1. 1 MICE at RAL MICE Collaboration meeting @ RAL, 2 November 2003 Elwyn Baynham, Tom Bradshaw, Iouri Ivaniouchenkov, Tony Jones, Jim Rochford Engineering Department, RAL

2. 2 Scope of presentation Layout Infrastructure : Hydrogen system Infrastructure : Cryogenic system Next steps MICE Collaboration meeting @ RAL, 2 November 2003

3. 3 MICE layout : Conceptual points MICE Collaboration meeting @ RAL, 2 November 2003 MICE shielding incorporates: - radiation shielding - magnetic shielding Radiation safety : - a roofed blockhouse ( to shield against direct and scattered X/gamma-rays and neutrons) Fire safety: - hydrogen zone is a high risk fire zone => max 25 metres long escape path

4. 4 MICE layout : Experimental hall MICE Collaboration meeting @ RAL, 2 November 2003 View upstream the beam View downstream the beam

5. 5 MICE magnetic shielding MICE Collaboration meeting @ RAL, 2 November 2003 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

6. 6 MICE Collaboration meeting @ RAL, 2 November 2003 MICE magnetic shielding For 200Mev/c, beta 43cm - mode Fringe field on outer walls

7. 7 MICE Collaboration meeting @ RAL, 2 November 2003 cellar 1 m services zone Concrete radiation shielding Steel magnetic shielding stay clear zone Scale: Main gate Exit High level exit Sliding lead door Path way >= 0.8 m 5.6 m MICE Layout Option: MICE restricted area is inside a roofed blockhouse Door door cold box Bridge 3.8 m Door Sliding lead door

8. 8 MICE Layout Version: 28 October 2003 MICE Collaboration meeting @ RAL, 2 November 2003

9. 9 MICE Layout Version: 28 October 2003 MICE Collaboration meeting @ RAL, 2 November 2003

10. 10 MICE Collaboration meeting @ RAL, 2 November 2003 cellar 1 m services zone Concrete radiation shielding Steel magnetic shielding stay clear zone Scale: Main gate Exit High level exit * Sliding lead door 5.6 m door cold box 3.8 m MICE Layout Option: MICE restricted area in the hall is separated with a single shielding wall * Door is normally blocked when MICE is running

11. 11 MICE Collaboration meeting @ RAL, 2 November 2003 cellar 1 m services zone Concrete radiation shielding Steel magnetic shielding stay clear zone Scale: Main gate * Exit * High level exit * 5.6 m door cold box 3.8 m * All doors are normally blocked when MICE is running MICE Layout Option: All the hall is a MICE restricted area

12. 12 MICE Collaboration meeting @ RAL, 2 November 2003 MICE layout : Questions Can we run MICE without access into the experimental hall ?

13. 13 Hydrogen system: Conceptual points MICE Collaboration meeting @ RAL, 2 November 2003 Closed system concept : - hydrogen absorber and a storage unit form a single closed system in a way that hydrogen is either stored as a gas in the storage unit or is liquefied in the absorber; - pressure in the system is always higher than the atmospheric pressure. Individual hydrogen system for each absorber Ideally it is a truly passive system Air can not leak inside the system Safety pros: Minimal amount of hydrogen per system

14. 14 Hydrogen system: Options Hydrogen storage unit = large (about 30 m 3 ) tank Pros: truly passive system Cons: about 100 m 3 for the location of tanks (=> on the roof ?) MICE Collaboration meeting @ RAL, 2 November 2003

15. 15 Hydrogen system: Options Alternative option: Hydrogen storage unit = compact (< 1 m 3 ) metal hydride bed Pros: - very compact system (easier to collect hydrogen in case of leak) - hydrogen is stored as a solid compound Cons: not a passive system (requires active heater/cooler) A question then: is it a reasonable compromise from the safety point of view ? MICE Collaboration meeting @ RAL, 2 November 2003

16. 16 MICE Collaboration meeting @ RAL, 2 November 2003

17. 17 MICE Collaboration meeting @ RAL, 2 November 2003

18. 18 Hydrogen system layout: Option with a hydrogen tank Concrete radiation shielding Steel magnetic shielding Hydrogen storage tank H 2 absorber MICE Collaboration meeting @ RAL, 2 November 2003 H 2 buffer tank

19. 19 MICE Collaboration meeting @ RAL, 2 November 2003 H 2 Storage unit Ventilation duct Radiation shielding wall H 2 Buffer Tank (1m 3 approx) H2 absorber Vacuum jacket Hydrogen system layout: Option with a metal hydride unit

20. 20 Hydrogen system layout: Option with a hydrogen bed MICE Collaboration meeting @ RAL, 2 November 2003

21. 21 MICE Cryogenic System Design Tom Bradshaw Iouri Ivaniouchenkov Elwyn Baynham MICE Meeting October 2003

22. 22 System Requirements Decay magnet (PSI Magnet) We need to cool this magnet separately as it was designed to operate with supercritical helium (it could probably run on two-phase). This will be installed at an early stage and needs testing. Also – it will be required for the muon beam line when MICE has gone…. Solenoids Detectors Absorbers

23. 23 System Requirements Component list Item14K4K (Watts) Absorbers All sources150e-mail from MAC Transfer lines4127.4M Green estimate Magnet shield cooling Couplers x230.33.2M Green estimate Focus magnets x321.95.2M Green estimate Detector mags x213.82.8M Green estimate Current leadssmall Detectors40A Bross e-mail Total W257.0078.60 Equivalent 4.4K80.7778.60 (Total = 159.4W) Summary Grand total159.4 Contingency30% Budget for 207.18Watts Note that we may need to run with Helium in the absorbers (TBC)

24. 24 Cryogenic System Basic Layout Powered valve Gate valve Relief Valve Spectrometer Absorber/Focus Coupling Absorber/Focus Coupling Absorber/Focus Spectrometer SciFi Detector 4K 14K Return Etc…. Compressors Gas Store 4K 14K Note that we need 14K for hydrogen absorbers Layout assumes that we can use 14K for shield cooling Valve box Cold box Control dewar

25. 25 Staging Step 1Decay magnet + Sci-Fi Step 2plus spectrometer Step 3plus spectrometer Step 4 plus absorber/focus + hydrogen Step 5 plus coupling absorber/focus + hydrogen Step 6plus coupling absorber/focus + hydrogen Spring 2006 2007 Dates are approximate …..

26. 26 Refrigerator power TCF 50 Refrigerator power (Linde)

27. 27 Refrigerator costs TCF 20 for decay magnet - £324k TCF 50 for everything else - £782k –But does not include control dewar, valve box or transfer lines.

28. 28 Cost reduction exercise Need to reduce cost of cryogenics –Use of cryocoolers on the magnets will reduce the requirement considerably but will increase the cost of the individual magnets provided by the participants, as the individual design is more complex. –Looking to borrow/re-use existing plant (possibly CERN) but cold box may require modifications to get 14K. Installation and re-commissioning costs will be high and we don’t have much manpower. –We will look at transfer line costs but the staging of MICE and the need to change absorbers makes this difficult.

29. 29 MICE Collaboration meeting @ RAL, 2 November 2003 Cryogenic system: Conceptual points Individual cryogenic system for the beam-line SC solenoid Common cryogenic system for the rest of MICE MICE cooling power requirements, Watts @4.2K Beam-line SC solenoid 35 35 MICE: Magnets 40 60 Absorbers 100 60 SciFi detectors 150 40 (7:1 option) Extra for absorbers with LHe 53 53 -------- ------- Sub-total: 343 213 Total 378 248 + 30 % margin 500 322 Proposal Revised

30. 30 MICE Collaboration meeting @ RAL, 2 November 2003 LINDE Helium liquefier/ refrigerator TCF20 Cold box with integrated purifier Dimensions: 1985 mm(L)×1100mm(W)×2227mm(H) Weight: 1280 kg approx Utility requirements: Power : 400 V / 50Hz / 3 phase / 3kW Cooling water: 0.4 m 3 /hour, 3-6 bar, 10-25 ° C, closed cycle is preferred Helium gas: Helium Grade A (99.996 Vol%) LN2 consumption: 0.8-1 ltr/ltr LHe, saturated liquid Oil injected screw compressor Model: KAESER DSD201/241 Motor: 110/132 kW Dimensions: 2.23 m(L)×1.96 m(W)×1.86 m(H) Weight: 3300/3400 kg Utility requirements: Power: 400 V/ 50 Hz / 3 phase/ ? kW Water (for water cooled type): 6.7-8.1 m3/hour Air (for air cooled type): 14000-21000 m3/hour Oil removal system L: 0.7 m W: 0.8 m H: 2.4 m 200 kg Pressure control panel L: 0.8 m W: 0.42 m H: 0.8 m 50 kg Recovered helium gas drier L: 0.3 m W: 0.3 m H: 1.9 m 75 kg Pure gas buffer vessel Volume: 3 – 8 m3 (for liquefaction rate: 30-75 ltr/hour) Design pressure: -1/+16 barg Control system Type: SIEMENS SIMATIC S7-300 with a SIMATIC OP270-6’’ operator panel (for a stand-alone control and monitoring) Operating system: S7 (runs on Windows 95 and higher) Remote monitoring an control: via MPI interface (up to 5 metres) to PC Plant performance Liquefaction capacity: without LN2 pre-cooling 18 / 30 / 37 litres/hour ( compressor: DSD141/201/241) with LN2-pre-cooling 36 / 57 / 78 litres/hour ( compressor: DSD141/201/241)

31. 31 MICE Collaboration meeting @ RAL, 2 November 2003 LINDE Helium liquefier/ refrigerator TCF50 Cold box with Instrument panel and Terminal box Dimensions: 2400 mm(L)×1900mm(W)×3270mm(H) Weight: 2600 kg approx Utility requirements: Power : up to 6 kW (3/1 phase, standard voltage) Cooling water: up to 0.95 m 3 /hour, 3-10 bar, 18-32 ° C Instrument air: up to 10 Nm 3 /hour, 6 bar min, Helium gas: Helium Grade A (99.996 Vol%) Oil injected screw compressor Model: KAESER ESD 351-50 Motor: 200 kW Dimensions: 2.65 m(L)×2.2 m(W)×2.2 m(H) Weight: 4900 kg Utility requirements: Power: 214 kW Water : 18 m3/hour Air : 4 m3/hour Oil removal system and Gas management panel L: 1.4 m W: 1.3 m H: 2.5 m ? kg Pure gas buffer vessel Control system Type: SIEMENS SIMATIC S7-400 with a SIMATIC OP270-10’’ operator panel (for a stand-alone control and monitoring) Operating system: S7 (runs on Windows 95 and higher) Remote monitoring an control: via MPI interface (up to 5 metres) to PC Plant performance Refrigeration: 280 W – 525 W * @ 4.5 K Liquefaction: 60 l/h – 200 l/h * @ 4.5 K * with LN2-pre-cooling Volume: ? m3 Design pressure: ? bar Gas drier L: ? m W: ? m H: ? m ? kg Cold box Instrument panel Terminal box Control panel

32. 32 MICE at RAL: Next steps Layout: - decide which option to implement (roofed blockhouse / single shielding wall / no additional shielding) => which option does Collaboration prefer ? - check with RAL/ISIS safety people - suggest magnetic shielding layout (based on the results of modelling) - modify the AutoCAD drawing Hydrogen system: - finish conceptual design - finish safety analysis - implement into the MICE layout Cryogenic system: - finish the layout for PSI solenoid cryogenics - decide which way to go for the rest of cryogenics: dedicated cryogenic plant (new or re-use) / cryocoolers on the magnets MICE Collaboration meeting @ RAL, 2 November 2003 Should be outcome of the AFCSWG activity