# Neutrino 2018 - XXVIII International Conference on Neutrino Physics and Astrophysics

4-9 June 2018
Heidelberg
Europe/Berlin timezone
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# Contribution Poster 0vbb

Poster (participating in poster prize competition)

# SMELLIE: A Laser Calibration System for SNO+

## Speakers

• Ms. Esther TURNER

## Authorship annotation

On behalf of the SNO+ collaboration

## Session and Location

Monday Session, Poster Wall #83 (Auditorium Gallery Left)

## Abstract content

SNO+ is a general purpose neutrino detector 2km underground in SNOLAB. Its main aim is a neutrinoless double beta decay search in $^{130}$Te. It consists of a 6m radius acrylic vessel filled with the detection medium and surrounded by ~9300 PMTs on a support structure (PSUP) at a radius of ~8.9m.

Having a good understanding of detector response is vital for success. One contribution to this is SMELLIE (the Scattering Module for the Embedded LED/Laser Light Injection Entity). SMELLIE is an in-situ optical calibration system designed to measure and characterise scattering properties of the detector. It consists of 15 optical fibres attached to the PSUP, connected to 5 lasers above the detector, with a wavelength range from 375 – 700nm.

SMELLIE has been commissioned during the water phase of SNO+, in which the longer scattering and absorption lengths and lack of re-emission make it possible to extract the beam profiles and understand the response of the internal monitoring system.

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