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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4 February, 2008
Expected WIMP response for
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
Neutrons in NUMI tunnel Testing Unit Occluding Camera View:
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: tunnel hallway, to final location under the muon veto
-3000 -2000 -1000 0 1000 2000 3000
The collaboration is now planning the installation tunnel hallway, to final location under the muon veto
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