研究目的
To verify and commission the operation of the front-end electronics channels for the PADME charged particle detector system, ensuring efficiency better than 99% and time resolution below 1 ns.
研究成果
The front-end electronics of the PADME charged particle detector system were successfully tested, with all 256 channels meeting the time resolution requirement of better than 500 ps. The average resolution was around 280 ps, indicating the system is ready for operation. The dominant contribution to time resolution in actual use is expected from the scintillator and fibers, not the electronics.
研究不足
The test setup may not fully replicate the actual experimental conditions of the PADME experiment, such as beam interactions and background noise. Illumination equalization was not perfect, leading to variations in pulse amplitudes, and the study did not account for all factors like imperfect positioning or different break-down voltages of SiPMs.
1：Experimental Design and Method Selection:
A custom test setup was developed to test the performance of 256 front-end electronics channels using LED pulses to simulate light signals, with data acquisition and analysis methods to measure time resolution.
2：Sample Selection and Data Sources:
The samples consisted of 256 SiPM channels from the PADME detector system, tested under controlled illumination conditions.
3：List of Experimental Equipment and Materials:
LED driver, support structure (3D printed from PLA), controller module, CAEN V1742 digitizer modules, signal generator, DAQ PC, SiPMs (Hamamatsu S13360), and other electronic components.
4：Experimental Procedures and Operational Workflow:
The setup involved pulsing SiPMs with green LED light pulses of ~20 ns duration, recording waveforms with digitizers at 1 GS/s, triggering randomly, equalizing illumination, and analyzing data to reconstruct pulse times and compute time resolutions.
5：Data Analysis Methods:
Data was analyzed using the official PADME reconstruction software, with time reconstruction based on zero-crossing method (t0 = t20 – (t40 – t20)), and statistical analysis using least squares method to determine time resolutions from overdetermined systems of equations.
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