Status of COUPP Experiment in the MINOS tunnel. Erik Ramberg AEM 4 February, 2008. COUPP Timeline. Spring, 2004: Installation of U.of C. bubble chamber as test beam experiment T945 Dec 2005-Nov. 2006: First engineering run resulting in 250 kg-days exposure
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Status of COUPP Experiment in the MINOS tunnel
4 February, 2008
Expected WIMP response for
New Run of 1-liter Chamber
Inner vessel has been entirely rebuilt with materials believed to have lower radioactivity.
New run started July 30, 2007.
Some radon introduced during filling, now decayed to equilibrium - on the order of handful of events per day
Dec. 3, 2007: End of Current Physics Run Due to Acoustic Testing Unit Occluding Camera View:
Neutrons in NUMI tunnel
KTEV hodoscopes were reused as COUPP -veto
Many thanks to John Voirin, Russ Rucinski, Todd Nebel
Efficiency of veto array with respect to ADC in thick counter -
Better than 95% efficient, with two nonworking top PMT’s
Installed thick counter triggered by muon telescope
Started up run last week and obtained ‘Golden’ event:
-3000 -2000 -1000 0 1000 2000 3000
The collaboration is now planning the installation
of the COUPP 60 kg chamber in the MINOS hall.
One possibility is to build a water Cerenkov
shield/veto for use in the NUMI tunnel
that could then be transported to a
deep underground site:
Current New water DAQ and
setup tank veto control