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Measurement of performance of the NectarCAM photodetectors
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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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Cited by 2 Pith papers
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Competition between Increasing and Decreasing Effects of the Afterpulsing Rate of PMTs during Night-Sky Observations
After five years of operation in the CTAO LST-1 camera, removed PMTs showed no increase in afterpulsing, while stored spare tubes worsened, indicating operation offsets helium-driven aging.
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Development and Quality Control of PMT Modules for the Large-Sized Telescopes of the Cherenkov Telescope Array Observatory
All four CTAO Large-Sized Telescope cameras are now equipped with qualified seven-PMT modules that meet the observatory performance requirements, with a rejection rate below one percent during quality control.
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