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30 results on '"Bonvicini, V."'

12. The DELPHI silicon strip microvertex detector with double sided readout

Author

Chabaud, V., Collins, P., Dijkstra, H., Gomez Cadenas, J.J., Keranen, R., Masciocchi, S., Trischuk, W., Weilhammer, P., Dufour, Y., Brenner, R., Orava, R., Osterberg, K., Ronnqvist, C., Saarikko, H., Saarikko, J.-P., Tuuva, T., Voutilainen, M., Błocki, J., Brückman, P., Godlewski, J., Jałocha, P., Kucewicz, W., Pałka, H., Zalewska, A., Bouquet, B., Couchot, F., D'Almagne, B., Fulda-Quenzer, F., Rebecchi, P., Allport, P.P., Booth, P.S.L., Cooke, P.A., Andreazza, A., Biffi, P., Bonvicini, V., Caccia, M., Meroni, C., Pindo, M., Redaelli, N., Troncon, C., Vegni, G., Cuevas Maestro, J., Barker, G.J., Bibby, J., Demaria, N., Flinn, M., Pattinson, P., Mazzucato, M., Nomerotski, A., Peisert, A., Stavitski, I., Baubillier, M., Rossel, F., Gandelman, M., Santos de Souza, S., Apsimon, R., Bates, M., Bizzell, J., Dauncey, P.D., Denton, L., Murray, W., Tyndel, M., Marco, J., Martinez-Rivero, C., Karlsson, M., and Hernando, J.A.

Abstract

The silicon strip microvertex detector of the DELPHI experiment at the CERN LEP collider has been recently upgraded from two coordinates (RΦ only) to three coordinates reconstruction (RΦ and z). The new Microvertex detector consists of 125 952 readout channels, and uses novel techniques to obtain the third coordinate. These include the use of AC coupled double sided silicon detectors with strips orthogonal to each other on opposite sides of the detector wafer. The routing of signals from the zstrips to the end of the detector modules is done with a second metal layer on the detector surface, thus keeping the material in the sensitive area to a minimum. Pairs of wafers are daisy chained, with the wafers within each pair flipped with respect to each other in order to minimize the load capacitance on the readout amplifiers. The design of the detector and its various components are described. Results on the performance of the new detector are presented, with special emphasis on alignment, intrinsic precision and impact parameter resolution. The new detector has been taking data since spring of 1994, performing up to design specifications.

Published
1996
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19. Silicon drift detector with a continuous implanted resistor as divider-drift electrode

Author

Rashevsky, A., Bonvicini, V., Vacchi, A., Zampa, N., Burger, P., Beole, S., Idzik, M., Petta, C., and Randazzo, N.

Abstract

The peculiarity of the drift chamber prototype presented in this paper is the high voltage divider, which is implanted in the entire sensitive zone, thus, it has at the same time the function of drift electrode. This brings some advantage:

Published
1998
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20. At the frontiers of digital mammography: SYRMEP

Author

Arfelli, F., Bonvicini, V., Bravin, A., Cantatore, G., Castelli, E., Dalla Palma, L., Di Michiel, M., Longo, R., Olivo, A., Pani, S., Pontoni, D., Poropat, P., Prest, M., Rashevsky, A., Tromba, G., Vacchi, A., and Vallazza, E.

Abstract

The SYRMEP (SYnchrotron Radiation for MEdical Physics) collaboration is presently taking data at a beamline at the synchrotron ELETTRA in Trieste to study the performances of a digital silicon pixel imaging system for mammography. Images are obtained with a scanning technique in the energy range 15–30keV. The readout electronics operates in a single photon counting mode with a photon rate of about 106/(mm2s), which is still 4 times lower than the maximum rate reachable with the present beamline configuration. Two different detector layouts have been designed, the first one consisting of a single-layer silicon microstrip detector positioned edge-on with respect to the beam, and the second innovative one represented by a matrix of these detectors stacked to cover the full beam dimension (100×4mm2). We present here the results obtained with a single-layer detector and a double-layer detector (both 5cm wide) with mammographic phantoms and human breast tissue.

Published
1998
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27. SYRMEP front-end and read-out electronics

Author

Arfelli, F, Bonvicini, V, Bravin, A, Cantatore, G, Castelli, E, Cristaudo, P, Michiel, M.Di, Longo, R, Olivo, A, Pani, S, Pontoni, D, Poropat, P, Prest, M, Rashevsky, A, Tomasini, F, Tromba, G, Vacchi, A, and Vallazza, E

Abstract

The SYRMEP approach to digital mammography implies the use of a monochromatic X-ray beam from a synchrotron source and a slot of superimposed silicon microstrip detectors as a scanning image receptor. The microstrips are read by 32-channel chips mounted on 7-layer hybrid circuits which receive control signals and operating voltages from a MASTER-SLAVE configuration of cards.

Published
1998
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