LSST Camera focal plane optimization

Yousuke Utsumi; Pierre Antilogus; Pierre Astier; John Banovetz; Andrew K. Bradshaw; Johan Bregeon; Alex Broughton; Jim Chiang; Celine Combet; Guillaume Dargaud; Seth W. Digel; Johnny Esteves; Thibault Guillemin; Tony Johnson; Claire Juramy; Craig Lage; Shuang Liang; Stuart Marshall; Myriam Migliore; Homer Neal; Renee Nichols; Daniel Polin; Andrew P. Rasmussen; Steve Ritz; Eli Rykoff; Aaron Roodman; Theo Schutt; Adrian Sheshtakov; Adam Snyder; Gregg Thayer; Max Turri; Tony Tyson; Duncan Wood

doi:10.1117/12.3019117

27 August 2024 LSST Camera focal plane optimization

Yousuke Utsumi, Pierre Antilogus, Pierre Astier, John Banovetz, Andrew K. Bradshaw, Johan Bregeon, Alex Broughton, Jim Chiang, Celine Combet, Guillaume Dargaud, Seth W. Digel, Johnny Esteves, Thibault Guillemin, Tony Johnson, Claire Juramy, Craig Lage, Shuang Liang, Stuart Marshall, Myriam Migliore, Homer Neal, Renee Nichols, Daniel Polin, Andrew P. Rasmussen, Steve Ritz, Eli Rykoff, Aaron Roodman, Theo Schutt, Adrian Sheshtakov, Adam Snyder, Gregg Thayer, Max Turri, Tony Tyson, Duncan Wood

Author Affiliations +

Proceedings Volume 13103, X-Ray, Optical, and Infrared Detectors for Astronomy XI; 131030W (2024) https://doi.org/10.1117/12.3019117
Event: SPIE Astronomical Telescopes + Instrumentation, 2024, Yokohama, Japan

Abstract

The LSST Camera for the Vera C. Rubin Observatory has been constructed at SLAC National Accelerator Laboratory. The Camera covers a 3.5-degree field of view with 3.2 gigapixels. The goal of the LSST survey is to provide a well-understood astronomical source catalog to the community. The LSST Camera’s focal plane is populated by 189 sensors on the science focal plane that are a combination of E2V CCD250 and ITL STA3800 deep-depletion, back-illuminated devices, accompanying eight guide sensors, and four wavefront sensors. Nine science sensors are grouped as a ”Raft” with three identical electronics boards (REBs), each operating three sensors. The REB can change the operating voltages and CCD clock, allowing operation of sensors from two different vendors in the same focal plane. We conducted phased electro-optical testing campaigns to characterize and optimize the sensor performance in the construction phase. We collected images with the focal plane illuminated by flat illuminators and some specialty projectors to produce structured images. During these tests, we found some performance issues in noise, bias stability, gain stability, image persistence, and distortion in flat images, including ”tearing”. To mitigate those non-idealities, we attempted different clocking and operation voltages and switching from unipolar voltages to bipolar voltages in parallel clock rails for E2V devices. We describe the details and the results of the optimizations.

Conference Presentation

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Yousuke Utsumi, Pierre Antilogus, Pierre Astier, John Banovetz, Andrew K. Bradshaw, Johan Bregeon, Alex Broughton, Jim Chiang, Celine Combet, Guillaume Dargaud, Seth W. Digel, Johnny Esteves, Thibault Guillemin, Tony Johnson, Claire Juramy, Craig Lage, Shuang Liang, Stuart Marshall, Myriam Migliore, Homer Neal, Renee Nichols, Daniel Polin, Andrew P. Rasmussen, Steve Ritz, Eli Rykoff, Aaron Roodman, Theo Schutt, Adrian Sheshtakov, Adam Snyder, Gregg Thayer, Max Turri, Tony Tyson, and Duncan Wood "LSST Camera focal plane optimization", Proc. SPIE 13103, X-Ray, Optical, and Infrared Detectors for Astronomy XI, 131030W (27 August 2024); https://doi.org/10.1117/12.3019117

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