Typ

Artikel in einem Journal

Gebiet

Detektorentwicklung

Autor

A. Bamberger, K. Desch, U. Renz, M. Titov, N. Vlasov, P. Wienemann, A. Zwerger

Titel

Readout of GEM Detectors Using the Medipix2 CMOS Pixel Chip.

Datum

2006-11

Reportnummer

NIMA 573-3 (2007) 361-370

Kurzfassung

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/CO2 (70:30) and He/CO2 (70:30) mixtures and to achieve excellent spatial resolution for position reconstruction of primary clusters down to ~50 µm, based on the binary centroid determination method.

Journal

doi:10.1016/j.nima.2006.12.049