1 / 35

The OPERA Experiment 12 th Topical Seminar on Innovative Particle and Radiation Detectors ( IPRD10) 7-10 June 2010,

The OPERA Experiment 12 th Topical Seminar on Innovative Particle and Radiation Detectors ( IPRD10) 7-10 June 2010, Siena, Italy Jonas Knüsel Albert Einstein Center for Fundamental Physics Laboratory for High Energy Physics University of Berne

finley
Download Presentation

The OPERA Experiment 12 th Topical Seminar on Innovative Particle and Radiation Detectors ( IPRD10) 7-10 June 2010,

An Image/Link below is provided (as is) to download presentation Download Policy: Content on the Website is provided to you AS IS for your information and personal use and may not be sold / licensed / shared on other websites without getting consent from its author. Content is provided to you AS IS for your information and personal use only. Download presentation by click this link. While downloading, if for some reason you are not able to download a presentation, the publisher may have deleted the file from their server. During download, if you can't get a presentation, the file might be deleted by the publisher.

E N D

Presentation Transcript

  1. TheOPERAExperiment 12thTopical Seminar on Innovative Particle andRadiationDetectors (IPRD10) 7-10 June 2010, Siena, Italy Jonas Knüsel Albert Einstein Center for Fundamental Physics Laboratory for High Energy Physics University of Berne On behalf of the OPERA collaboration jonas.knuesel@lhep.unibe.ch

  2. jonas.knuesel@lhep.unibe.ch ThePhotographicEmulsion Technology of the OPERA Experiment on its Way to Find the → Oscillation OPERA OscillationProject withEmulsion tRackingApparatus

  3. jonas.knuesel@lhep.unibe.ch • Introduction • The OPERA experiment • Thenuclearemulsion technology • On the way to find the →oscillation • Conclusion New Journal of Physics (2006) 303a JINST 4 (2009) P06020 JINST 4 (2009) P06020

  4. LAPP Annecy IPNL Lyon IPHC Strasbourg Introduction The OPERA collaboration Hamburg Münster Rostock ULB Brussels IRB Zagreb Bern ETH Zurich INR, LPI, ITEP, SINP Moscow JINR Dubna Jinju Bari Bologna L’Aquila LNF Frascati LNGS Napoli Padova Roma Salerno Aichi Toho Kobe Nagoya Utsunomiya • 33 Institutions • ~200 physicist Technion Haifa METU Ankara

  5. jonas.knuesel@lhep.unibe.ch Introduction Physicsmotivation • Neutrinos as fundamental particles of the SM • Flavour vs. Mass Eigenstates: • Mixing • Oscillation! • Oscillationparameters: θ and ∆m2, available in experiment: L, E • Detection of Tau Neutrino from an oscillatedmuonneutrinovia the tau decaykink. • High target mass to compensatelowneutrino cross section: useLEAD • High granularity and resolution to seethe tau kink: usePHOTGRAPHIC EMULSIONS • Proveneutrinooscillationbyobservingthe Tau appearance.

  6. jonas.knuesel@lhep.unibe.ch ν μ, e, h, 3h Introduction Principle of topologicaldetection νt cτ = 87 micron τ- νt Topology Selection h h Also other topologies, according to decay: Tau decay kink

  7. jonas.knuesel@lhep.unibe.ch CERN 730 km LNGS The OPERA experiment From CERN to Gran Sasso Expected number of interactions in 5 years running: ~23600 nm CC + NC ~205 ne + ne CC ~115 nt CC (Dm2=2.5 x 10-3 eV2) ~ 10 tau decays are expected to be observed, with less than 1 background event

  8. The OPERA experiment The OPERA detector Dimension of the detector: 20m x 10m x 10m

  9. jonas.knuesel@lhep.unibe.ch Brick Wall and Brick Manipulation system. The OPERA experiment The OPERA detector scintillator bricks

  10. jonas.knuesel@lhep.unibe.ch 75.4mm 125mm OPERA emulsion film 8.3kg 10X0 Neutrino Beam Lead plate : 1mm 100mm The OPERA experiment The OPERA basicunit: the „brick“ The Emulsion Cloud Chamber (ECC) CSd 57 emulsion per brick • The OPERA emulsion film plays the main role in this experiment. • These emulsion films are scanned by automatic optical microscopes. • > 200000 m2 of emulsion surface in OPERA

  11. jonas.knuesel@lhep.unibe.ch The OPERA experiment Thescanningsystems Europe Japan ESS: (European Scanning System) SUTS (Super Ultra Track Selector) • Scanning speed/system: 20cm2/h • Customized commercial optics and mechanics • Asynchronous DAQ software • EU overall capacity: ~ 200 cm2/h • Scanning speed/system: 75cm2/h • High speed CCD camera (3 kHz) , Piezo-controlled objective lens • FPGA Hard-coded algorithms • Japan overall capacity: ~ 200 cm2/h

  12. jonas.knuesel@lhep.unibe.ch CSd  2 1 1 … 53 57 48 49 50 51 52 54 55 56 2 The OPERA experiment Thescanningprocedure • Scanback • Track follow-up film by film: • Alignment using cosmic ray tracks • Definition of the stopping point • Volume-Scan • Volume scanning (2-3 cm2) around the stopping point

  13. jonas.knuesel@lhep.unibe.ch The OPERA experiment Thescanninganalysis Different steps of the emulsion data processing Position residuals for the position alignment • All base-tracks in the 11 films • Long tracks for the alignment • Tracks belonging to the vertex ≈ 2 mm JINST 4 (2009) P04018

  14. jonas.knuesel@lhep.unibe.ch The OPERA experiment Fromthe m to themscale • Detector • Muon Spectrometer O (m)

  15. jonas.knuesel@lhep.unibe.ch The OPERA experiment Fromthe m to themscale • Target Tracker O (m)  O (cm)

  16. jonas.knuesel@lhep.unibe.ch The OPERA experiment Fromthe m to themscale • The ECC brick extraction O (m)  O (cm)

  17. jonas.knuesel@lhep.unibe.ch The OPERA experiment Fromthe m to themscale • The Changeable Sheet (CS) located on the brick O (m)  O (cm)  O (mm) CS: 2 emulsion film JINST 3 (2008) P07005

  18. jonas.knuesel@lhep.unibe.ch The OPERA experiment Fromthe m to themscale • CS confirmes prediction by electronic detectors. • Move from cm-range (electronic detector) to mm-range • Bricks are only developed after CS confirmes prediction emulsion film doublets O (m)  O (cm)  O (mm)

  19. jonas.knuesel@lhep.unibe.ch The OPERA experiment Fromthe m to themscale • The emulsion Thisisthe main part of the OPERA experiment. Theessentiallstuffhappenshere. Vertexfinding and topologyclassification. O (m)  O (cm)  O (mm)  O (mm) 1 cm 1 cm

  20. jonas.knuesel@lhep.unibe.ch Thenuclearemulsion technology Renaissance • The central part of OPERA happens in emulsion films: • AgBr Crystal, size ~ 0.2 microns • Semiconductor detector technique, band gap ~ 2.6eV • Signal amplified by developing the photographic films. • After developing the „silver grains“ are read out by optical microscopes Emulsion Layer (44micron) Plastic Base (205micron) Emulsion Layer

  21. jonas.knuesel@lhep.unibe.ch Recorded as silver grains along the line particle passed through 50 micron Microscopic Image Thenuclearemulsion technology Sub micron resolution 3D tracking cτ of tau: ~87 microns Resolution of 0.3 micron

  22. jonas.knuesel@lhep.unibe.ch Thenuclearemulsion technology Microscope images Nuclear emulsion image as seen by the microscope JINST 4 (2009) 6020 Peculiar event: neutrino interaction occured inside the emulsion layer

  23. jonas.knuesel@lhep.unibe.ch On the way to find thenm→ ntoscillation First OPERA run 2006 • Only electronic detectors, at that time: • No bricks in target, then. Cosmic muon induced background Muons from CNGS beam. Angle w.r.t. earth curvature: 3.4 degree. ✔ Neutrino beam ✔ Electronic detector New Journal of Physics 8 (2006) 303

  24. On the way to find thenm→ ntoscillation nm CC interaction secondary vertex 2 tracks with IP < 4 mm 7 mm primary vertex 4 tracks with IP < 2 mm muon 2.2 cm

  25. On the way to find thenm→ ntoscillation nm CC interaction y 6 Gammas reconstructed 4 Gammas from 1ry vtx 2 Gammas from 2ry vtx secondary vertex 2 tracks with IP < 4 mm 7 mm primary vertex 4 tracks with IP < 2 mm muon 2.2 cm

  26. jonas.knuesel@lhep.unibe.ch On the way to find thenm→ ntoscillation Charm candidates Charm topology analogous to tau (similar lifetime): reference sample for the decay finding efficiency • Thetakink: 0.204 rad • Pdaughter: 3.9 (+1.7 -0.9) GeV • PT: 800 MeV • Flight length: 3247.2 μm • 2 EM-showers point to vertex

  27. jonas.knuesel@lhep.unibe.ch On the way to find thenm→ ntoscillation Charm candidates Topology Kink Vee Trident 4Vee Observed events 5+2N1 5 1+N3 1 Event in Europe (D0 4 prong) Event in Japan (kink)

  28. jonas.knuesel@lhep.unibe.ch On the way to find thenm→ ntoscillation ne interaction 6 ne interactions found in a subsample of 690 CC located interaction (expected are about 6)

  29. jonas.knuesel@lhep.unibe.ch On the way to find thenm→ ntoscillation search for t • Search for nt is ongoing • Systematic decay studies are performed for all interactions • About 2 t are expected from 2008-2009 run • Channel Signal Background • t → m 2.9 0.17 • t→ e 3.5 0.17 • t→ h 3.1 0.24 • → 3h 0.9 0.17 • Total 10.4 0.75

  30. jonas.knuesel@lhep.unibe.ch On the way to find thenm→ ntoscillation work in progress... • CNGS run 2010 is going well (started on April 20th 2010) • Continuous extraction of bricks from triggered events • About 100 bricks / week are extracted, developed and sent to the labs • Systematic decay search studies are performed to find all possible decay topologies.

  31. jonas.knuesel@lhep.unibe.ch Conclusion • OPERA, the largest nuclear emulsion experiment is successfully taking data. • OPERA has collected for 5.3E19 pot in 2008 and 2009. • The full chain of events handling/analysis is proven. • Electronic detector performance is reliable and well understood. • Several charm events are found as expected. • The first t event is close...

  32. jonas.knuesel@lhep.unibe.ch

  33. jonas.knuesel@lhep.unibe.ch Additional Information 2008 run status (May 5th, 2010) • Decay search completed for 84.3% of the sample • 22 observed charm candidates

  34. jonas.knuesel@lhep.unibe.ch Additional Information 2009 run status (May 5th, 2010) • Decay search completed for 42.1% of the located event sample • 4 observed charm candidates

  35. jonas.knuesel@lhep.unibe.ch Additional Information Decay search – detect kink topology

More Related