Daya Bay113大亚湾反应堆中微子实验触发和数据获取系统李小男,IHEPOn behalf ofDAQ:IHEP7th高能物理学会大会，李小男，高能物理研究所
7 th 高能物理学会大会, 李小男, 高能物理研究所 1 大亚湾反应堆中微子实验 触发和数据获取系统 李小男, IHEP On behalf of DAQ:IHEP
Daya Baysin?2013 Measurement at reactors113VeWellunderstood,isotropicsourceofelectronanti-neutrinosOscillations observedVeas a deficit ofvVeDetectorsarelocatedVundergroundtoshield0OVeagainst cosmicrays1.0sin22013Unoscillatedfluxaioobservedhere元E/2m13P(V。→v)=1-sin 203 sin(△miL/4E)1500 metersDistance (L)27th高能物理学会大会，李小男，高能物理研究所
7 th 高能物理学会大会, 李小男, 高能物理研究所 2 sin 22q13 Measurement at reactors νe νe νe νe νe νe Distance (L) Probability ν e 1.0 1500 meters Unoscillated flux observed here Well understood, isotropic source of electron anti-neutrinos Oscillations observed as a deficit of νe sin22θ13 (ν ν ) 1 sin 2θ sin ( / 4 )ν 2 1 3 2 1 3 2 P e → e = − m L E νe νe νe νe νe νe Detectors are located underground to shield against cosmic rays. πEν /2Δm2 13
Daya BayDayabay Reactor Neutrino Experiment113Far detector900 mNear detector00465mMid HallLingAo ll607 m810 mLingAo coresNeardetectorEntrapce292mDayaBaycoresTotalTunnellength~3000m37th高能物理学会大会，李小男，高能物理研究所
7 th 高能物理学会大会, 李小男, 高能物理研究所 3 Dayabay Reactor Neutrino Experiment 900 m 292 m 465 m 810 m 607 m Total Tunnel length ~ 3000 m
Dsya BayDetectingV113Inverse β-decay in 0.1%DAYA.BAYMUONSYSTEMGd-doped liquidHEADCRANscintillatorReaction: V, + p-→e* +nCAME(E.>2m.=1.022MeV)Prompt signal:e++e→2y'sDelayed signal: n+Gd →Gd'+y's (E, ~8MeV, t。~28μus)WATERDelayed signal: n+ p-→ d +y(E, = 2.2MeV, To ~ 200us)ANTINEUTRINODETECTORSa*PMTWATERCHERENKCAntineutrino signal.MODLLEalgorithm implemented inoffline or on onlinecomputer farmTime coincidence- Energy correlated47th高能物理学会大会，李小男，高能物理研究所
7 th 高能物理学会大会, 李小男, 高能物理研究所 4 Detecting e 0 0 ( >2 =1.022MeV) Reaction: Prompt signal: Delayed signal: ( ~ 8MeV, ~ 28 ) ( 2.2MeV, ~ 2 2 ' Delayed signal 00 ) ' : e e e e n e n p E m G e Gd d E s s n d s p E s + + + − + → + + → + → + + → + = • Inverse -decay in 0.1% Gd-doped liquid scintillator • Antineutrino signal, algorithm implemented in offline or on online computer farm – Time coincidence – Energy correlated
Daya BayReguirements of readout electronics13Readoutboard designedfor all detectorsystems exceptRPCNeutrinodetector:ChargemeasurementDynamicrangeforeachPMT:0PE--5ooPE- 50 p.e is the maximum for a neutrino event~50op.e.forthrough-goingmuons.resolution:<10%@1p.e,0.025%@400p.e.. Noise < 0.1 p.e.. Digitization time(mainly shaping time)<1 μsTiming measurement::To determine event time and event vertex.dynamic range:0~500ns.resolution:<500 psMuon detector:-Water pool: Same requirements as neutrino detector-Water Tracker: Hit and/or chargeRPC:BESIIelectronics57th高能物理学会大会.李小男，高能物理研究所
7 th 高能物理学会大会, 李小男, 高能物理研究所 5 Requirements of readout electronics • Readout board designed for all detector systems except RPC. • Neutrino detector: – Charge measurement • Dynamic range for each PMT: 0 PE - 500 PE – 50 p.e is the maximum for a neutrino event – ~500 p.e. for through-going muons • resolution: <10% @ 1 p.e, 0.025%@ 400 p.e. • Noise < 0.1 p.e. • Digitization time(mainly shaping time) < 1 s – Timing measurement: • To determine event time and event vertex • dynamic range: 0 ~ 500 ns • resolution: < 500 ps • Muon detector: – Water pool: Same requirements as neutrino detector – Water Tracker: Hit and/or charge • RPC: BESIII electronics