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T: Fachverband Teilchenphysik

T 55: Halbleiterdetektoren 1

T 55.8: Talk

Monday, March 9, 2009, 18:45–19:00, A125

Re-design of the ATLAS pixel detector for the insertable b-layer and Super-LHC upgrades (exchanged with T 55.5) — Claus Gößling, Jennifer Jentzsch, Reiner Klingenberg, Daniel Muenstermann, André Rummler, Georg Troska, •Tobias Wittig, and Renate Wunstorf — Experimentelle Physik IV, TU Dortmund, D-44221 Dortmund

The pixel detector is the innermost tracking detector of ATLAS which requires hermeticity to achieve good track reconstruction performance. Because the current sensor modules require an inactive safety margin around the active area, they have been shingled on top of each other’s edge which deteriorates the thermal performance and adds complexity in the present detector.

For the insertable b-layer (IBL) and the SLHC upgrade of ATLAS, a flat arrangement of sensors is anticipated. If the inactive edge is reduced from 1100 µ m to 100 µ m - 400 µ m (slim edge) the required hermeticity can be achieved. We conducted dicing trials close to the active area to determine how much of the safety margin can be safely omitted before and after irradiation; first results will be presented.

Besides, a prototype wafer design will be shown containing a possible IBL-sensor and other adapted sensor designs for the new read-out chip (FE-I4) as well as test structures for slim edge studies.