pheno 2010 christopher white, iit 1 the daya bay reactor antineutrino experiment christopher white 1
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PHENO 2010Christopher White, IIT 1
Christopher White
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PHENO 2010Christopher White, IIT
Backgrounds
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PHENO 2010Christopher White, IIT
Water Shield and Muon Tagging System
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A 2.5 m active water-shieldaround the antineutrinodetectors is instrumentedwith 8-inch PMTs
The high-purity water shield is divided into inner and outer regions separated by Tyvek
RPCs are positioned on top of the water pool to improve eff.
The combined system hasA muon tagging efficiency of>99.5%
RPCswater pool
muon veto system
experimental hall
PHENO 2010Christopher White, IIT
• Bakelite RPC detectors cover the water pools plus one meter of rock.• Each module has four 2m x 2m layers of RPCs, each consisting of two bare chambers. There are a total of 81 modules in the far hall and 56 in each near hall. • The RPC gas system provides each RPC module with a controlled non-flammable gas mixture. • The RPC high-voltage (HV) system provides an ~8kV voltage gap. Each HV channel provides power to 9 RPC planes split by a multiplexing box. • A muon is characterized by hits in 3 of 4 RPC layers (across modules is allowed). The efficiency of each layer should be greater than 95%.
RPC Detectors
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Production ofRPCs
PHENO 2010Christopher White, IIT
PMTs for ADs and the water pool
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PMT testing station
AD Ladder192 Hamamatsu 8” PMTs per AD (new)
All new tubes have been tested at DGUT
Some MACRO tubes are being potted for use in the water pools (supplemental).
PHENO 2010Christopher White, IIT
Automatic Calibration Units (ACUs)
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ACU construction is now in “factory mode”.
68Ge, 60Co: Positron Energy241Am-13C: Neutron EnergyLED: Timing
Prototype AmC neutron sources fabricated and tested
PHENO 2010Christopher White, IIT
Readout and DAQ Progress
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PHENO 2010Christopher White, IIT
Offline development is progressing well
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• Regular tutorials, workshops, enhanced documentation & tools.• Completed validating the analysis framework
– Release available on IHEP, LBNL, and BNL clusters– Developing realistic detector system simulation & analysis chain
• Mock Data Challenge → On/Offline Integration → AD Dry Run• Tape archive @ LBNL online and being used; 150 TB allocation for Daya Bay Hall commissioning. • PDSF and BNL Coop clusters online and heavily used.• Automated IHEP↔LBNL network testing in place.• Evaluating data movement and management software.
PHENO 2010Christopher White, IIT
Mini-Dry-Run and Dry-Run
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PHENO 2010Christopher White, IIT
Mini-Dry Run Results – December, 2009
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LED Flasher
Muons
one “ladder” of PMTs was instrumented and readout.
PHENO 2010Christopher White, IIT
Status of Civil Construction
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May 2010
PHENO 2010Christopher White, IIT
First Blast: Feb 19, 2008
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Daya Bay Is Moving Forward QuicklyGroundbreaking Ceremony: Oct 13, 2007
PHENO 2010Christopher White, IIT 13
PHENO 2010Christopher White, IIT
Schedule
• March 2009: Surface Assembly Building occupancy
• Dec 2009: mini-dry run
• Summer 2010: begin installation activities in the DB Near Hall
• Summer 2011: begin installation activities in the Far Hall
• Sometime in 2012: Begin physics operations
90% C.L.
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Number of years of data taking
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PHENO 2010Christopher White, IIT
The Daya Bay Collaboration
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