Calibration of Troitsk nu-mass detector readout electronics by signal digital filters

TL;DR

This paper details the calibration of detector readout electronics using digital filters to optimize noise reduction and energy resolution for neutrino detection experiments.

Contribution

It introduces a calibration method employing digital filters for silicon drift detector electronics in neutrino research.

Findings

Triangular and trapezoid digital filters improve noise performance.

Calibration with gamma sources validates filter effectiveness.

Signal differentiation options are under examination.

Abstract

We present the results of tuning and calibration of the detector electronics in the signal digitization mode. The goal of the experiment is to search for a possible sterile neutrino signature in tritium beta-decay. The read-out electronics work in direct oscilloscope mode, which requires to optimize time frame the with the goal to minimize noise and energy resolution. We use a 7-pixel silicon drift detector (SDD) and a CMOS charge sensitive preamplifier with very low integration capacitor. Amplifier forms a slowly rising output shape and operates in pulse-reset mode. The 125 MHz ADC digitizes the signals. Using calibration data from Fe55 and Am241 gamma sources we check triangular and trapezoid digital filters to obtain the best noise and energy resolution performance. We are also examining the option to differentiate the output signal.