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Implementation of MICE at RAL

Implementation of MICE at RAL. Work done in Engineering and ISIS Departments Rutherford Appleton Laboratory Contributors Iouri Ivaniouchenkov Tom Bradshaw Jim Rochford Tony Jones Paul Drumm Elwyn Baynham. Aims of the Work. Establish the feasibility to install MICE at RAL

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Implementation of MICE at RAL

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  1. Implementation of MICE at RAL Work done in Engineering and ISIS Departments Rutherford Appleton Laboratory Contributors Iouri Ivaniouchenkov Tom Bradshaw Jim Rochford Tony Jones Paul Drumm Elwyn Baynham Elwyn Baynham RAL

  2. Aims of the Work • Establish the feasibility to install MICE at RAL • Basic questions • Can it fit in the proposed experimental hall • Can the requirements for services infrastructure be met • Use of existing services • Space for installation of new services • Can the safety requirements of RAL/ISIS be met • Impact on cost Elwyn Baynham RAL

  3. Scope of Presentation • Overview of the Experimental Hall • MICE layout • MICE Infrastructure needs • Global estimates • Specific assessments - schematic/quantitative • Hydrogen system • Cryogenic plant • Chilling water plant • Electrical power services • MICE installation • Alignment , rails, support structure • Safety Issues Elwyn Baynham RAL

  4. Experimental Hall Hall: L = 47 m W = 12 m H = 8 m S = 564 m2 V = 4512 m3 Two overhead cranes (8 tonnes each) Inside Bld R5.2 Elwyn Baynham RAL

  5. MICE Layout Elwyn Baynham RAL

  6. MICE Layout Elwyn Baynham RAL

  7. MICE Layout Elwyn Baynham RAL

  8. MICE global services needs • Current status of global audit of services • Cryogenic • Helium • Effective cooling power at 4K min 300W - max 600W • Liquid Nitrogen • min 90 L/hr - max 120L/hr • Electrical • min 250kW - max 350kW • Water cooling • min - 100kW Elwyn Baynham RAL

  9. Hydrogen System: Hydrogen Module Drawing by E. Black Elwyn Baynham RAL

  10. Hydrogen System schematic layout Hydrogen buffer tank Hydrogen vent Igloo Igloo Igloo Hydrogensupply bottles Elwyn Baynham RAL

  11. Cryogenic Plant - cooling requirements • Systems requiring cryogenic cooling • Muon decay channel magnet • 4K supercritical • MICE Instrument • Sc magnets • 4 K 2 phase • H2 absorber • 14-18K gas • He absorber • 4K liquid • Sci Fi detector • 4K Elwyn Baynham RAL

  12. Cryogenic Plant - cooling requirements • Proposed configuration of refrigeration plant and interface to MICE is described in the paper of Mike Green • Concept of 2 phase for magnet coil cooling • Shields , stops and lead cooling by 14-18K gas • LH2 cooling by 14 - 18K He gas • Estimates of refrigerator power based on this arrangement • Additional requirements • Scintillating Fibre detector - LHe as absorber Elwyn Baynham RAL

  13. Cooling requirements - Sci Fibre Detector • Scintillating fibre detector option will require substantial refrigeration power • Initial estimates • 150W at 4K • 1100W at 77K ( liquid nitrogen) • Impact on the installed refrigeration capacity Elwyn Baynham RAL

  14. Refrigerator Requirements - power audit Elwyn Baynham RAL

  15. Cryogenic Plant - schematic layout Refrigerator Compressor room He tank Cold box Buffer dewar Cold box Elwyn Baynham RAL

  16. Cooling requirements - Liquid Nitrogen • Refrigerator • to get the full power rating from the refrigerator will require LN2 cooling • consumption - 90 L/hr • Sci Fibre detector will require approx 25 L/hr • Total consumption approx 115 L/hr (3000L/day) • Dedicated cooler may be the best solution Elwyn Baynham RAL

  17. Cooling Plant implementation • Implementation will need to take into account • staging of MICE • to allow modularity and flexibility • quench requirements • effects of magnetic fields • pneumatic operation • location of compressor plant • provision of building and power for compressors • if He is to be used in the absorbers Elwyn Baynham RAL

  18. Cryogenic Plant Location Schematic Elwyn Baynham RAL

  19. Cryogenic Plant Proposed Location Elwyn Baynham RAL

  20. Chilled water plant and Electrical power • Chilled water • New 1MW water plant will be built for ISIS • we are negotiating with ISIS to upgrade this to 1.5MW • Status • planning permission is granted agreement with ISIS to fund this should be reached by Spring 2003 • Electrical Power • 240V system - we have enough power in the hall • 3.3kV system new installation will be required Elwyn Baynham RAL

  21. Experiment support infrastructure • Requirements for mounting of MICE experiment • Beam height assumed 1.8-2m • Increased to avoid cutting of trench in the hall floor • Alignment • requirement – not yet defined • rail system will be required to mount elements of the experiment • Careful planning for the modular build up and testing will be necessary to ensure matching of all components and their services Elwyn Baynham RAL

  22. Support Structure Supporting rail Guiding rail Questions: 4 or more wheels ? Material – austenitic stainless steel (non magnetic) for example 304-S12 Support system specs: • max load – 5 Tonnes ? • alignment precision along the beam – 5 mm ? transverse the beam – 1 mm ? vertical – 1 mm ? - max movement along the beam – 5 m ? Elwyn Baynham RAL

  23. Support Structure: Forces 32 554 2162 86 1550 86 1357 1357 2162 554 32 153 137 1554 1550 1554 137 153 608 755 86 All forces are in kN ! Correction coils: J=93.33 A/mm2 Correction coils: J=128.89 A/mm2 Solenoid coils: J=71.96 A/mm2 Transition coils: J=44.40 A/mm2 Transition coils: J=86.95 A/mm2 Focusing coils: J=105.88 A/mm2 Coupling coils: J=95.07 A/mm2 Elwyn Baynham RAL

  24. Safety at RAL • Objectives • define the hazards specific to the engineering, installation and operation of MICE • confirm the applicable RAL rules for implementation • review implications and feasibility • note these are summarised in the note of Paul Drumm Elwyn Baynham RAL

  25. Hazards identified for the engineering of MICE • Pressure vessels/vacuum vessels • Hydrogen • X-ray and radiation • Magnetic fields • Cryogenic liquids • RF radiation • Toxic substances (beryllium) Elwyn Baynham RAL

  26. Safety at RAL • RAL Safety Rules and Protocols will apply to all aspects of MICE Implementation • special requirements for ISIS • The MICE safety case (hazard assessment) should identify the most credible accidents, analysing probability and consequence and the steps needed to reduce the risks to be as low as reasonably achievable. • An independent Safety Review Committee will review the hazard assessment Elwyn Baynham RAL

  27. Safety at RAL • The principle regulations that will need to be addressed are: • The new explosive gas regulations (ATEX). • A document explaining the explosion protection will be required • Pressure vessel regulations: • Vacuum vessels are classed as pressure vessels and must be designed as such to an agreed International Code. • RAL codes of Practice and Safety Policy • Quality Control Systems Elwyn Baynham RAL

  28. Hydrogen Safety Issues • The most significant hazard from liquid hydrogen is an explosion • Cold surfaces can cryo-pump oxygen leading to a hazardous situation with the potential for explosion. • Care must be taken to manage faults to ensure that a “chain” of events does not lead to an uncontrolled dangerous situation. Elwyn Baynham RAL

  29. Hydrogen Safety Issues • Implementation / experience at ISIS • Liquid Hydrogen is currently used in a hydrogen moderator on ISIS although the volume is somewhat different from that expected for MICE. • ISIS uses about 20L, MICE will use around 120L. • The rules and codes of practice for design, installation and operation of a liquid hydrogen system on ISIS are established for this moderator • “These will be the benchmark for MICE” Elwyn Baynham RAL

  30. Hydrogen Absorber Design • Benchmark design rules • “design must take steps to prevent the condensation of oxygen on any surface that could come into contact with a hydrogen leak”. • This is the defining statement for the engineering of the MICE absorbers. • In essence the design must prevent the ingress of air in normal operation or fault conditions • the oxygen in the system could come from long term cryopumping Elwyn Baynham RAL

  31. ISIS benchmark design vs MICE Air Air H2 H2 Vac Vac Vac Vac He MICE ISIS Elwyn Baynham RAL

  32. Hydrogen Safety Issues • Implications for MICE design and installation • MICE design of the absorber system must be identical to the ISIS benchmark or at least equivalent • Preliminary designs (schematics) must be produced which will allow a first stage assessment and comparison with ISIS for the MICE Proposal Elwyn Baynham RAL

  33. Safety Issues - Radiation protection • X-rays from Cavities • 800MHz cavities in a magnetic field will produce large dark currents . The level of radiation from this source is difficult to predict with accuracy. A 60cm concrete wall is included in the layout to reduce the radiation level to 0.5 microSV/hr • From ISIS beam • extensive shielding will be required where the beamline passes into B 5.2 - addressed by Paul Drumm Elwyn Baynham RAL

  34. Safety Issues - Magnetic fields • Limits for the public: • Stray magnetic fields in a normally accessed area must not exceed 0.5 mT(5G - pacemaker issues). • Where work must be carried out in a magnetic fields, the following limits are used: • Partial body exposure (arms, hands and feet: • 2T (20,000 gauss) for short periods (minutes) • 0.2T (200mT/2,000 gauss) for long periods (hours). • Exposure of whole body • 0.2T (200mT/2,000 gauss) for short periods • 0.02T (20mT/200 gauss) for long periods. • Limits for ISIS • injector /control room Elwyn Baynham RAL

  35. Safety Issues: Magnetic Field At the moment the 5Gauss line is outside the building – some shielding may have to be used. Elwyn Baynham RAL

  36. Field on ISIS Linac ISIS Linac is close to MICE. First indications are that the field is low enough without shielding Elwyn Baynham RAL

  37. Safety Issues: Magnetic Field Volume in blue: 1 kGauss field Volume in orange: 5 Gauss field Elwyn Baynham RAL

  38. Aims of the Work • Establish the feasibility to install MICE at RAL • Basic questions • Can it fit in the proposed experimental hall • Can the requirements for services infrastructure be met • Use of existing services • Space for installation of new services • Can the safety requirements of RAL/ISIS be met • Impact on cost Elwyn Baynham RAL

  39. Work for Proposal • Continue to develop layout in hall • Audit of services • final iteration for proposal • Safety • absorber design to ISIS benchmark • initial internal review • magnetic field worst case • Impact on cost • continue to develop the cost model with MICE Elwyn Baynham RAL

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