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T: Fachverband Teilchenphysik

T 60: Halbleiterdetektoren III

T 60.9: Vortrag

Mittwoch, 17. März 2010, 16:00–16:15, HG V

Reduction of inactive edges of planar ATLAS pixel sensors for the IBL and Super-LHC upgrades — Claus Gößling, Jennifer Jentzsch, Reiner Klingenberg, Daniel Muenstermann, André Rummler, •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 level of 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 especially after irradiation up to SLHC fluences; results of these investigations will be presented.

Furthermore, a prototype wafer has been produced which contains first planar pixel sensors for the new read-out chip (FE-I4) and special test structures for slim edge studies. Comparisons to the preceding dicing trials will be shown.