-Parc neutrino facility

Requirement For the 1st phase: accept 0.75 MW beam For the 2nd phase : accept 4MW beam Heat Load Among total beam power, 20% is deposited at dump. Radiation shielding 11mSv/h at the boundary of concrete and soil 0.25mSv/h at the surface of soil Muon Monitor monitor the direction and intensity of the beam

Thickness required for radiation shielding Top View The amount and shape of iron should be optimized. Front View Side View

Heat load from radiation At x=0 plane unit: J/cm3/pulse

Example of Heat Analysis(4MW) ½ Model Boundary condition (All) outer surface of the iron is cooled by water. concrete Temperature distribution in Iron beam iron soil Result Max. in iron : 700oC -> need aluminum plate or something in concrete : 54oC

Muon monitor Monitoring of the beam direction and intensity. Threshold 8 GeV/c ? Probably 5 GeV/c is preferable… (under study) To achieve 5 GeV/c threshold, the monitor has to be installed between irons under high radiation condition.