Mr. Shinji Oka Profile

Shinji Oka

at Subaru Telescope NAOJ

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Proceedings Article | 25 July 2024 Paper

Dome safety interlock system at Subaru Telescope

Junichi Noumaru, Shinji Oka, Naomi Yoshiyama, Lucio Ramos, Koichi Okamoto, Lulu Blessing

Proceedings Volume 13098, 130981O (2024) https://doi.org/10.1117/12.3016481

KEYWORDS: Telescopes, Safety, Domes, Control systems, Switches, Sensors, Observatories, Magnetic sensors

Read Abstract +

After a fall accident that occurred in 2018, Subaru Telescope designed and implemented the dome safety interlock system. An access from the Control Building to the dome requires walk between the landing platform at the Elevator Tower and the dome landing platform. These platforms meet only at two discrete angles of the dome and the platforms are not passable when the dome points to other angles. After the accident, we made an extensive investigation and found that at the time of the accident, one of the double doors installed at the landing platform was unlocked and the dome was pointed away from the angle where the platforms are passable. In this paper, we will cover the unique structure of the dome access of Subaru Telescope, the accident investigation, the temporary measures, the engineering of the final solutions and the installation. We also discuss the lessons learned from this accident.

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