1. PHENO 2010 Christopher White, IIT 1 The Daya Bay Reactor Antineutrino Experiment Christopher White 1

2. PHENO 2010 Christopher White, IIT Backgrounds 2

3. PHENO 2010 Christopher White, IIT Water Shield and Muon Tagging System 3 A 2.5 m active water-shield around the antineutrino detectors is instrumented with 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 has A muon tagging efficiency of >99.5% RPCs water pool muon veto system experimental hall

4. PHENO 2010 Christopher 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 4 Production of RPCs

5. PHENO 2010 Christopher White, IIT PMTs for ADs and the water pool 5 PMT testing station AD Ladder 192 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).

6. PHENO 2010 Christopher White, IIT Automatic Calibration Units (ACUs) 6 ACU construction is now in “factory mode”. 68 Ge, 60 Co: Positron Energy 241 Am- 13 C: Neutron Energy LED: Timing Prototype AmC neutron sources fabricated and tested

7. PHENO 2010 Christopher White, IIT Readout and DAQ Progress 7

8. PHENO 2010 Christopher White, IIT Offline development is progressing well 8 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.

9. PHENO 2010 Christopher White, IIT Mini-Dry-Run and Dry-Run 9

10. PHENO 2010 Christopher White, IIT Mini-Dry Run Results – December, 2009 10 LED Flasher Muons one “ladder” of PMTs was instrumented and readout.

11. PHENO 2010 Christopher White, IIT Status of Civil Construction 11 May 2010

12. PHENO 2010 Christopher White, IIT First Blast: Feb 19, 2008 12 Daya Bay Is Moving Forward Quickly Groundbreaking Ceremony: Oct 13, 2007

13. PHENO 2010 Christopher White, IIT 13

14. PHENO 2010 Christopher 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. 0 1 2 3 4 5 0.05 0.04 0.03 0.02 0.01 0. Number of years of data taking Sensitivity in sin 2 2  13 (90%CL)

15. PHENO 2010 Christopher White, IIT The Daya Bay Collaboration 15