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1
MINOS Near Detector Halland Access Spaces

• Presented by
• Rob Plunkett
• Fermi National Accelerator Laboratory

2
Introduction

• Physical Layout of Minos Shaft and Hall
• Access to Hall
• Video of hall
• Infrastructure and Services
• Hall Environment
• Conclusions

3
Hall Schematic showing Detector and Services
Experiment Electronics
Experimental Power
Magnet P.S.
House Power
LCW Distribution
4
Hall Schematic showing Beam Envelope
Beam envelope 12 ft. diameter
Notes Beam descends at 3.3o angle Area in front
of detector has been kept clear from muon rate
considerations!
5
Elevation of MINOS Service Building
6
Details of Hall and Detector
7
Underground Schematic showing Detector
Installation Path
400 ft. shaft to end
340 ft.
8
Personnel Elevator
Elevator Characteristics
20 person capacity 4000 lb. load limit Speed
200 ft/s Size 54 x 710 (about like
highrise) Separate emergency elevator
Vertical Doors
9
Details of MINOS Shaft
Clear load space 22 ft. max.
8 ft. slot
5 ¾ ft
10
Access Tunnels showing Beam
Wider Section (downstream)
Narrow Section
11
Floor Area near Shaft
To Absorber (9 grade)
Sump trench
Elevator (separated by wall)
To Minos (level)
12
View of Hall Outfitting
Crane Rails
Drip Ceiling
Escape Passageway
Looking towards Soudan
13
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 186
• Pitch and catch control system
• For assembling MINOS detector in hall
• 15 ton capacity
• Hook height 22 ft.

14
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 gt 150 KW.
• Upstream panel board is sized for 600 A _at_ 480 V
  or 300 KW.
• Upstairs transformer is 750 KVA.

15
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.

16
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 _at_ 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

17
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.

18
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.