C. Solans Sanchez,0,∗ P. Allport, I. Asensi Tortajada, D. Bortoletto, C. Buttar, R. Cardella, 5 F. Dachs, V. Dao, H. Denizli, M. Dyndal, L. Flores Sanz de Acedo, P. Freeman, A. Gabrielli, L. Gonella, K. Oyulmaz, H. Pernegger, P. Riedler, H. Sandaker, 5 A. Sharma, W. Snoeys, J. Torres Pais and S. Worm CERN, Switzerland University of Birmingham, United Kingdom Universidad de Valencia, Spain University of Oxford, United Kingdom University of Glasgow, United Kingdom 5 University of Oslo, Norway University of Vienna, Austria Bolu Abant Izzet Baysal University, Turkey DESY (Zeuthen), Germany

In this paper we describe the DECAL Monolithic Active Pixel Sensor (MAPS) for digital electromagnetic calorimetry. The sensor consists of a matrix of 64x64 55um pixels, and provides a readout at 40MHz of the number of particles which have struck the matrix in the preceding 25ns. It can be configured to report this as a total sum across the sensor (equivalent to the pad of an analogue calorimeter) or the sum per column (equivalent to a traditional strip detector). Design and operation of the sensor is described, and the results of chip characterisation are reported and compared to simulations. Keywords—CMOS Image Sensor, configurable, calorimetry, tracking

Charge Coupled Devices (CCDs) have been successfully used in several high energy physics experiments over the past two decades. Their high spatial resolution and thin sensitive layers make them an excellent tool for studying short-lived particles. The Linear Collider Flavour Identification (LCFI) Collaboration has been developing Column-Parallel CCDs for the vertex detector of a future Linear Collider which can be read out many times faster than standard CCDs. The most recent studies are of devices designed to reduce both the CCD's intergate capacitance and the clock voltages necessary to drive it. A comparative study of measured Charge Transfer Inefficiency values between our previous and new results for a range of operating temperatures is presented.