Bonn 2010 – wissenschaftliches Programm
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)