Optical properties of the fluorescence detector in the Telescope Array experiment using the Opt-copter
The Opt-copter was developed as a calibration device for the FDs. The Opt-copter is equipped with a UV LED light source and a Real-Time Kinematic GPS (RTK-GPS) module for precise positioning. Using the Opt-copter, the pointing direction analysis of all 38 TA-FDs at the three stations has been completed using the Opt-copter. As a result, the elevation shifts showed different tendencies at each station. Similar shifts were observed among FDs pointing in similar directions, even if located at different stations about 35 km apart. This suggests that systematic effects may have been introduced by the types and motions of stars observed by FDs. The overall uncertainty of this analysis was estimated to be 0.03°.
Authors
- Daisuke Ikeda (ORCID: https://orcid.org/0000-0002-5666-7387)
- Atsushi Matsuzawa (ORCID: https://orcid.org/0000-0001-8303-3905)
- Y. Tameda (ORCID: https://orcid.org/0000-0001-9750-5440)
- Daiki Sato (ORCID: https://orcid.org/0000-0001-8528-2315)
- John Matthews
- Takayuki Tomida
Publication Details
- Published
- 2025-09-24
- DOI
- https://doi.org/10.22323/1.501.0330
- Primary Topic
- Astronomy and Astrophysical Research
- Type
- article
- Field-Weighted Citation Impact
- 0.00
Funders
- National Science Foundation
- University of Utah
- European Commission
- National Research Foundation
- Academia Sinica
- National Research Foundation of Korea
- University of Tokyo
- Forskningsrådet om Hälsa, Arbetsliv och Välfärd
- Ministry of Science and Higher Education of the Russian Federation
- U.S. Air Force
- U.S. Bureau of Land Management
- Japan Society for the Promotion of Science
- RIKEN
- Institute for Cosmic Ray Research, University of Tokyo