Abstract
High performance DMAPS (Depleted Monolithic Active Pixel Sensor) for hadrontherapy. "This project aims to significantly improve the capabilities of the pixel tracker in a fixed target experiment, particularly in terms of the amount of data that can be collected for the same amount of time and spatial resolution, which for obvious statistical reasons allows for greater accuracy on the measurements, in order to improve the knowledge of the fragmentation cross section used for hadrotherapy. We will replace the sensors used till now in the vertex of the FOOT experiment with those of the next 'generation' (the MIMOSIS sensor), with integration times approximately 40 times shorter in order improve the overall capabilities of the experiment. The sensor is currently available, and the techniques for using it are already fully in the hands of the involved teams. Finally, the new Vertex Detector that will be constructed using the new sensors should also be able to cope with measurements for much heavier nuclei such as Fe56, which is of considerable importance for the studies of radio protection in space, fundamental for the planning of future deep space missions." "The main feature that distinguishes the MIMOSIS sensor from the sensors currently used in FOOT is the temporal resolution of 5 μs with respect to the present 185.6 μs frame readout time. Therefore, the MIMOSIS sensor is about 37 times “faster”. Moreover, the digital reading logic based on the priority encoder and ""elastic"" reading buffers allow a capacity of 0.7 Mhits/s × mm2 at peak and ability to handle larger fluctuations in the data stream. The new MIMOSIS sensor has a larger active area of 31.5 x 13.5 mm2 with respect to the previous sensors of 19.2 x 19.8 mm2. To cover at least the current angular phase space, two sensors for each plane are required. The two sensors will be glued on the two sides of the printed circuit board, overlapping on a central line in correspondence of the hole center provided in the same printed circuit board. The PCB hole will be open below the entire active area of the two sensors to minimize the material to be crossed by particles. The sensors will however, for the same reason, be thinned to a thickness of 50 μm. In this geometrical configuration the acceptance of the new VTX detector would be increased to 31.5 mm compared to the current 19 mm. In the other direction the size of the sensitive zone would increase, assuming an overlap of the active area of about 1 mm, to about 26 mm (12.5+12.5 mm+1mm of superimposition). Moreover, the increased pixel size, from a pitch of 20.7 μm to 26.88 μm in one direction and 30.24 μm in the other, will produce a reduction in the spatial resolution of the tracking, which is currently of the order of a few micrometres."
Project details
Unibo Team Leader: Sara Valentinetti
Unibo involved Department/s:
Dipartimento di Fisica e Astronomia "Augusto Righi"
Coordinator:
INFN-Istituto Nazionale di Fisica Nucleare(Italy)
Total Unibo Contribution: Euro (EUR) 82.522,00
Project Duration in months: 24
Start Date:
28/09/2023
End Date:
28/02/2026
