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HK: Fachverband Physik der Hadronen und Kerne

HK 36: Postersitzung

HK 36.53: Poster

Mittwoch, 17. März 2010, 14:00–16:00, HG Aula

Random Telegraph Signal in x-ray and neutron irradiated Monolithic Active Pixel Sensors* — Melissa Domachowski¹, Dennis Doering¹, Sarah Ottersbach¹, •Michael Deveaux¹, Christian Müntz¹, Joachim Stroth¹, and Franz M. Wagner² — ¹Institut für Kernphysik Goethe Universität, Frankfurt am Main — ²Forschungsneutronenquelle Heinz-Maier-Leibnitz (FRM II), Technische Universität München

CMOS Monolithic Active Pixel Sensors (MAPS) provide an outstanding combination of excellent spatial resolution (few µ m) and very light, thin ( <0.05 % X₀) material budget. Their use is foreseen in the vertex detectors of various experiments in heavy ion and particle physics. Among them is CBM. In order to handle the harsh radiation doses expected in this experiment, the CBM-MVD collaboration undertakes intense R&D on the radiation hardness of MAPS.

A particular radiation damage effect observed in MAPS is Random Telegraph Signal (RTS), which manifests itself as a modulation of the dark signal of the sensors. The amplitude of this modulation may exceed the discrimination threshold of MAPS pixels. RTS is therefore likely to provide the dominant part of the dark rate of the CBM - Micro Vertex Detector. Our exploratory study aimed to estimate this dark rate for different sensors being irradiated with ionizing, non-ionizing and mixed radiation.
*supported by BMBF (06FY173l;06FY9099I) and GSI (F&E)