Trails, tracks and vectors: submicron precision with the silicon Medipix detector in the H6 beam

by Heijne, E. (CERN PH/DI)

Friday 27 Oct 2006, 11:00 → 12:00 Europe/Zurich

13/2-005 (CERN)

A silicon pixel detector with square 55µm pixels on a 300µm thick chip usually is placed perpendicular to the particles to be measured. However, in this experiment it has been positioned parallel to the beam and many tracks travel through all 256 pixels. First this shows that in 55µm of Si sufficient signal charge is generated for 100% efficient detection. But with the low signal threshold setting (800e-) one observes adjacent hits when the particle is near (<4µm) to the border between pixels. This allows to determine the direction of the particle to better than 1 mradian, and provides some coordinates to 0.05µm accuracy. Finally, also some complete pion interactions are contained within the Medipix matrix, so that this acts as a hodoscope, a target and analyzing detector at the same time. Some directions for R&D will be indicated that may allow using pixel detectors this way in future experiments.

Organiser(s): Ariella Cattai / PH

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