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OPERA Precision Tracker

t. 1 mm. t. n. Pb. Emulsion layers. Belgium IIHE(ULB-VUB) Brussels. Bulgaria Sofia University. China IHEP Beijing, Shandong. Croatia Zagreb University. France LAPP Annecy, IPNL Lyon, LAL Orsay, IRES Strasbourg. Germany Berlin, Hagen, Hamburg, Münster, Rostock. Israel

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OPERA Precision Tracker

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  1. t 1 mm t n Pb Emulsion layers Belgium IIHE(ULB-VUB) Brussels Bulgaria SofiaUniversity China IHEP Beijing, Shandong Croatia Zagreb University France LAPP Annecy, IPNL Lyon, LAL Orsay, IRES Strasbourg Germany Berlin, Hagen, Hamburg, Münster, Rostock Israel Technion Haifa Italy Bari, Bologna, LNF Frascati, L’Aquila, LNGS, Naples, Padova, Rome, Salerno Japan Aichi, Toho, Kobe, Nagoya, Utsunomiya Russia INR Moscow, ITEP Moscow, JINR Dubna, Obninsk Switzerland Bern, Neuchâtel Turkey METU Ankara OPERA Precision Tracker Goals of OPERA Status νμ→ντoscillation Hamburg – Precision Tracker • prove of ντappearance νμ→ντoscillation • chance to measure θ13 if it is near the present limit • Goals: • - μ-identification • momentum measurement • measurement of the μ charge for background rejection Y. Ashie et al. SK collaboration hep-ex/0404034 • so far only disappearance observed, appearance needed • best fit value of Δm2from the new analysis of Superkamiokande (high L/E): 2.4 x 10-3 eV2 (old analysis: 2.0x10-3eV2) • best fit value for sin2(2θ): 1 (maximal mixing) • 90% C.L. range: Δm2 = 1.9 - 3.0 x 10-3 eV2 , sin2(2θ) > 0.9 Supermodul(SM) 1 Supermodul(SM) 2 • Requirements on the precision tracker: • 99% efficiency • spatial resolution < 300 μm Magnets with B≈1,55T CNGS Neutrino Beam CNGS beam • νμ beam from CERN to Gran Sasso • νμ flux 4.5x1019 pot/year • beam composition: ντνμνe • energy spectrum optimised for ντappearance at OPERA, <Eν> = 17GeV Gran Sasso underground laboratory • Precision Tracker(PT): • - first 8m drift tubes without wire support world wide • 6 layers per SM • 4 planes per layer • a total of 10000 drifttubes Prototype modules in operation in Hamburg νμbeam Muon spectrometer 2kton of lead Schedule: Small test setup in Hamburg Supermodule The OPERA detector 2004: starting phase in August if possible: first 20 modules ready end of 2004 2005: full mass production (60 modules) start of installation in GS (80 modules) commissioning of the system 2006: production of the rest (16 modules) installation of the rest (16 modules) in GS commissioning Assembling and alignment setup at DESY-Hamburg • Design: • Emulsion Cloud Chamber(ECC) detector • sandwich of nuclear emulsion and lead • 50 layers in every brick • 2 SM with 31 brick walls each • electronic trackers between the brick wall will localise an event • a total of 235000 bricks • μ-spectrometer consists of magnets and tracking system Vertex brick CNGS project on schedule ! ECC OPERA workgroup in Hamburg μ-spectrometer OPERA Collaboration OPERA performance • Analysis: • extraction of vertex brick • development of nuclear emulsions • automated scanning for vertex and kink topology with CCD camera • 3d images of events are created Expected number of signal and background events under the assumption of full mixing in five years with a neutrino flux of 4.5x1019 pot/year. Signature of ντevent: Main background sources: Collaboration meating in Hamburg, Juni 2004 - Very short decay length of τ leads to prominent kink topology

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