First results on the performance of the PADME electromagnetic calorimeter

Gabriele Piperno

doi:10.1088/1748-0221/15/05/c05008

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arXiv · 2002.11671

First results on the performance of the PADME electromagnetic calorimeter

Gabriele Piperno

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Abstract

The PADME experiment, hosted at the Laboratori Nazionali di Frascati in Italy, is dedicated to the dark photon search. It looks for the reaction $e^{+}\,e^{-}\rightarrow A'\,\gamma$, where $A'$ indicates the dark photon. The $550\,\text{MeV}$ positrons beam that impinges on electrons, coming from an active diamond target, allows to scan $A'$ masses up to $23.7\,\text{MeV}$. In this context, the segmented electromagnetic calorimeter plays a fundamental role, since it measures the final photon four-momentum. It consists of $616$ BGO crystals displaced in a cylindrical shape of $\approx29\,\text{cm}$ radius with a central square hole of $5$ crystals side, to let Bremsstrahlung radiation pass, to limit the calorimeter trigger rate. Each crystal is read by a HZC XP1911 type B photomultipliers and their signal is digitised by means of a CAEN V1742 board, taking $1024$ samples at $1\,\text{GS/s}$. Here we report in detail the solutions adopted for the calorimeter together with the results obtained in tests performed on a small prototype and on single scintillating units.

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Gabriele Piperno. 2020-02-26. First results on the performance of the PADME electromagnetic calorimeter. https://doi.org/10.1088/1748-0221/15/05/c05008

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