Niels Bohr Institutet > Kalender - det sker på NBI > 2009 > Development of CMOS pi...

Development of CMOS pixel sensors for charged particle tracking

Seminar by Prof. Marc Winter, Institut de Recherches Subatomiques, Strasbourg (IRES)

ABSTRACT :

CMOS pixel sensors are developed at IPHC-Strasbourg since a decade, mainly driven by the needs for a vertex detector at the ILC offering unprecedented tagging performances. These sensors are particularly attractive for their high granularity and low material budget, combined with the possibility to integrate their front-end electronics in the same substrate as their sensitive volume. This detection technique has been validated via numerous prototypes and is presently used in several track telescopes where it allows for particularly high hit rates. If has also numerous spin-offs in particle imaging.

In the last year, the first column parallel sensor with integrated zero-suppression has been designed and fabricated in collaboration with IRFU/Saclay. Its architecture features in-pixel amplification and correlated double sampling, complemented with integrated signal discrimination. It was recently validated for equipping upcoming and future vertex detectors (e.g. STAR upgrade at RHIC, CBM experiment at FAIR).

The talk will provide an overview of the main features of the sensors, of their achieved performances and of their planned and potential applications. The trend of the R&D in the coming 2-3 years will be discussed, highlighting the emergence of fabrication processes featuring a depleted sensitive volume and the evolution of present 2D sensors towards 3D devices composed of a stack of vertically integrated micro-circuit tiers. This main topic of the seminar will be complemented with a short overview of the developement of an ultra-light, double-sided, ladder featuring a total material budget a few per-mill only.