Speaker
Description
MiniCactus V2 is a demonstrator intended to study the timing performance that can be obtained from non amplified large electrode CMOS sensors developed with the 150 nm LFoundry HV CMOS LF15A technology.
MiniCactus V2 is the most recent iteration of a line of timing oriented sensors, with improved performance over its predecessors. It features pixels of different sizes, from 1mm x 1mm to 0.5 mm x 0.5mm. The pixels are equipped with different types of analog individual front-end and discriminators, with bias parameters and thresholds programmable via an integrated slow control.
MiniCactus V2 has been tested on three testbeam periods during the last two years. The first and second period using high energy muons, in parasitic mode during DRD1 testbeam campaigns. The third period was at the beginning of October 2025, as part of a DRD3 testbeam campaign. The beamline was equipped on the three periods with timing detectors allowing a precise and reliable measurement of the time resolution of the individual pixels of the MiniCactus V2 chip. For the DRD3 beam period, the beamline was also equipped with a silicon tracker allowing precise extrapolation of the tracks to the sensor.
This talk will focus on the most recent results from the third period. The data analysis shows that a time resolution of about 50 ps can be obtained on 0.5 x 0.5 mm pixels with a tracking efficiency close to 99%.