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

V. Re, D. Kirkby, M. Bruinsma, S. Curry, 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, H.L. Snoek, D. Brown, E. Charles, S. Dardin, F. Goozen, L.T. Kerth, A. Gritsan, G. Lynch, N.A. Roe, C. Chen, C.K. Lae, W. Hulsbergen, 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, A. Perazzo, P. Burchat, A. Edwards, S. Majewski, B.A. Petersen, C. Roat, M. Bona, F. Bianchi, D. Gamba, P. Trapani, L. Bosisio, C. Cartaro, F. Cossuti, G. Della Ricca, S. Dittongo, S. Grancagnolo, L. Lanceri, L. Vitale, M. Datta, A. Mihalyi

Research output: Chapter in Book / Report / Conference proceedingConference contributionAcademicpeer-review

Abstract

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 charge-conjugation parity (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 high-lighted, like the sophisticated alignment procedure, imposed by the design of the silicon tracker, integrated in the beamline 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. © 2005 IEEE.
Original languageEnglish
Title of host publicationIEEE Transactions on Nuclear Science
Pages787-792
DOIs
Publication statusPublished - Jun 2005
Externally publishedYes

Publication series

NameIEEE Transactions on Nuclear Science

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