1. 1 Status of infrastructure MICE Video Conference, August 17, 2005 Yury Ivanyushenkov Applied Science Division, Engineering and Instrumentation Department RAL

2. 2 Magnetic shielding in the MICE hall MICE hall preparations Support system overview Spectrometer solenoid support Scope

3. 3 Magnetic shielding in the MICE hall

4. 4 Magnetic field should not exceed 5 gauss in a public area (ISIS control room). Magnetic modelling predicts that the 5 gauss line is outside the MICE hall – passive shielding may have to be used. MICE fringe fields: Problem Volume in blue: 1000 gauss field Volume in orange: 5 gauss field

5. 5 Fringe fields: Passive magnetic shielding Flux lines from unshielded coils (MICE Stage 6) Flux lines from shielded coils with a cylindrical, 10 mm thick steel shield, D=10m. 2d axi-symmetric model of iron shield 20 mm r =4 m Coil axis

6. 6 Magnetic shielding: Thickness 5 gauss Field detail in the shield region for the different thickness of steel cylinder modelled.

7. 7 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 By Jim Rochford

8. 8 BH curve for iron as used in the models MICE magnetic shields: Iron

9. 9 3d model of complete rectangular shield B peak =0.67T MICE magnetic shield: Complete rectangular shield 5 gauss line

10. 10 3d model of ½ a rectangular shield B peak =0.93T 5 gauss line MICE magnetic shield: Half of a rectangular shield

11. 11 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

12. 12 Peak field in shield for different models MICE magnetic shield: Peak field in shield

13. 13 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

14. 14 Top Fx=0,Fy=-1470,Fz=0 1470N 150N 1330N Z X Y MICE magnetic shield: Forces Sides Fx=(+/-)1330, Fy=-150, Fz=0

15. 15 MICE magnetic shielding 2m 3.8m 5.6m 17m 6m Revised 3D model: Open ended rectangular box model 20mm thick iron plate + Two 150mm thick iron plates ID 40mm OD 3.6m

16. 16 MICE magnetic shielding For 200Mev/c, beta 43cm - mode Fringe field on outer walls

17. 17 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 Next step: - Create a realistic two-wall model of the shield based on the MICE layout (see next slide) and the latest version of MICE magnetic configuration; - Check shielding efficiency ( wall thickness is a parameter). MICE magnetic shield: Summary of modelling

18. 18 MICE magnetic shielding layout Magnetic shielding walls

19. 19 Magnetic shielding walls MICE magnetic shielding layout

20. 20 Magnetic shielding in the MICE hall Conclusion: Preliminary modelling suggests that passive shielding of MICE will work. Modelling needs to be finalized. Magnetic shielding design needs to be completed.

21. 21 MICE hall preparations

22. 22 MICE phase I initial

23. 23 MICE phase I final

24. 24 MICE hall preparations: To-do list 1.Floor levelling: concrete plinth at the lower floor part of the building fill up the cellar floor extension frame over the trench 2.Beam line radiation shielding support over the trench. 3.Staircases modification: the staircase on the ISIS linac side of the building the staircase on the ISIS control room side 4.Holes in the roof and the north wall: in the roof – for ventilation ducts in the wall – for hydrogen vents

25. 25 MICE hall preparations: To-do list (2) 5.Hydrogen system R&D area hydrogen extract hood and vent lines part of mezzanine floor part of magnetic shielding wall 6.The rest of magnetic shielding walls. 7.Beam-line radiation shielding.

26. 26 MICE hall preparations: Status and plans General layout is completed. Discussion with RAL civil engineers has started -> work will be done by the external company Programme of hall modification is being prepared

27. 27 Support system overview

28. 28 Support structure – Layout and sequences

29. 29 Support structure - Required rail positions MICE Stage IVMICE Stage V Rail positions of downstream detector for Stages IV & V will overlap with final stage VI rail positions

30. 30 Support structure – Rail and Force transfer concept Y X Z Magnetic force Traverse in X on rail system to give location to +/- 2mm Jack from rail and position in x-y-z to survey targets on vacuum vessel Shim to blocking plates to locate in x-y-z and react forces Module Jacks Rollers Rails Floor Plate Y support location Shim Beam Axis Survey Target

31. 31 Support structure – Super-module Module to module joints to react forces in Z CC/RF module with stiff support structure

32. 32 Support structure – Rail-mounting concept Platform moves on rails Platform is jacked from the rails

33. 33 Support structure – Force transfer concept - Y Shimming to react vertical forces

34. 34 Support structure – Force transfer concept - Z Shimming to react axial (Z) forces

35. 35 MICE rail system Rails

36. 36 Concrete floor Support structure Dia 650 Aperture in ISIS wall 1684.2 160* 1524* Height of the beam in the MICE hall

37. 37 ModuleWeight, kg AFC module1700 RF module4636 Radiation shield310 Tracker module6650 (including 1200 kg of magnetic shield) MICE support structure - Module weights Table from Wing Note: Table requires updating Crane lifting capacity is 12 tonnes (two cranes joined) or 8 tonnes (one crane)

38. 38 MICE support structure – Next steps Revise support structure requirements/specs for full MICE - include and analyze requirements of access to every module ( collect information from all technical supervisors) Who is doing this ? Suggest support structure for Stage 2 (MICE phase 1) (is it different from the one for complete MICE ?) Discuss revised version of support structure at RAL meeting

39. 39 Spectrometer solenoid support

40. 40 Solenoid out the beam - position Solenoid in the beam - position Spectrometer solenoid positions

41. 41 Spectrometer solenoid support: Next steps Revise support structure requirements - include and analyze requirements of access ( collect information from the technical supervisors) Who is doing this? Suggest support structure for spectrometer solenoid at RAL meeting

42. 42 MICE module max height Concrete aperture Important: The max height from the bottom of the support frame to the top of a module should not exceed 3200 mm Concertina door Hinged door Max horizontal opening 3200 mm Max vertical opening 3360 mm