National Astronomical Observatory of Japan (NAOJ) is responsible for procuring the Telescope Structure System (STR) of the Thirty Meter Telescope (TMT) and engaged Mitsubishi Electric Corporation (MELCO) to perform the preliminary/final design and production readiness work since 2012. The final design of the TMT STR was deemed completed through a series of external design reviews covering structural and mechanical, controls, and auxiliary systems such as the Segment Handling System (SHS), Aerial Service Platform (ASP), Elevator (ELV), safety, and the seismic isolation system. TMT STR is currently in the production readiness phase and has already passed the Production Readiness Reviews (PRRs) for major rotating mechanical structures. In this paper we present an overview of the design progress of the TMT STR, matured through extensive studies, performance assessments, and design budgets derived from bottoms-up analyses. Additionally, we discuss prototype activities to mitigate risks to performance and manufacturability of complex designs, along with the current programmatic status of the project.
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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