Characterization and Performance of an Upgraded Front-End-board for NectarCAM

Nuclear Instruments and Methods in Physics Research Section A Accelerators Spectrometers Detectors and Associated Equipment（2024）

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Abstract

This paper presents an analysis of the updated version of the Front-End Board(FEB) for the NectarCAM camera, developed for the Cherenkov Telescope ArrayObservatory (CTAO). The FEB is a critical component responsible for reading andconverting signals from the camera's photo-multiplier tubes into digital dataand generating module-level trigger signals. This study provides an overview ofthe design and performance of the new FEB version, including the use of animproved NECTAr3 chip with advanced features. The NECTAr3 chip contains aswitched capacitor array for sampling signals at 1 GHz and a 12-bitanalog-to-digital converter (ADC) for digitization upon receiving a triggersignal. The integration of the new NECTAr3 chip results in a significantreduction of NectarCAM's deadtime by an order of magnitude compared to theprevious version. The paper also presents the results of laboratory testing,including measurements of timing performance, linearity, dynamic range, anddeadtime, to characterize the new FEB's performance.

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Key words

NECTAr3 chip,Deadtime,Linearity,Timing resolution,Gamma ray,Cherenkov,NectarCAM,CTAO

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