Speaker
Description
The DECAL sensor, a depleted monolithic active pixel sensor (DMAPS), is being developed as a possible technology for future digital calorimeters. For this application, the pixel size is required to be sufficiently small to avoid hit saturation and the number of pixels above threshold are counted to estimate the shower energy. The DECAL and DECAL Fully Depleted sensors have been designed and fabricated in the TowerJazz 180 nm CMOS standard and “modified” imaging process,
respectively. The latter contains modifications to the implants configuration that have demonstrated improved charge collection and radiation hardness, even to the levels required for barrel ECAL regions of FCC-hh (few 10$^{15}$ n$_{eq}$/cm$^2$ ). Both DECAL variants feature a matrix of 64x64 pixels with a pitch of 55 μm read out every 25 ns. For DECAL FD, the logic has been modified to have the in-pixel comparator threshold trim range extended from five to six bits, where the sixth bit is used to de-activate the comparator. The sensors can be reconfigured to function as either a binary short strip sensor, for particle tracking including as a pre-shower, or as a pad sensor, counting the number of pixels above threshold for digital calorimetry. The presentation contains characterisation results for both prototypes, including digital summing logic, analogue pixel performance, threshold scans under laser illumination and testing with radioactive
sources.
