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Current Status of The OPERA Experiment

Current Status of The OPERA Experiment. ( O scillation P roject with E mulsion t R acking A pparatus). Kunihiro Morishima morishima@flab.phys.nagoya-u.ac.jp Nagoya university On behalf of OPERA collaboration. NNN08. The OPERA Experiment Motivation and Conceptual Design.

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Current Status of The OPERA Experiment

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  1. Current Status of The OPERA Experiment (Oscillation Project with Emulsion tRacking Apparatus) Kunihiro Morishima morishima@flab.phys.nagoya-u.ac.jp Nagoya university On behalf of OPERA collaboration NNN08

  2. The OPERA ExperimentMotivation and Conceptual Design ・ OPERA(Oscillation Project with Emulsion tRackingApparatus)is a long baseline neutrino oscillation experiment ・ The goal of the experiment is to directly measure for the first time neutrino oscillation in an appearance mode ・ Using an almost pure νμbeam, the νμ→ντtransition is detected by observing the τ lepton decay, induced after a neutrino-lead CC interaction ・ τ lepton decay is observed by means of Emulsion CloudChambers ・ The detector is located on the CNGS (CERN to Gran Sasso) beam line at a distance from the neutrino source of 730 km

  3. conventional beam  ( m-2 / pot) 7.45x10-9  CC / pot / kton 5.44x10-17 < E > ( GeV ) 17 (e + e) /  0.85 %  /  2.0 % t prompt negligible The CNGS beam The beam is optimized for tappearance in the atmospheric oscillation region Δm232 = (2.43±0.13)×10-3 eV2 sin22θ23 = 1.0 CERN SPS 730km INFN Gran Sasso Institute

  4. Micrometric and milliradian resolution→ Emulsion Large Mass → Lead Target Trigger Neutrino Interaction → Target Tracker Identify muons and charge to reduce charm backgound → Spectrometer ECC Electronic Detector Principle of detecting tau neutrino nt Topology nt ～ 10-13 s cτ = 87 micron nt m-, e-, h- t- h h Hybrid Detector (Emulsion - Electronic Detectors)

  5. Neutrino t identification Target is divided in about 152000 ECC’s 1 mm 125mm 100mm Tau Decay t n Pb Emulsion layers 75.4mm II 10 X0 lead plate ECC （Emulsion Cloud Chamber） Piled up alternately Nuclear Emulsion (OPERA film) ～ 8.3 kg

  6. emulsion (44 μm) 50 micron plastic base (205 μm) Recorded as silver grain along the line particle passed through sensitivity : 36grains/100micron emulsion (44 μm) Microscopic Image position resolution ～ 50nm The OPERA film The OPERA Film Sub micron crystal 3D tracking device

  7. Tau Neutrino Interaction In ECCby DONUT

  8. Muon ID by electronic detector Sensitivity of tau neutrino detection Full mixing after 5 years run at 4.5x1019 pot / year Background sources: - Charm production and decays - Hadron re-interactions in lead - Large-angle muon scattering in lead

  9. Design of The OPERA Detector Super Module 1 Super Module 2 CNGS Beam 10m 20m 10m Target (ECC + Target Tracker) Spectrometer Located in Hall C - INFN Gran Sasso Institute

  10. The OPERA Detector - overview - Emulsion - Counter Hybrid Detector ・ ECC （Brick Target） ・ Target Tracker ・ Spectrometer 　　　　＋ ・ Scanning System （Read-out Emulsion） SM 2 SM 1 Located in Hall C - INFN Gran Sasso Institute

  11. The OPERA detector Brick Target Target mass 1.35 kt ~150000 Bricks ~8 millions of nuclear Emulsion Brick filling is finished in July 2008: 5000 bricks more will be added at the end of 2008 once additional lead will be delivered

  12. The OPERA detector BAM （Brick Assembling Machine） Production of ECC Working in a dark room Speed ~700 bricks/day

  13. The OPERA detector BMS （Brick Manipulating System） Loading and Extraction of ECC

  14. The OPERA detector Electronic Detector Spectrometer Target Tracker

  15. The OPERA detector Target tracker • The main goals of the target tracker are the trigger on the neutrino events and the identification of the brick to be extracted and then analysed • It is made of plastic scintillator strips, each with a wavelength shifting fibre • The fibres are connected in groups of 64 to multi-anode Hamamatsu PMTs at both ends Spatial resolution ~0.8 cm (2.6 cm pitch) L. Scotto Lavina (INFN Napoli)

  16. The OPERA detector B B Spectrometer • The goal of the spectrometer is the momentum measurement and charge discrimination • In particular it is used to measure and identify muons, in order to reduce charm background • It is made by inner tracker (RPC planes) and precision tracker (Drift Tubes) in a 1.5 T magnetic field L. Scotto Lavina (INFN Napoli)

  17. The automated microscopes ~30 bricks will be daily extracted from the target and analyzed European scanning system S-UTS (Japan) Scanning speed: 72cm2/h Scanning speed: 20cm2/h Highspeed CMOS camera (3 kHz) Piezo-controlled objective lens Customized commercial optics and mechanics Hardware corded algorithm (FPGA) asynchronous DAQ software asynchronous DAQ software Central Data Base Data Base Data Base

  18. Today ! ～ 6.0E18 pot ～500 bricks already tagged (expected : 2200 bricks)

  19. 2008 Run : One Example of Neutrino Event

  20. extraction The most probable brick is detected by brick finding algorithm ν ECC CS Development → Scanning 2008 Run : One Example of Neutrino Event

  21. CS analysis by the Scanning Station The Scanning Station scans the whole surface of the two emulsion interfaces (CS) and selecting particle tracks found in both plates 2 plates CS result validates the brick, which is then sent to the developing facility

  22. Location of the neutrino interactionin ECC Predictions from the CS are followed back in the brick, looking for the position where the neutrino interaction occurred. Neutrino Beam ECC brick CS

  23. Vertex Reconstruction in ECC Tracks found in ECC Z Reconstructed track parameter at vertex VTX:(116213.5 51204.3 63617.2) X Y The vertex is confirmed and alldata are stored into the DB

  24. 2007 Run: a charm candidate ! Electromagnetic shower (15 GeV)

  25. Summary and Future The OPERA detector is taking data now OPERA proved the possibility of producing emulsion detector at the kiloton scale Stream of locating Neutrino Interactions is systematically running continuously. Now: run 2008 started since June 18th, 123 days of data taking Expected 2.28x1019 p.o.t. and 1 ntinteraction So far, collected 6x1018 p.o.t. The 2008 run will produce important results for OPERA : events for efficiency and BG estimates (charm,…) and maybe ~1 nt ???

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