12-23 July 2021
Online
Europe/Berlin timezone

Method and device for tests of the laser optical calibration system for the Baikal-GVD underwater neutrino Cherenkov telescope

13 Jul 2021, 12:00
1h 30m
05

05

Talk NU | Neutrinos & Muons Discussion

Speaker

Mr Konrad Kopański (The H. Niewodniczański Institute of Nuclear Physics Polish Academy of Sciences)

Description

The large-scale deep underwater Cherenkov neutrino telescopes like Baikal-GVD, ANTARES or KM3NeT, require calibration and testing methods of their optical modules. These methods usually include laser-based systems which allow to check the telescope responses to the light and for real-time monitoring of the optical parameters of water such as absorption and scattering lengths, which show seasonal changes in natural reservoirs of water. We will present a testing method of a laser calibration system and a set of dedicated tools developed for BaikalGVD, which includes a specially designed and built, compact, portable, and reconfigurable scanning station. This station is adapted to perform fast quality tests of the underwater laser sets just before their deployment in the telescope structure. The testing procedure includes the energy stability test of the laser device, 3D scan of the light emission from the diffuser and attenuation test of the optical elements of the laser calibration system. The test bench consists primarily of an automatic mechanical scanner with a movable Si detector, beam splitter with a reference Si detector and, optionally, Q-switched diode-pumped solid-state laser used for laboratory scans of the diffusers. The presented test bench enables a three-dimensional scan of the light emission from diffusers, which are designed to obtain the isotropic distribution of photons around the point of emission. The results of the measurement can be easily shown on a 3D plot immediately after the test and may be also implemented to a dedicated program simulating photons propagation in water, which allows to check the quality of the diffuser in the scale of the Baikal-GVD telescope geometry.

Keywords

Baikal-GVD, BGVD, neutrino telescopes, Cherenkov telescopes, testing method, 3D scan, laser, test bench, optical diffuser, instrumentation, photon propagation

other Collaboration Baikal-GVD
Subcategory Experimental Methods & Instrumentation

Primary author

Mr Konrad Kopański (The H. Niewodniczański Institute of Nuclear Physics Polish Academy of Sciences)

Co-authors

Wojciech Noga (The Henryk Niewodniczański Institute of Nuclear Physics Polish Academy of Sciences) Mr Mateusz Wiśniewski (Silesian University of Technology) Dariusz Gora (Institute of Nuclear Physics PAN Cracow) Dr Apoorva Bhatt (The Henryk Niewodniczański Institute of Nuclear Physics Polish Academy of Sciences) Dr Paweł Malecki (The Henryk Niewodniczański Institute of Nuclear Physics Polish Academy of Sciences) Dr Jaroslaw Stasielak (Institute of Nuclear Physics PAN)

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