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The Beamscope

The Beamscope. Cryogenic Silicon Beam Tracker of NA60. Peter Rosinsk ý, Bratislava / CERN. Vertex ’2002 workshop. Bern. CERN. Torino. Brookhaven. RIKEN. Lisbon. Yerevan. Clermont. Cagliari. Lyon. Study of Prompt Dimuon and Charm Production with Proton and Heavy Ion Beams.

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The Beamscope

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

  2. Bern CERN Torino Brookhaven RIKEN Lisbon Yerevan Clermont Cagliari Lyon Study of Prompt Dimuon and Charm Production with Proton and Heavy Ion Beams 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

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

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

  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 ! Vertex Telescope absorber Muon Spectro. Dm m offset D-vertex

  6. Requirements • Beam(SPS) • protons (450 GeV): ~108/s • ions (In, Pb, 160 GeV): ~107/s ? • 1. Ultra radiation hardness • ~6x1012 p/day, ~6x1011 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)

  7. 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 • backplane • trigger • 4 +4 wide strips • 500 m pitch • ?20?m width • beam steering • guard ring

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