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

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.

minos near detector hall and access spaces

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