DEAP Part I: Andrew Hime (Los Alamos National Laboratory) DEAP Concept DEAP-0 Test-Results & Requirements of a DEAP Program Synergy with CLEAN Program.

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Presentation transcript:

DEAP Part I: Andrew Hime (Los Alamos National Laboratory) DEAP Concept DEAP-0 Test-Results & Requirements of a DEAP Program Synergy with CLEAN Program Part II: Mark Boulay (Queen’s University) Status & Plans for DEAP-1 Going to the tonne Scale Dark Matter Science Advisory Group Meeting Los Angeles, CA, August 14-15, 2006

M.G.Boulay and A.Hime, Astroparticle Physics 25, 179 (2006) DEAP - Dark matter Experiment with Argon and Pulse-shape-discrimination Prompt/Singlet Light (  ~ 6 ns) Late/Triplet Light (  ~ 1.6  s) I 1 / I 3 ~ 0.3 I 1 / I 3 ~ simulated e-’s 100 simulated WIMPs

Test-Cryostat for DEAP-0 at LANL PMT LAr CsI tag Vacuum chamber windows source

PMT Pulses from LAr in DEAP-0  -like neutron-like

DEAP-0 F prompt Distributions 22 Na gammas AmBe neutrons & gammas ~ 10 keV Energy Threshold with 75% Surface Coverage with Standard PMTs

DEAP-0 F prompt Distributions gammas neutrons

Avg. No. p.e. Measured Leakage Background Leakage Projected PSD 50(2.4 ± 0.6) x (2.1 ± 1.0) x x (1.4 ± 0.4) x (1.5 ± 0.9) x x (1.0 ± 0.4) x (2.5 ± 1.1) x x DEAP-0 Results & Projections

S ~ (1.90 events / kg / year) x (  / cm 2 ) B 39Ar ~ (2.52 x 10 7 events / kg / year) Dealing with 39 Ar 1000 kg 100 kg 10 kg 1 kg R ~ 6 x R ~ 6 x 10 9 R ~ 6 x 10 8 R ~ 6 x 10 7

7 kg LAr Acrylic Light Guide Acrylic Light Guide Quartz Window Calibration Port 5” PMT Acrylic Vacuum Vessel Preliminary Background Study for 7 kg DEAP-I Predict ~5 pe/keV

210Pb Recoil in ROI Conceptual Study of Surface Contamination

Background PSDNeutron Position Shielding Energy Tagging Spectrum  /  in Target  /  in Detector  /  in Laboratory Cosmic Ray  ’s ( , n) in Detector ( , n) in Laboratory  -Induced n’s Surface Contamination Handle        ~ ~  SS S S

DEAP-I 10 kg LAr Micro-CLEAN 10 kg LNe/LAr Mini-CLEAN 100 kg LNe/LAr CLEAN 100 tonnes LNe DEAP-III 1000 kg LAr DEAP & CLEAN Program CLEAN 1000 kg LNe/LAr “warm” PMTs“cold” PMTs cm cm cm cm 2 + 1% pp-Solar SNOLAB - PSD in LAr - Surface Contamination Build Mini-CLEAN - LNe/LAr Technology - Pos. Reconstruction What is the best step? What is the optimal detector scale with LNe?