| Article ID | Journal | Published Year | Pages | File Type |
|---|---|---|---|---|
| 1831658 | Nuclear Instruments and Methods in Physics Research Section A: Accelerators, Spectrometers, Detectors and Associated Equipment | 2007 | 10 Pages |
We have operated a Medipix2 CMOS readout chip, with amplifying, shaping and charge discriminating front-end electronics integrated on the pixel level, as a highly segmented direct charge collecting anode in a Three-Stage Gas Electron Multiplier (Triple-GEM) to detect the ionization from 55Fe X-rays and electrons from 106Ru. The device allows to perform moderate energy spectroscopy measurements (20% FWHM at 5.9 keV X -rays) using only digital readout and two discriminator thresholds. Being a truly 2D detector, it allows to observe individual clusters of minimum ionizing charged particles in Ar/CO2Ar/CO2 (70:30) and He/CO2He/CO2 (70:30) mixtures and to achieve excellent spatial resolution for position reconstruction of primary clusters down to ∼50μm, based on the binary centroid determination method.
