1. BEER cave design and shielding
STAP meeting – Phase 2

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

3. 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

4. New cave design – roof entry

5. New cave design

6. New cave design

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

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

9. 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

10. 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

11. 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

12. 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