Measurement of performance of the NectarCAM photodetectors
A. Tsiahina, P. Jean, J.-F. Olive, J. Kn\"odlseder, C. Marty, T., Ravel, C. Jarnot, B. Biasuzzi, J. Bolmont, F. Brun, S. Caroff, E. Delagnes,, S. Fegan, G. Fontaine, D. Gascon, J.-F. Glicenstein, D. Hoffmann, S. Karkar,, J.-P. Lenain, J. Paredes, P.-O. Petrucci, J. Prast
TL;DR
This paper presents the development and testing of a dedicated bench to evaluate the performance of NectarCAM's focal plane modules, ensuring they meet the specifications for Cherenkov Telescope Array observations.
Contribution
It introduces a specialized test setup for validating and qualifying NectarCAM FPMs, providing detailed performance measurements before camera integration.
Findings
Photo-multiplier gains are stable.
Pulse widths and transit time spreads meet specifications.
Charge resolutions are within required limits.
Abstract
NectarCAM is a camera for the medium-sized telescopes of the Cherenkov Telescope Array (CTA), which covers the energy range of 100 GeV to 30 TeV. The camera is equipped with 265 focal plane modules (FPMs). Each FPM comprises 7 pixels, each consisting of a photo-multiplier tube, a preamplifier, an independently controlled power supply, and a common control system. We developed a dedicated test bench to validate and qualify the industrial FPM production and to measure the performance of each FPM in a dark room before its integration in the camera. We report the measured performance of 61 FPM prototypes obtained with our experimental setup. We demonstrate that the gains of the photo multiplier tubes are stable and that pulse widths, transit time spreads, afterpulse rates and charge resolutions are within the specifications for NectarCAM.
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