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Photomultiplier Characterisation and its Impact on Background for SABRE South

by W. J. D. Melbourne, O. Stanley, P. Urquijo and M. J. Zurowski

Submission summary

As Contributors: William Melbourne
Preprint link: scipost_202210_00042v1
Date submitted: 2022-10-05 01:12
Submitted by: Melbourne, William
Submitted to: SciPost Physics Proceedings
Proceedings issue: 14th International Conference on Identification of Dark Matter
Academic field: Physics
  • High-Energy Physics - Experiment
Approach: Experimental


SABRE (Sodium iodide with Active Background REjection) South is a NaI(Tl) based dark matter direct detection experiment located at the Stawell Underground Physics Laboratory (SUPL) [1,2]. It is designed to detect an annual modulation of WIMP recoils as an independent replication of the long-standing DAMA/LIBRA modulation signal. SABRE South will have a low energy threshold of 1 keV in the NaI(Tl) crystal detector and a low experimental background. This requires precise characterisation of the photomultipliers used to understand both their sensitivity at low thresholds and their contribution to the background. We report on the photomultiplier characterisation test bench developed for the crystal detector photomultipliers including studies of the single photon response, transit time, and dark noise. A specific focus is on estimating the contribution to the experimental background of coincident photomultiplier noise due to its predominance at low energy and inability to be modelled using traditional MC simulation.

Current status:
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Submission & Refereeing History

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Submission scipost_202210_00042v1 on 5 October 2022

Reports on this Submission

Anonymous Report 1 on 2022-11-7 (Invited Report)


Some typos and missed punctuation. Can be fixed during post production.


The manuscript describes developed system to characterise 36 photomultipliers for SABRE South experiment. The noise contribution to the background was evaluated. As well authors shortly present developed DOOM (cool name) tool which will be used for development of particle ID, estimation of signal efficiency etc. I am wondering if authors are planning to look below 1keV in future.
The text is clearly written. I recommend the manuscript for publication as it is.

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