1. 1 Implementation at RAL Iouri Ivaniouchenkov on behalf of Elwyn Baynham, Tom Bradshaw, Tony Jones, Jim Rochford Engineering Department, RAL MICE Collaboration meeting @ Columbia, 14 June 2003

2. 2 Scope of presentation Magnetic shielding : Latest results from magnetic simulation done by Jim Rochford Layout & Safety: Current status MICE Collaboration meeting @ Columbia, 14 June 2003

3. 3 MICE magnetic field: Conclusion from previous work MICE will produce magnetic field which extends outside experimental hall: Configuration 5 Gauss Line Final MICE R~6800 mm, Z~13400 mm Solenoid mode R~14200 mm, Z~19900 mm Modified solenoid mode R~14900 mm, Z~21000 mm Magnetic simulations are under way. First results show that shielding can be achieved by using steel cladding in the hall. MICE Collaboration meeting @ Columbia, 14 June 2003

4. 4 Coil axis 20 mm 8 m 20 m 3d rectangular model of iron shield 8 m 3d rectangular model of iron shield top half only Coil axis 20 mm 4 m 20 m 3d rectangular model of iron shield extended to ground level 2d axi-symmetric model of iron shield 20 mm r =4 m Coil axis MICE magnetic shield: Models Coil axis 20 mm 6 m 20 m 2 m 8 m

5. 5 MICE Collaboration meeting @ Columbia, 14 June 2003 BH curve for iron as used in the models MICE magnetic shields: Iron

6. 6 MICE Collaboration meeting @ Columbia, 14 June 2003 z R Plot showing flux lines in cylindrical shield B peak =0.82T 5 gauss line is within cylinder wall MICE magnetic shield: Cylindrical shield

7. 7 MICE Collaboration meeting @ Columbia, 14 June 2003 3d model of complete rectangular shield B peak =0.67T MICE magnetic shield: Complete rectangular shield 5 gauss line

8. 8 MICE Collaboration meeting @ Columbia, 14 June 2003 3d model of ½ a rectangular shield B peak =0.93T 5 gauss line MICE magnetic shield: Half of a rectangular shield

9. 9 3d model of a rectangular shield extending to floor B peak =0.82T 5 gauss line MICE magnetic shield: Extended half of a rectangular shield MICE Collaboration meeting @ Columbia, 14 June 2003

10. 10 Peak field in shield for different models MICE Collaboration meeting @ Columbia, 14 June 2003 MICE magnetic shield: Peak field in shield

11. 11 Effect of the presence of the shield on the axis field MICE Collaboration meeting @ Columbia, 14 June 2003 MICE magnetic shield: Effect on the axis field

12. 12 Top Fx=0,Fy=-1470,Fz=0 1470N 150N 1330N Z X Y MICE Collaboration meeting @ Columbia, 14 June 2003 MICE magnetic shield: Forces Sides Fx=(+/-)1330, Fy=-150, Fz=0

13. 13 2d and 3d models agree well Can effectively contain 5 gauss line within hall by using a 20mm thick rectangular shield. Initial calculations of the forces on the shield are small The field has a very small effect on the axis field MICE Collaboration meeting @ Columbia, 14 June 2003 MICE magnetic shield: Summary

14. 14 Magnetic shielding: Cost estimation Structure: 4 wall box 8 m (width) *6 m (height) * 20 m (length) * 20 mm = 11.2 m^3 Material : soft magnetic steel (£600 / tonne) Steel cost: 11.2 m^3 * 7.9 tonne/m^3 = 25.28 tonnes -> £ 15168 (= 21316 Euro = 24965 $US ) Shielding cost = steel cost * 2(3) = £ 30336 (£ 45504) MICE Collaboration meeting @ Columbia, 14 June 2003

15. 15 MICE layout AutoCAD drawing for MICE experimental hall plus ISIS machine hall plus ISIS control room is finished by Tony Jones. Various options for the layout of MICE are being considered. Consultations with ISIS and RAL Safety Officers are under way. MICE Collaboration meeting @ Columbia, 14 June 2003

16. 16 MICE layout: 2D Model MICE Collaboration meeting @ Columbia, 14 June 2003

17. 17 MICE layout: Options MICE Collaboration meeting @ Columbia, 14 June 2003 slope cellar trench 2.3 metres deep 1 m stay clear zone 3.9 m Concrete radiation shielding Steel magnetic shielding services zone 5 m Scale: Option 1 Main gate Exit High level exit beam axis door 6.8 m

18. 18 MICE layout: Options MICE Collaboration meeting @ Columbia, 14 June 2003 slope cellar trench 2.3 metres deep 1 m stay clear zone 3.9 m Concrete radiation shielding Steel magnetic shielding services zone 5 m Scale: Option 2 Main gate Exit High level exit beam axis door 1.6 m 4.8 m

19. 19 MICE layout: Options MICE Collaboration meeting @ Columbia, 14 June 2003 slope cellar trench 2.3 metres deep 1 m services zone 3.9 m Concrete radiation shielding Steel magnetic shielding stay clear zone 5 m Scale: Option 3 Main gate Exit High level exit beam axis door 1.6 m 4.8 m Components transportation: On a moving platform without taking roof off By crane, a part of roof slides off By crane, a part of roof folds up

20. 20 MICE layout: Options 1 m Concrete radiation shielding Steel magnetic shielding Scale: Option 4 MICE Collaboration meeting @ Columbia, 14 June 2003 slope cellar trench 2.3 metres deep services zone 3.9 m stay clear zone 5 m Main gate Exit High level exit beam axis door >= 0.8 m 4.8 m Door moved door

21. 21 MICE Shielding: Steel-lead sandwich MICE Collaboration meeting @ Columbia, 14 June 2003 Combined shielding: magnetic shielding + radiation shielding - crainable/movable sections (5-6 tonnes each) - steel/lead sandwich Steel 20 mm Pb Lead 100 mm 1 m * 1 m section: 1.45 tonnes 1m * 4 m section: 5.8 tonnes Gamma Attenuation Factor Eγ = 1 MeV Eγ = 10 MeV Lead: t=100 mm 3168 282 Concrete: t=540 mm 3187 Concrete: t=1080 mm 287 Lead vs. Concrete

22. 22 MICE Layout MICE Collaboration meeting @ Columbia, 14 June 2003

23. 23 MICE Layout MICE Collaboration meeting @ Columbia, 14 June 2003

24. 24 MICE Layout & Safety: Summary MICE Collaboration meeting @ Columbia, 14 June 2003 Fire safety: - existing door can be moved (more floor space plus better excess to MICE control room) - put 2 more doors at the MICE shielding to minimize escape roots - keep pathway open along MICE Radiation safety: - detailed information is required for the RAL Radiation Safety Officer in order to be able to calculate the shielding -> request to MICE - combined shield concept (steel-lead sandwiched panels) to make shielding compact and crainable/movable Layout : - hall layout is done; - various options for the MICE layout are under consideration