Dr. Mostafa Lutfi Profile

Dr. Mostafa Lutfi

at Vera C. Rubin Observatory

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Proceedings Article | 29 August 2022 Presentation + Paper

Rubin Observatory hexapods: issues and upgrades

Douglas R. Neill, Brian Johnson, Myung Cho, Felipe Daruich, Holger Drass, Mostafa Lutfi, Kevin Sirano, Roberto Tighe, Te-Wei Tsai, Oliver Wiecha

Proceedings Volume 12188, 1218817 (2022) https://doi.org/10.1117/12.2628999

KEYWORDS: Actuators, Telescopes

Read Abstract +

The Vera Rubin Observatory hosts a large (8.4 meter) wide-field (3.5 degree) survey telescope⁴. The Secondary Mirror (M2) Assembly⁶ and Camera⁵ utilize large hexapods3 to facilitate optical positioning relative to the Primary/Tertiary Mirror. These hexapods were designed, fabricated, assembled, tested and met all their requirements¹. Unfortunately, both hexapods were damaged prior to integration. The camera hexapod was damaged from overheating induced separation of the low temperature grease into constituents. The M2 hexapod was damaged from water intrusion during shipping. In both cases the critical linear encoders/tapes interior to the hexapod actuators were affected. These encoders are used by the control system to determine the length of the actuator during hexapod operations. If these encoders require servicing while deployed on the telescope, the hexapod needs to be unloaded by removing its optical payload (camera or M2), and the hexapod disassembled. The hexapod actuator then needs to be disassembled and repaired. This procedure produces an unacceptable risk to equipment, and an excessive disruption of observing. To rectify this, the actuators were redesigned to allow on-telescope servicing of these encoders. The encoder to tape orientation was inverted, and an access cover was added. This facilitates servicing the encoder/tape while on the telescope, reducing the servicing time from days to minutes. To improve reliability, alterations were also applied to the electrical system. The limit switch wiring was rearranged, and the cabling to the hexapod legs was upgraded. Also, multiple software upgrades were incorporated to improve function, performance, and compatibility with the other observatory systems.

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