coupp 2l chamber at snolab jeter hall fermilab center for particle astrophysics
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COUPP 2L Chamber at SNOLAB
Jeter HallFermilab Center for Particle Astrophysics
All Experimenter's Meeting COUPP Special Report 211/22/10
University of Chicago
Juan Collar (PI, spokesperson), C. Eric Dahl, Drew Fustin, Alan Robinson, Matthew Szydagis
Indiana University South Bend
Ed Behnke, Joshua Behnke, Austin Conner, J. Henry Hennefeld, Ilan Levine (PI), Andrea Palenchar, Tim Raymond, Tina Shepherd, Brendan Sweeney
Fermilab
Steve Brice, Dan Broemmelsiek, Peter Cooper, Mike Crisler, Jeter Hall, Martin Hu, Hugh Lippincott, Erik Ramberg,Andrew Sonnenschein
COUPP Collaboration
All Experimenter's Meeting COUPP Special Report 3
COUPP 2L Chamber Summary
• Dark matter search using a bubble chamber filled with CF3I (operates at 20-50°C and 15-100 PSI)
• 2009 run in MINOS near hall was limited by cosmic radiation (300 ft overburden)
• Summer 2010 detector moved to SNOLAB in Ontario (6800 ft overburden)
• Chamber is now operational, shielded, and taking science quality data
11/22/10
All Experimenter's Meeting COUPP Special Report 4
SNOLAB• Recent extension has
increased the experimental space at the 6800 ft level
11/22/10
COUPP 2L Located in ‘J’ drift
1 mile hike to cage ride
All Experimenter's Meeting COUPP Special Report 5
Safety First
• Met the electrical safety authority
• Safety reviews with SNOLAB personnel before proceding with new procedures
11/22/10
All Experimenter's Meeting COUPP Special Report 6
Initial Installation
• DAQ, pressure vessel, and hydraulic system installed mid July
• Took data runs with the full hydraulic and DAQ system for three weeks
11/22/10
All Experimenter's Meeting COUPP Special Report 7
Inner Vessel
• Mark Ruschman and inner vessel arrive late August 2010
11/22/10
All Experimenter's Meeting COUPP Special Report 8
First Bubble
• 4.048 kg CF3I distilled on September 2nd
• First bubble on the next day
11/22/10
All Experimenter's Meeting COUPP Special Report 9
First Problem
• Bubbles appearing in the hydraulic fluid• Organized another trip for mid October• Leaking accumulator tank (AC1) swapped out• Fully operational October 17th11/22/10
All Experimenter's Meeting COUPP Special Report 10
Shielding
• 20 inch thick boxes made with 1” thick HDPE • Filled with SNOLAB high purity water
11/22/10
Solid Poly
Water Boxes
Seismic Damping
Completed November 5th
All Experimenter's Meeting COUPP Special Report 11
Remote Monitoring
• 3 Webcams• Remote DAQ
control• SNOLAB
personnel extremely helpful
• Real time analysis
11/22/10
All Experimenter's Meeting COUPP Special Report 12
Current Status
• Maintaining ~85% live time11/22/10
Shield Installed
Leaking Accumulator Tank
Planned Power Outage