Beam dump for J-Parc neutrino facility

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Beam dump for J-Parc neutrino facility
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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
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Thickness required for radiation shielding
Top View
The amount and shape of iron should be optimized.
Front View
Side View
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Heat load from radiation
At x0 plane
unit J/cm3/pulse
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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
-gt need aluminum plate or something in
concrete 54oC
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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.