Antoine Cazes - opera

Antoine Cazes - opera

Experience fromAntoine CazesLaboratori Nazionali di FrascatinuFact’08ValenciaJuly 3 rd , 2008

ν τ detectionν ττ −ν τν μμ − , e − , h,(3h)•56 lead plates, 57 emulsion films, 2changeable sheet.•Resolution : 2mm, 2mrad•10X0hhLongevent(40%)Shortevent(60%)

The target Tracker6.7mWLS fiberphoton•2×31 plans•4 × 64 strips in Xand in Y•Made by Karkov•Calibrated with LED•PM HamamatsuH7546 à 64 channels•OPERA ROCAntoine CazesnuFact’08 – july 3 rd 2008

First wall installedSide view of the first SuperModule(empty)Antoine CazesnuFact’08 – july 3 rd 2008

The spectrometers•2300 vertical drifttubes•2 × 6 stations•7,9m high•Resolution: 350μmBBAntoine CazesBobines•2 coils make a dipole of 1,55T•2×12 iron planes (5cm thick)•2×11 RPC planes (Resistive Plate Chamber)nuFact’08 – july 3 rd 2008

Emulsion reconstruction• Real time analysis: severaltens of bricks scanned/day• High speed (20 cm2/h) fullyautomatic scanning systems(one order of magnitudefaster than previousgeneration)• 16 pictures at differente depthin one emulsion layer : 3Dreconstruction50×50μm²Antoine Cazes• Independent R&D in Europe and Japanbased on different approaches– European system• Successfully running since Summer 2004with high efficiency (>90%), high purity (~2tracks/ cm2 /angle) and design speed• 2 mrad accuracy at small incident angles– Japanese system• Fast CCD camera (3 k frames/sec)• Continuous movement of the X-Y stagenuFact’08 – july 3 rd 2008• 52 cm2/h

Brick Assembly Machine• Bricks have to be producedautomatically• Very tight tolerances• Working in a dark room.• Speed ~700 bricks/dayBAM wrappingsection• 8 multidirectional arms for pilling• 1 multidirectional arms for wrapping.• Add the changeable sheet box, bar code, etc…• Main difficulties–Stickiness of lead/emulsion pile–Flatness of emulsionsAntoine CazesnuFact’08 – july 3 rd 2008

Brick insertion• Insertion in the detector with 2 robots(Brick Manipulating System, Annecy)– Push the bricks inside the walls– Ventouse Vehicle able to pull out thebricks• ~140.000 bricks inside OPERA• Filling ends mid-july 2008• Main difficulties– The detector is changing every day!– Book keeping important (Dada Base)Antoine CazesnuFact’08 – july 3 rd 2008

Brick production and fillingSide view of the firstSuperModule (full)~1.5 years for OPERA.This is long process !Antoine CazesnuFact’08 – july 3 rd 2008

General schema for Brick handlingAntoine CazesnuFact’08 – july 3 rd 2008

Brick FindingAntoine CazesnuFact’08 – july 3 rd 2008

Brick FindingEnergy flow. YZ projection• Two steps– Localization of the wall (z)– Localization inside one wall (xy)• Tool– Track reconstruction– Event classification → different NN• CC/NC• QE/DIS– 4 Neural Networks• Input :• Output:–Energy flow / shower profile–Brick map–Trained to deal with back scaterring–Brick position–probabilityWall 5 Tray 24 Cell 6 prob= 0.9Wall 6 Tray 24 Cell 6 prob= 0.09Antoine CazesnuFact’08 – july 3 rd 2008

Momentum reconstruction• Kalman Filter (X,Y, Px/Pz, Py/Pz, q/P):• Initialization of the fit.– Tracks stopping inside the detector– Tracks passing through one spectro– Tracks exiting by the side.–Cosmic• Resolution about 15% up to 30GeVAntoine CazesnuFact’08 – july 3 rd 2008

Conclusion• OPERA is taking data now• First beam october’07, allowed a first test (38 event)– Track reconstruction– Brick finding– Connection to the brick– Scanning• The 2008 run will produce the first physics results ofOPERA.• OPERA proved the possibility of producing emulsiondetector at the kiloton scale• See next presentations for new idea of magnetizeddetector.Antoine CazesnuFact’08 – july 3 rd 2008

More magazines by this user
Similar magazines