PHOBOS silicon pad sensors

Birger Back, Russell Betts, Markus Friedl, Rudolf Ganz, Kristjan H. Gulbrandsen, Burt Holzman, Wojtek Kucewicz, Willis T. Lin, Johannes Mülmenstädt, Gerrit J. Van Nieuwenhuizen, Rachid Nouicer, Heinz Pernegger, Michael Reuter, Pradeep Sarin, Vincent Tsay, Carla M. Vale, Bernard Wadsworth, Alan Wuosmaa, Bolek Wyslouch

Research output: Contribution to journalConference articlepeer-review

15 Scopus citations


PHOBOS is one of the four experiments at the Relativistic Heavy Ion Collider at Brookhaven National Laboratory. PHOBOS utilizes silicon sensors to measure charged particle multiplicity distributions and to track particles in a 2-arm spectrometer. The detector consists of 450 silicon pad sensors. Nine different pad geometries are used to match the different physics needs of the experiment. A relatively high granularity, of up to 1536 channels per sensor, is used in the spectrometer. The multiplicity detector uses 128 and 64 channel sensors and the charge deposition per pad is measured to determine the multiplicity of single events. All sensors are of the double-metal silicon pad type with pad sizes from 1 up to 4 cm2. They are produced in Taiwan by the ERSO foundry under supervision of Miracle Co. and National Central University. An extensive testing procedure makes it possible to select sensors suited for use in PHOBOS. Detector modules consisting of up to 5 sensors are read out with integrated chips of either 64 or 128 channels. The test results of the sensors and the performance of the assembled detector modules are discussed.

Original languageEnglish
Pages (from-to)257-263
Number of pages7
JournalNuclear Instruments and Methods in Physics Research, Section A: Accelerators, Spectrometers, Detectors and Associated Equipment
Issue number1
StatePublished - 1 Jun 2000
EventVERTEX '99: 8th International Workshop on Vertex Detectors - Texel, Neth
Duration: 20 Jun 199925 Jun 1999


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