BEER cave design and shielding STAP meeting – Phase 2

Change in the cave design TG2 design revisited Lift – dead high about 50 cm Detectors – movable only two, rearrangement Personal access – stairs position Cabinets – moved to E02

New cave design Cave construction from cast concrete Hutch – LYCOS panel system 3.8 m behind hutch asked by ESS SE and big samples access via shaft Short path between prep. lab and cave 4 ton crane in the cave Future installation of the lift possible Personal access 3.8 m SE access

New cave design – roof entry

New cave design

New cave design

Guide shielding calculation Neutron guide shielding Fast neutron after the bunker Rest of the guide tunnel 10 m after bunker Shutter design

Guide shielding calculation Criteria of 1.5 μS/h at the surface is met Spatial neutron dose rate distribution Spatial gamma dose rate distribution

Cave shielding Simulation made for 55 cm of std. concrete Plan for boron addition in the concrete or paint inside the cave Criteria of 1.5 μS/h at the surface is met for H1 scenarios H2 scenario – active solution or additional shielding

Cave shielding Calculation for 0.1 cm3 of Mn in the beam (H1 scenario) Beam size 1x1 cm2, chopper stopped in open position Spatial neutron dose rate distribution Spatial gamma dose rate distribution

Cave shielding Calculation for 1 cm3 of H2O in the beam (H1 scenario) Beam size 1x1 cm2, chopper stopped in open position Spatial neutron dose rate distribution Spatial gamma dose rate distribution

Cave shielding Calculation for 1 mm of Cd plate in the beam (H2 scenario) Beam size 10x10 cm2, chopper stopped in open position Spatial neutron dose rate distribution Spatial gamma dose rate distribution