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arXiv · 1805.08636

The electronics of the energy plane of the NEXT-White detector

V. Álvarez·V. Herrero·R. Esteve·A. Laing·J. Rodríguez·M. Querol·F. Monrabal·J. F. Toledo·J. J. Gómez-Cadenas
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Abstract

This paper describes the electronics of NEXT-White (NEW) detector PMT plane, a high pressure xenon TPC with electroluminescent amplification (HPXe-EL) currently operating at the Laboratorio Subterraáneo de Canfranc (LSC) in Huesca, Spain. In NEXT-White the energy of the event is measured by a plane of photomultipliers (PMTs) located behind a transparent cathode. The PMTs are Hamamatsu R11410-10 chosen due to their low radioactivity. The electronics have been designed and implemented to fulfill strict requirements: an overall energy resolution below 1% and a radiopurity budget of 20 mBq unit-1 in the chain of 214Bi . All the components and materials have been carefully screened to assure a low radioactivity level and at the same time meet the required front-end electronics specifications. In order to reduce low frequency noise effects and enhance detector safety a grounded cathode connection has been used for the PMTs. This implies an AC-coupled readout and baseline variations in the PMT signals. A detailed description of the electronics and a novel approach based on a digital baseline restoration to obtain a linear response and handle AC coupling effects is presented. The final PMT channel design has been characterized with linearity better than 0.4% and noise below 0.4mV .

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V. Álvarez, V. Herrero, R. Esteve, A. Laing, J. Rodríguez, M. Querol, F. Monrabal, J. F. Toledo, J. J. Gómez-Cadenas. 2018-12-04. The electronics of the energy plane of the NEXT-White detector. https://doi.org/10.1016/j.nima.2018.11.126

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