Frankfurt 2014 – scientific programme

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HK: Fachverband Physik der Hadronen und Kerne

HK 50: Instrumentierung

HK 50.7: Talk

Thursday, March 20, 2014, 18:30–18:45, HZ 8

MIMOSA-26 Calibration and Noise Measurement Based on the Digital Sensor Output — •Borislav Milanovic for the CBM-MVD collaboration — Goethe Uni Frankfurt

CMOS Monolithic Active Pixel Sensors (MAPS) are used for high-precision tracking in particle detectors. They are applied for the STAR detector and also considered for the future CBM and ALICE experiments. MAPS combine high detection efficiency (> 99 %), with ultra-low material budget (thinned to 50 µm) and low power consumption (ca. 250 mW/cm²). Their main feature is an integrated digital readout circuit situated directly on-chip. MIMOSA-26, developed at the IPHC Strasbourg, represents the basis of a modern MAPS. The sensor allows programming and slow control via JTAG. Sensitivity to impinging particles can be easily modified by changing the internal JTAG registers. However, the sensors require a careful tuning of run-time parameters, e.g. thresholds for the on-chip discriminators to guarantee a high detection efficiency and a low fake hit occupancy, i,e, electronic noise. This contribution presents a systematic study of the sensor/pixel response to noise allowing for a sensor characterization, calibration and selection prior to integration. This work is supported by BMBF (05P12RFFC7), HIC for FAIR, and GSI.