研究目的
To evaluate the optical cross talk level in the SiPMs adopted in the ASTRI SST-2M Cherenkov Camera using EASIROC front-end electronics.
研究成果
Two independent methods gave comparable cross talk levels of 22%–24%. The ASTRI SST-2M prototype will be tested in the field at controlled temperatures, and more extensive measurements are in progress. Cross talk is a characteristic of the SiPM technology, with newer generations showing lower levels.
研究不足
Measurements were performed at room temperature without temperature control, which may not reflect real operating conditions. The cross talk levels are preliminary and may require further testing under controlled conditions.
1：Experimental Design and Method Selection:
Two methods were used to evaluate SiPM cross talk: one based on trigger rate scans in dark noise regime, and another based on pulse height distribution analysis.
2：Sample Selection and Data Sources:
Hamamatsu S11828-3344m SiPMs were used, operated at an over-voltage of
3：88 V. List of Experimental Equipment and Materials:
EASIROC front-end ASIC, Evaluation Board by Omega Micro, LabView software, SiPM detectors.
4：Experimental Procedures and Operational Workflow:
Measurements were performed at room temperature (~24°C) without temperature control. Data were accumulated for 10 seconds for trigger rate scans, and pulse height distributions were obtained with shaping time set to 50 ns.
5：Data Analysis Methods:
For method 1, cross talk was evaluated from the ratio of trigger rates at specific thresholds. For method 2, Gaussian fitting was applied to pulse height distributions to separate afterpulse and cross talk contributions.
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