Readout of GEM Detectors Using the Medipix2 CMOS Pixel Chip

Details Readout of GEM Detectors Using the Medipix2 CMOS Pixel Chip Readout of GEM Detectors Using the Medipix2 CMOS Pixel Chip

2006-11-23

arxiv.org/abs/physics/0611229v1

Nucl.Instrum.Meth.A573:361-370,2007

Physics

Instrumentation and Detectors

18 pages, 14 pictures. submitted to Nuclear Instruments and Methods in Physics Research A

Scientific paper

10.1016/j.nima.2006.12.049

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 $^{55}$Fe X-rays and electrons from $^{106}$Ru. 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 $Ar/CO_2$ (70:30) and $He/CO_2$ (70:30) mixtures and to achieve excellent spatial resolution for position reconstruction of primary clusters down to $\sim 50 \mu m$, based on the binary centroid determination method.

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