FADC Pulse Reconstruction Using a Digital Filter for the MAGIC Telescope

TL;DR

This paper introduces a digital filtering method for FADC data in the MAGIC Telescope, improving the extraction of signal charge and timing from Cherenkov light measurements.

Contribution

The paper presents a novel digital filtering technique that accounts for noise autocorrelation, enhancing signal reconstruction accuracy for Cherenkov light detection.

Findings

Digital filtering outperforms other algorithms in charge and timing accuracy.

The method effectively models pulse shape dominated by electronic shaper.

Performance comparisons demonstrate improved reconstruction quality.

Abstract

Presently, the MAGIC telescope uses a 300 MHz FADC system to sample the transmitted and shaped signals from the captured Cherenkov light of air showers. We describe a method of Digital Filtering of the FADC samples to extract the charge and the arrival time of the signal: Since the pulse shape is dominated by the electronic pulse shaper, a numerical fit can be applied to the FADC samples taking the noise autocorrelation into account. The achievable performance of the digital filter is presented and compared to other signal reconstruction algorithms.