Astronomy and Astrophysics – Astrophysics
Scientific paper
Apr 2002
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=2002aps..aprc14009g&link_type=abstract
American Physical Society, April Meeting, Jointly Sponsored with the High Energy Astrophysics Division (HEAD) of the American As
Astronomy and Astrophysics
Astrophysics
Scientific paper
The CMS experiment at LHC strongly relies on the precise tracking capability of the detector. With luminosities up to 10^34 cm-2 s-1 the super-imposition of typically 20 to 30 unrelated minimum bias events are foreseen within each bunch crossing, and thus a pixel detector as close as possible to the beam line is necessary for improving pattern recognition. The pixel arrays will be arranged in a barrel of two layers and four forward disks, two at each end, for high eta coverage. After six years of operation a total fluence up to 6x10^14 hadron/cm^2 will be integrated at a radius of 6 cm resulting in a full depletion voltage above 600V and a leakage current of few nA/pixel. An operational voltage of at least 300V without signs of breakdown is required to maintain good performance up to these fluences. Recent studies of prototype sensors, both oxygenated and not oxygenated, exposed to a fluence of 1x10^14, 6x10^14, and 1x10^15 neutron/cm^2 are presented. DC electrical characteristics before and after irradiation, at different temperatures and for different designs are compared and a design that fulfills the given requirements is chosen and described. A new optimized sensor design based on the experimental result is also presented. This design has already been submitted to the manufacturer for the final prototype phase.
Bolla Gino
Bortoletto Daniela
Giolo Kim
Rott Carsten
Roy Amit
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