PoS - Proceedings of Science
Volume 395 - 37th International Cosmic Ray Conference (ICRC2021) - CRI - Cosmic Ray Indirect
Application of the nitrogen laser calibration system in LAASO-WFCTA
L. Chen*, X. Li, L. Ge, H. Liu, Q. Sun, Y. Wang, J. Xia, F. Zhu and Y. Zhang
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Pre-published on: July 05, 2021
Published on:
Abstract
The nitrogen laser calibration system for the Wide Field of View Cherenkov Telescope Array
(WFCTA) is one of the most important components of the Large High Altitude Air Shower
Observatory (LHAASO). This calibration system is composed of three parts, including a highprecision
3D lifting and rotating platform (HiRoP), a nitrogen laser and the wide field of view
Cherenkov telescope prototypes. The accuracy of the HiRoP is of great importance for the precise
calibration of WFCTA since it controls the laser beam’s pointing direction. A home-made HiRoP
was introduced and the measurements implies that the angular and lifting accuracies of HiRoP
are better than 0.003° and 0.075 mm, respectively. Furthermore, the pulse energy stability of
the nitrogen laser beam is another remarkably important factor. The nitrogen laser system with
a wavelength of 337.1 nm located in a high-precision temperature and humidity’s controlling
container, resulting in a pulse energy fluctuation less than 3 percent. Besides, the method of
a standard zero point verification is employed to improve the long-term accuracy of the beam
pointing direction.
DOI: https://doi.org/10.22323/1.395.0269
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