Speaker
Description
The Neutron Veto of the XENONnT experiment is designed as a Gadolinium-doped water Cherenkov detector to readuce the Nuclear Recoil background due to the radiogenic neutrons generated from the detector materials, mainly Time Projection Chambers (TPC) photomultipliers (PMTs) and cryostat structure, that mimic WIMP-induced signatures.
The Neutron Veto sub-detector is made of an octagonal structure (3 m-high and 4 m-wide) inside the water tank around the cryostat. A total of 120 Hamamatsu 8” high-QE PMTs with low-radioactivity windows are installed along the lateral walls to detect the Cherenkov photons.
To properly identify dangerous neutrons producing a single scatter nuclear recoil in the TPC, the Neutron Veto readout system must have the ability to distinguish single photo-electrons (SPE), namely good time resolution and a data collection with fully independent channels without the use of a global trigger.
In this work, we will describe the implementation and the performance of the Neutron Veto electronics and data acquisition system during the first three science runs. We will also present the implementation of the control and monitoring system for the readout boards, realized in hardware, that manages both the busy/veto logic and calibration signals.
| Collaboration(s) | on behalf of the XENON Collaboration |
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