A 20 kpixels CdTe photon-counting imager using XPAD chip

S. Basolo (1) , Jean-François Bérar (2) , Nathalie Boudet (2) , P. Breugnon (1) , B. Chantepie (1) , J.C. Clémens (1) , P. Delpierre (1) , B. Dinkespiler (1) , S. Hustache (3) , K. Medjoubi (3) , M. Ménouni (1) , C. Morel (1) , P. Pangaud (1) , E. Vigeolas (1)

1 CPPM - Centre de Physique des Particules de Marseille
2 NEEL - CRG - CRG & Grands instruments
3 SSOLEIL - Synchrotron SOLEIL

A 20 kpixels CdTe sensor has been hybridized on XPAD3S CMOS photon counting chips, forming a 19200 pixels imaging device. P-type CdTe with rectifying contact has been employed. This sensor works in hole collection mode with a pulse shaping time of about 150 ns. Detector construction and operation are described and first results obtained with 241Am source as well as diffraction images using an X-ray synchrotron beam are presented. Polarisation effects are present but remain at a very manageable level. Keywords: pixel detector, photon counting, CdTe, hole collection, XPAD3

Mots clés: Pixel detector; Photon counting; CdTe; Hole collection; XPAD3

Domaines: Instrumentations et Détecteurs [physics.ins-det]

S. Basolo, Jean-François Bérar, Nathalie Boudet, P. Breugnon, B. Chantepie, et al.. A 20 kpixels CdTe photon-counting imager using XPAD chip. Nuclear Instruments and Methods in Physics Research Section A: Accelerators, Spectrometers, Detectors and Associated Equipment, 2008, 589, pp.268-274. ⟨10.1016/j.nima.2008.02.042⟩. ⟨in2p3-00260076⟩