pheno 2010 christopher white, iit 1 the daya bay reactor antineutrino experiment christopher white 1

PHENO 2010Christopher White, IIT 1

Christopher White

1

PHENO 2010Christopher White, IIT

Backgrounds

2


Water Shield and Muon Tagging System

3

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


• 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 ofRPCs


PMTs for ADs and the water pool

5

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).


Automatic Calibration Units (ACUs)

6

ACU construction is now in “factory mode”.

68Ge, 60Co: Positron Energy241Am-13C: Neutron EnergyLED: Timing

Prototype AmC neutron sources fabricated and tested


Readout and DAQ Progress

7


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.


Mini-Dry-Run and Dry-Run

9


Mini-Dry Run Results – December, 2009

10

LED Flasher

Muons

one “ladder” of PMTs was instrumented and readout.


Status of Civil Construction

11

May 2010


First Blast: Feb 19, 2008

12

Daya Bay Is Moving Forward QuicklyGroundbreaking Ceremony: Oct 13, 2007

PHENO 2010Christopher White, IIT 13


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

Sen

sitiv

ity in

sin

2 2 1

3 (9

0%C

L)


The Daya Bay Collaboration

15

pheno 2010 christopher white, iit 1 the daya bay reactor antineutrino experiment christopher white 1

Documents