mice - uk project progress roy preece 30 th april 2013
TRANSCRIPT
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MICE - UK Project Progress
Roy Preece
30th April 2013
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Overview
• Focus Coil
• Magnet 1 Cooling / Testing
• Magnet 2 Construction Progress
• Magnetic Mitigation
• Analysis
• West Wall
• Rack Room 2 and Control room
• Partial return yoke
• RF
• DL and Hall operations
• Hall operations
• Decay Solenoid
• Spectrometer Solenoid frames
• LH2
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Focus Coil – Magnet 1 Cooling / Testing
• Test of the cryo coolers – 23rd November– Successful operation with first and second stage cooling.– Water chiller operated well– Confidence for starting the LN2 cooling
• LN2 cooling – 26th November– Goal of 90K for the cold mass– LN2 cooling during the day– Pump and purge with He gas 3 times– Cryo cooler operate overnight.– Allow second stage of cold head to warm to 80K before re-starting LN2 input.– Final LN2 input 6th December – Cold mass at 90K
• Coolers operating – 6th December– He gas regulated to input 1.05 bar to the cold mass Helium circuit– Approximately 20 bar of gas has been used (not lost) – Cold mass and second stage heads at temperatures that indicate Helium being condensed.
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Focus Coil – Magnet 1 Cooling / TestingC
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LN2 Cooling(Cryo cooler overnight)
Coolers Operating
Coolers Operating
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Cold Mass temps
Radiation Shield2nd Stage Head
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Focus Coil – Magnet 1 Cooling / Testing
• Cooling to Full• Gas input from bottle pack – 1.05 bar• Level sensor operating but not able to communicate with the control system.• System cooling over the Christmas period• By the New year the level was reported as being 100%.• Pressure feedback heater systems operating with a regulation of 0.005 bar.
• Level reduced to 80% using the pressure regulation heaters and the exhaust poppet valve.
• Shows a system that can be adjusted without issue• Pressure regulated at 1.14 bar with a gas bottle backup set to 1.05 bar.
• System safety backup• In the event of heater failure gas bottle would over pressurize.
• Easily demonstrated zero boil off conditions.• Control system and monitoring works well.
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Focus Coil – Magnet 1 Cooling / Testing
• Solenoid mode powering
• Powering in Solenoid mode starts 11th January.
• Quench induced at 50A to test the dump resistors and quench system
• Some minor issues casing false quenches, problems solved.• Power supply controller • Threshold of the voltage limit to low – raised for following tests to 500mV
• Solenoid mode operating current of 114A achieved, held and ramped down.
• Magnet cabling re-configured to operate in Flip mode (225A operating current)
• Scope logging applied to the Quench system to log the quench events
• Quenches occur at 145A, 152A, 158A, 161A and 162A
• Concern over the lack of significant jumps in current
• Tesla stop the testing until understanding of the quenches.
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Focus Coil – Magnet 1 Cooling / Testing
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Focus Coil – Magnet 1 Cooling / Testing• Continued Flip mode powering
• Following discussions between the MICE AFC group and Tesla is was decided to continue with testing
• Investigation of the voltage at the splice joints is to be looked into, 1 splice / coil
• Ramping up to a nominal current ~ 100A
• Continue to quench
• Quench occurred at 170A• A significant jump from the last interval
• Plans are to continue applying current, Tesla have ordered more LHe to be delivered this week.
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Focus Coil – Magnet 2 Construction Progress• Construction
• The outer vacuum vessel is being leak tested at the moment
• Background He rate is high so causing some problems in ascertaining the actual leak rate of the vessel.
• Tesla are confident of there being no leaks in the vessel
• Radiation shield is nearing completion.
• Problem found with a sensor so intervention needed
• MLI wrapping of the radiation shield will be completed this week
• Cold Mass
• Will be inserted and mounted onto the supports this week
• Alignment will be carried out with oversight by Jason Tarrant
• He Turret
• The second He turret is being constructed in parallel to the main magnet construction.
• It is intended to be shipped with the magnet
• Oversight and Schedule• Andy Nichols is now making regular
visits to discuss with Tesla the progress and scheduled delivery.
• The forecast is for the second Focus Coil to arrive at RAL in July
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Magnetic Mitigation - Analysis• Model created using Opera and analysis using Vector Fields
• Detailed model for Step IV (more analysis of Step VI)
• Beam line magnets included
• DSA area
• Current shielding walls
• As much ferrous material equipment as possible, size limitations.
• Consideration of the ISIS and MICE control rooms for personnel safety.
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Magnetic Mitigation - Analysis
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Magnetic Mitigation – West wall
• Cryo Cooler head compressors - Single and Two stage• Analysis has shown that the original location under the south mezzanine is unsuitable
• Field in the area around 400 gauss• Local shielding would be required for each compressor• High cost ~ £15k per compressor
• Moving the compressors to the West wall• Reduces the ambient field to around 5 gauss• No need for local shield• Furthest distance possible (compressor hoses)• Suitable for Step IV and Step VI compressors
• Number of compressors at each stage• Step IV – 15 Two stage and 4 Single stage• Step V – 21 Two stage and 4 Single stage• Step VI – 27 Two stage and 4 Single stage
• Limitations• He pressure lines no longer than 30m• Access and egress to the main door for magnet deliveries, and other large equipment• Minimise the work to “changes” to the current hall arrangements
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Magnetic Mitigation – West wall
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Magnetic Mitigation – West wall
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Magnetic Mitigation – Rack room 2 and MLCR
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Magnetic Mitigation – Partial Return Yoke
• Parallel analysis at Brook Haven mainly aimed at the Step VI configuration
• Analysis and design is in place for the Step IV configuration
• Work needs to be started to gain a cost and resourced schedule for the installation effort.
• Changes to South Mezzanine
• Positioning of the Tracker cryostats
• Sliding floor changes
• Trench cabling / infrastructure changes
• Logistics
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RF – DL and Hall Operations• First Amplifier has reached 1.2 MW.
• Changes to the contact arrangements have been made to reduce air –side electrical breakdown
• Re-testing has re-started but are having trouble with the crowbar high voltage breakdown safety device.
• Current test has reached 125KW
• RF Engineer is now in post and has started work for the current testing period
• Also working on the requirements for the TIARA grant
• Water system for the RF Amplifier
• Installation of the Amplifier , Coax and dummy load
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Hall Operations
• Decay Solenoid
• The magnet has been cooled in preparation for EMR running
• The new quench protection system will be tested with the old power supply
• The new power supply is scheduled for delivery in July
• Spectrometer Solenoid Frames
• Both frames have been installed into position
• The upstream frame has been loaded (5 tonnes) and test survey alignment carried out
• Model of a solenoid manufacture to aid with the alignment of the tracker patch panel and other service arrangements.
• LN2 system
• A new Hydrogen transfer line has been designed and procured in preparation for installation for Step IV operations