A High Precision Pulse Generation and Stabilization System for Bolometric Experiments

TL;DR

This paper introduces a highly precise, stable pulse generation system for bolometric experiments, enhancing calibration accuracy and thermal stability in low-background, rare event searches.

Contribution

The paper presents a novel, fully programmable pulse generator with multi-outputs and remote control, specifically designed for bolometric calibration in rare event experiments.

Findings

Achieved 20 eV FWHM energy resolution at 1 MeV

Thermal stability of 0.1 ppm/°C

Remote control via CAN bus implemented

Abstract

Bolometric experiments searching for rare events usually require an extremely low radioactive background to prevent spurious signals from mimicking those of interest, spoiling the sensitivity of the apparatus. In such contexts, radioactive sources cannot be used to produce a known signal to calibrate the measured energy spectrum during data taking. In this paper we present an instrument designed to generate ultra-stable and very precise calibrating pulse, which can be used to stabilize the response of bolometers during data taking. The instrument is characterized by the presence of multi-outputs, a completely programmable pulse width and amplitude and a dedicated daisy-chained optical trigger line. It can be fully controlled and monitored remotely via CAN bus protocol. An energy resolution of the order of 20 eV FWHM at 1 MeV (2 eV FWHM at 10 keV) and a thermal stability of the order of 0.1 ppm/{\deg}C have been achieved. The device can also provide an adjustable power to compensate the low frequency thermal fluctuations that typically occur in cryogenic experiments.