Status of coupp experiment in the minos tunnel
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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

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Status of coupp experiment in the minos tunnel

Status of COUPP Experiment in the MINOS tunnel

Erik Ramberg

AEM

4 February, 2008


Coupp timeline

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

  • Nov 2006: E961 (60 kg chamber) granted stage 1 approval

  • July, 2007-Nov. 2007: Physics run with low background vessel

  • September 2007: Fermilab Wine and Cheese talk

  • Dec 2007: Paper approved for publication in Science magazine

  • December 2007: Move chamber to new location under muon veto


Data from 2006 run

Data from 2006 Run

Energy Threshold

In KeV

Radon

background

  • To be published soon in Science magazine.

  • Data from pressure scan at two temperatures:

Solid lines:

Expected WIMP response for 

SD(p)=3 pb


New run of 1 liter chamber

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

Dec. 3, 2007: End of Current Physics Run Due to Acoustic Testing Unit Occluding Camera View:

  • Can still take data, with slightly reduced active volume

  • Decided not to open up chamber and spoil low background environment

  • - At this point we decided to move the detector under the new muon veto array to determine muon induced background


Status of coupp experiment in the minos tunnel

Neutrons in NUMI tunnel

KTEV hodoscopes were reused as COUPP -veto

  • neutron flux likely dominated by rock radioactivity in a site this deep.

  • - Muon veto and 30 cm of polyethylene potentially allow us to reach <0.1 c/kg day


Status of coupp experiment in the minos tunnel

Move of bubble chamber from previous location in MINOS tunnel hallway, to final location under the muon veto

Many thanks to John Voirin, Russ Rucinski, Todd Nebel


Efficiency of muon veto

Efficiency of Muon Veto

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


Status of coupp experiment in the minos tunnel

Started up run last week and obtained ‘Golden’ event:

  • Muon veto coincident

  • NUMI beam signal coincident

  • Two bubble event

  • Observed several in first few days of running

NUMI

Veto

Acoustic

Pressure

-3000 -2000 -1000 0 1000 2000 3000

Time (microseconds)


Status of coupp experiment in the minos tunnel

  • MEANWHILE:

  • - We are contructing a

  • 15 kg chamber in Chicago

  • and a 60 kg chamber

  • here at Fermilab


Status of coupp experiment in the minos tunnel

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


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