9 August 2016 The nuMOIRCS project: detector upgrade overview and early commissioning results
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Abstract
In 2014 and 2015 the Multi-Object InfraRed Camera and Spectrograph (MOIRCS) instrument at the Subaru Telescope on Maunakea is underwent a significant modernization and upgrade project. We upgraded the two Hawaii2 detectors to Hawaii2-RG models, modernized the cryogenic temperature control system, and rewrote much of the instrument control software. The detector upgrade replaced the Hawaii2 detectors which use the Tohoku University Focal Plane Array Controller (TUFPAC) electronics with Hawaii2-RG detectors using SIDECAR ASIC (a fully integrated FPA controller system-on-a-chip) and a SAM interface card. We achieved an improvement in read noise by a factor of about 2 with this detector and electronics upgrade. The cryogenic temperature control upgrade focused on modernizing the components and making the procedures for warm up and cool down of the instrument safer. We have moved PID control loops out of the instrument control software and into Lakeshore model 336 cryogenic temperature controllers and have added interlocks on the warming systems to prevent overheating of the instrument. Much of the instrument control software has also been re-written. This was necessitated by the different interface to the detector electronics (ASIC and SAM vs. TUFPAC) and by the desire to modernize the interface to the telescope control software which has been updated to Subaru's "Gen2" system since the time of MOIRCS construction and first light. The new software is also designed to increase reliability of operation of the instrument, decrease overheads, and be easier for night time operators and support astronomers to use.
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Josh Walawender, Josh Walawender, Matthew Wung, Matthew Wung, Maximilian Fabricius, Maximilian Fabricius, Ichi Tanaka, Ichi Tanaka, Nobuo Arimoto, Nobuo Arimoto, David Cook, David Cook, Brian Elms, Brian Elms, Yasuhito Hashiba, Yasuhito Hashiba, Yen-Sang Hu, Yen-Sang Hu, Ikuru Iwata, Ikuru Iwata, Tetsuo Nishimura, Tetsuo Nishimura, Koji Omata, Koji Omata, Naruhisa Takato, Naruhisa Takato, Shiang-Yu Wang, Shiang-Yu Wang, Mark Weber, Mark Weber, "The nuMOIRCS project: detector upgrade overview and early commissioning results", Proc. SPIE 9908, Ground-based and Airborne Instrumentation for Astronomy VI, 99082G (9 August 2016); doi: 10.1117/12.2231812; https://doi.org/10.1117/12.2231812
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