1. Quality Assurance: double sided silicon sensors for the Silicon Tracking System
Pradeep Ghosh for the CBM Collaboration
Goethe-Universität, Frankfurt
GSI Helmholtzzentrum für Schwerionenforschung, Darmstadt

2. Silicon Tracking System
The Silicon Tracking System (STS) is the central detector of the Compressed Baryonic Matter (CBM) experiment. Its task is the standalone trajectory reconstruction of the high multiplicities of charged particles originating from high-rate beam-target interactions. The silicon microstrip detectors must be radiation hard and are red out by a fast self-triggering front-end electronics.
Si detectors
1272
6.2 × 6.2 cm2
648
4.2 × 6.2 cm2
452
2.2 × 6.2 cm2
172
sectors/modules
1040
ladders
106
r/o channels
2.1 M
r/o chips
16.6 k
r/o boards
2080
hub boards
180
CBM01
1st full-size prototype (2007)
close-up of a corner of double-sided microstrip detector CBM01 (thickness 300µm & strip pitch 58µm)
schematic view of silicon sensor with contacts pads & bias rail

3. Quality Assurance
Quality assurance for silicon sensor includes
Visual tests on arrival
Control & distribution to testing centers
Verification of specifications via tests
Electrical tests
Bulk IV & CV tests
Strip response
Inter-strip parameters
Radiation hardness tests
Bonding tests
Module tests
Central database for keeping track of sensor response
Probe station Zuess 3000
Top : IV Characteristics (left), Bias Resistance (right)
Bottom: Radiation Damage (left), Interstrip resistance (right)