Abstract

Baikal-GVD is a cubic kilometer-scale neutrino telescope currently under construction in Lake Baikal. The detector’s components are mobile and may drift from their initial coordinates or change their spatial orientation. This introduces a reconstruction error, particularly a timing error for PMT hits. This problem is mitigated by a combination of a hydroacoustic positioning system and per-component acceleration and orientation sensors. Under regular conditions, the average positioning accuracy for a GVD component is estimated to be less than 13 cm.

Highlights

  • Baikal-GVD [1] is a gigaton volume neutrino telescope currently under construction in Lake Baikal

  • An optical modules (OMs) positioning error is equivalent to an error in time calibration, so correctly positioning OMs is crucial for event reconstruction and causality-based hit selection

  • To gauge the OM positioning error for the APS an additional beacon has been installed on the central string of cluster 3, between beacons 3 and 4

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Summary

Introduction

Baikal-GVD [1] is a gigaton volume neutrino telescope currently under construction in Lake Baikal. At the moment, it is the largest neutrino detector in the Northern Hemisphere. Because of the currents in Lake Baikal, the string geometry changes with time and individual OMs can drift tens of meters from their initial coordinates. An OM positioning error is equivalent to an error in time calibration, so correctly positioning OMs is crucial for event reconstruction and causality-based hit selection. To address this problems, a spatial positioning system has been developed [3, 4]

Hydroacoustic positioning
Positioning precision
Conclusion
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