Lessons learned from BaBar silicon vertex tracker, limits and future perspectives of the detector

V. Re, M. Bruinsma, S. Curry, D. Kirkby, J. Berryhill, S. Burke, D. Callahan, C. Campagnari, B. Dahmes, D. Hale, P. Hart, S. Kyre, S. Levy, O. Long, M. Mazur, J. Richman, J. Stoner, W. Verkerke, T. Beck, A. M. EisnerJ. Kroseberg, W. S. Lockman, G. Nesom, A. Seiden, P. Spradlin, W. Walkowiak, M. Wilson, C. Bozzi, G. Cibinetto, L. Piemontese, A. B. Breon, D. Brown, E. Charles, A. R. Clark, S. Dardin, F. Goozen, L. T. Kerth, A. Gritsan, G. Lynch, A. Perazzo, N. A. Roe, G. Zizka, V. Lillard, D. Roberts, A. Lazzaro, F. Palombo, L. Ratti, P. F. Manfredi, E. Mandelli, C. Angelini, G. Batignani, S. Bettarini, M. Bondioli, F. Bosi, F. Bucci, G. Calderini, M. Carpinelli, M. Ceccanti, F. Forti, M. A. Giorgi, A. Lusiani, P. Mammini, G. Marchiori, M. Morganti, F. Morsani, N. Neri, E. Paoloni, A. Profeti, M. Rama, G. Rizzo, G. Simi, J. Walsh, P. Elmer, P. Burchat, A. J. Edwards, S. Majewski, B. A. Petersen, C. Roat, M. Bona, F. Bianchi, D. Gamba, P. Trapani, L. Bosisio, C. Cartaro, F. Cossutti, G. Della Ricca, S. Dittongo, L. Lanceri, S. Grancagnolo, L. Vitale, M. Datta, A. Mihalyi

Research output: Contribution to journalConference articlepeer-review


The Silicon Vertex Tracker (SVT) of the BABAR experiment at PEP-II is described. This is the crucial device for the measurement of the B meson decay vertices to extract CP-asymmetries. It consists of five layers of double-sided AC-coupled Silicon strip detectors, read out by a full-custom integrated circuit, capable of simultaneous acquisition, digitization and transmission of data. It represents the core of the BABAR tracking system, providing position measurements with a precision of 10 μm (inner layers) and 30 μm (outer layers). The relevant performances of the SVT are presented, and the experience acquired during the construction, installation and the first five years of data-taking is described. Innovative solutions are highlighted, like the sophisticated alignment procedure, imposed by the design of the silicon tracker, integrated in the beam-line elements and mechanically separated from the other parts of BABAR. The harshness of the background conditions in the interaction region required several studies on the radiation damage of the sensors and the front-end chips, whose results are presented. Over the next five years the luminosity is predicted to increase by a factor three, leading to radiation and occupancy levels significantly exceeding the detector design. Extrapolation of future radiation doses and occupancies is shown together with the expected detector performance and lifetime. Upgrade scenarios to deal with the increased luminosity and backgrounds are discussed.

Original languageEnglish (US)
Article numberN26-6
Pages (from-to)1183-1187
Number of pages5
JournalIEEE Nuclear Science Symposium Conference Record
StatePublished - 2004
Event2004 Nuclear Science Symposium, Medical Imaging Conference, Symposium on Nuclear Power Systems and the 14th International Workshop on Room Temperature Semiconductor X- and Gamma- Ray Detectors - Rome, Italy
Duration: Oct 16 2004Oct 22 2004

All Science Journal Classification (ASJC) codes

  • Radiation
  • Nuclear and High Energy Physics
  • Radiology Nuclear Medicine and imaging


  • Radiation damage
  • Silicon detector


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