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