COMETH: a CMOS pixel sensor for a highly miniaturized high-flux radiation monitor

Jun 6, 2014, 2:40 PM
Berlagezaal (Beurs van Berlage)


Beurs van Berlage

Oral Sensors: 1b) Semiconductor Detectors I.b Semiconductors


Yang ZHOU (Institut Pluridisciplinaire Hubert Curien (FR))


The need for miniaturized and versatile real-time radiation monitors has become a general trend for spacecraft applications. It requires a highly integrated detection system with the ability to identify ion species in a high flux mixed environment. We have proposed [1] a new strategy to meet these requirements with a single CMOS pixel chip. This sensor is based on a matrix of 50×50 µm2 pixels, read out in rolling-shutter mode, and features columns ended by 3-bit ADCs with tunable threshold. An embedded digital algorithm extracts the particle properties from the hit information to provide the radiation flux on–line. A reduced scale prototype with 32×32 pixels and 32 column ADCs has been designed and fabricated in a 0.35 µm process. The layout of the identifying and counting algorithm, downstream the pixel matrix, was developed in the same process. A full simulation of this layout for a subset of columns was used to check the algorithm output against many inputs. Test results obtained with X-rays, ß- particles and laser illumination, confirm previous simulations addressing gain and linearity. Column ADCs also show expected features. Those measurements validate the possibility to monitor proton and electron fluxes up to 107 particles•cm-2•s-1 and distinguish proton from electron for energies lower than 50 MeV. [1] Y.Zhou et al., JINST 7 (2012) C12003. *COMETH: Counter for Monitoring the Energy and Type of charged particles in High flux

Primary authors

Christine Guo Hu (Institut Pluridisciplinaire Hubert Curien (FR)) Jerome Baudot (Institut Pluridisciplinaire Hubert Curien (FR)) Kimmo JAASKELAINEN (Institut Pluridisciplinaire Hubert Curien (FR)) Marc Winter (Institut Pluridisciplinaire Hubert Curien (FR)) Yang ZHOU (Institut Pluridisciplinaire Hubert Curien (FR)) Yongcai Hu (Institut Pluridisciplinaire Hubert Curien (FR))

Presentation materials