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The Beamscope Cryogenic Silicon Beam Tracker of NA60 Peter Rosinský, Bratislava/CERN Vertex ’2002 workshop.

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Presentation on theme: "The Beamscope Cryogenic Silicon Beam Tracker of NA60 Peter Rosinský, Bratislava/CERN Vertex ’2002 workshop."— Presentation transcript:

1 The Beamscope Cryogenic Silicon Beam Tracker of NA60 Peter Rosinský, Bratislava/CERN Vertex ’2002 workshop

2 Lisbon CERN Bern Torino Yerevan Cagliari Lyon Clermont Brookhaven RIKEN R. Arnaldi, A. Baldit, K. Banicz, K. Borer, L. Casagrande, J. Castor, B. Chaurand, W. Chen, E. Chesi, B. Cheynis, C. Cicalò, P. Cortese, V. Danielyan, A. David, A. De Falco, N. De Marco, A. Devaux, B. Dezillie, L. Ducroux, H. En’yo, B. Espagnon, M. Floris, P. Force, E. Gangler, V. Granata, A. Grigorian, S. Grigorian, J.Y. Grossiord, A. Guichard, H. Gulkanian, R. Hakobyan, E. Heijne, M. Hess, J. Heuser, P. Jarron, M. Keil, L. Kluberg, B. Lenkeit, Z. Li, C. Lourenço, J. Lozano, M.P. Macciotta, F. Manso, D. Marras, A. Masoni, S. Mehrabyan, H. Muller, A. Musso, A. Neves, H. Ohnishi, S. Popescu, G. Puddu, E. Radermacher, P. Ramalhete, P. Rosinsky, P. Saturnini, E. Scomparin, J. Seixas, S. Serci, R. Shahoyan, E. Siddi, P. Sonderegger, G. Usai, G. Vandoni, H. Vardanyan and H. Wöhri Study of Prompt Dimuon and Charm Production with Proton and Heavy Ion Beams

3 Intermediate mass region thermal production ? Rapp, Shuryak, PLB473, ‘00 thermal production ? Rapp, Shuryak, PLB473, ‘00 open charm ? NA50 QM’99 open charm ? NA50 QM’99 A-A: NA60: D tagging NA38/NA50: excess ~3.5x for central

4 NA60 detectors Beamscope primary vertex, beam tracking ultra rad hard Lazarus effect Beamscope primary vertex, beam tracking ultra rad hard Lazarus effect ~1m MWPC’s Trigger Hodoscopes Toroidal Magnet Iron wall Muon filter ZDC Target area Zero Degree Calorimeter forward energy Zero Degree Calorimeter forward energy Muon Spectrometer selective dimuon trigger NA10/38/50 Muon Spectrometer selective dimuon trigger NA10/38/50 Pixel Telescope secondary vertices improved mass resolution Alice1 pixel chip Pixel Telescope secondary vertices improved mass resolution Alice1 pixel chip

5 Vertex Tracker Identification of D mesons (cc) secondary  vertex offset of ~100  m secondary vertex: Pixel Telescope primary vertex: Beamscope  tracking in the beam ! D  offset D-vertex - Vertex TelescopeabsorberMuon Spectro.

6 Requirements 1.Ultra radiation hardness ~6x10 12 p/day, ~6x10 11 i/day dose ~1Grad/day ?calc? should survive few weeks  tens of Grad 2.Fast readout, history buffer protons: 1 particle every 10 ns delayed trigger 3.Good position resolution ~10  m to determine offset of ~100  m 4.Small signal from protons special preamplification necessary (close to the sensor) Beam (SPS) protons (450 GeV): ~10 8 /s ions (In, Pb, 160 GeV): ~10 7 /s ?

7 backplane trigger Sensor single-sided silicon strip detector n-substrate, p + strips (Al/p + /n/n + /Al) 300  m thickness 24 small strips 50  m pitch ?20?  m width tracking 4 +4 wide strips 500  m pitch ?20?  m width beam steering guard ring

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