MINOS Near Detector Hall and Access Spaces
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Transcript of MINOS Near Detector Hall and Access Spaces
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MINOS Near Detector Halland Access Spaces
Presented by
Rob Plunkett
Fermi National Accelerator Laboratory
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NNNB WorkshopMay 2-3, 2002
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Introduction
• Physical Layout of Minos Shaft and Hall
• Access to Hall
• Video of hall
• Infrastructure and Services
• Hall Environment
• Conclusions
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Hall Schematic showing Detector and Services
LCW Distribution
“House” Power
Magnet P.S.
Experiment Electronics
Experimental Power
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Hall Schematic showing Beam Envelope
Notes: Beam descends at 3.3o angleArea in front of detector has been kept clear from muon rate considerations!
Beam envelope 12 ft. diameter
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Elevation of MINOS Service Building
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Details of Hall and Detector
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Underground Schematic showing Detector Installation Path
340 ft.400 ft. shaft to end
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Personnel Elevator
Elevator Characteristics~20 person capacity
4000 lb. load limit
Speed 200 ft/s
Size 5’4” x 7’10” (about like highrise)
Separate emergency elevator
Vertical Doors
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Details of MINOS Shaft
Clear load space 22 ft. max.
8 ft. slot
5 ¾ ft
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Access Tunnels showing Beam
Narrow Section
Wider Section (downstream)
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Floor Area near Shaft
Sump trench
Elevator (separated by wall)To Minos (level)
To Absorber (9% grade)
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View of Hall Outfitting
Escape Passageway
Drip Ceiling Crane Rails
Looking towards Soudan
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Equipment Cranes
• There are cranes installed in both the MINOS service building and the MINOS hall.
• For use lowering equipment down shaft:– 15 ton capacity
– Speed 40 ft/min.
– Hook height 18’6”
– “Pitch and catch” control system
• For assembling MINOS detector in hall:– 15 ton capacity
– Hook height 22 ft.
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Installed Electrical Power
• Power in Minos Hall comes in “house power” and experimental “quiet power” varieties. Will focus on quiet power for now.
• Sizing of capacity for quiet power in hall has been determined by the needs of the Minos Experiment.– Front-end electronics
– DAQ electronics
• Current experimental needs of the experiment are served by:– Two 75 KVA transformers ==> 150 KW.
• Upstream panel board is sized for 600 A @ 480 V or 300 KW.
• Upstairs transformer is 750 KVA.
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Pumping and Water Control
• Tunnel system will generate between 320-400 gal/min. steadily.
• All water is pumped out of MINOS shaft sump.– Target and decay pipe system drain to this point.
• Before it is removed, water will serve as primary cooling for the underground equipment.
• Pumping system based around redundancy.– Two well pumps, each with adequate capacity to handle job separately.
– Third backup pump as well.
– Emergency generator.
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Installed Water Cooling
• Cooling needs (LCW) of MINOS experiment include:– Direct Water cooling of front end ASIC electronics.– Cooling of MINOS magnet.– Cooling of magnet power supply
• Our primary cooling water supply is expected to be the tunnel inflow.– One large unit Fan Coil (25 KW) for general hall environmental control– 4 units for supplemental electronics cooling @ 7 KW each.
• Heat exchanger for LCW sized for 150 KW. This is adequate but not generous for experiment.
• Little or no spare capacity– May need to add dehumidifiers– Loads usually come in higher than design.
• Proposals would prudently plan for additional cooling. (My opinion).– Probably needs additional water supply
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Expected Environmental Conditions
• Temperature in Hall will be held at 60-70 degrees F.
• Fan coil units with auxiliary heaters.
• Relative Humidity at 60%
• Egress corridor maintained at positive pressure w.r.t. hall.
• Basic air flow is from corridor into the hall, then exiting through vent to surface.
• Drip ceiling covers area over MINOS detector only.
• Remainder of hall will be quite dry anyway.
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Conclusions
• Needs of MINOS experiment will be well-met by the MINOS service building, shaft, and experimental hall.
• Services have been sized to be appropriate. No extra cooling capacity.
• Beam itself enters at an angle. Upstream section of hall has beam center about 10 feet above floor.
• Experiment has specified a stay-clear drift space of 40 m upstream of detector, and this is reflected in the civil construction. Material in this area would require extensive simulation to understand its effects.