Resolving the dark current anomaly in the Nancy Grace Roman Space Telescope focal plane

Gregory Mosby Jr.; Synthia Tonn; Jay Chervenak; Bob Hill; Majid Zandian; Bernie Rauscher; Jeff Kruk; Mat Samuel; John Auyeung; Randy Kimble; Matt Greenhouse; Josh Schlieder; Ed Cheng; Craig Cabelli; Eric Piquette; Jianmei Pan; Murzy Jhabvala; Alan Abeel; Mark Farris; Anders Petersen; John Gygax; Mario Cabrera; Michael Hickey; Colin Stuart; Analia Cillis; Stephanie Cheung; Nibir Dhar

doi:10.1117/12.3020366

23 August 2024 Resolving the dark current anomaly in the Nancy Grace Roman Space Telescope focal plane

Gregory Mosby Jr., Synthia Tonn, Jay Chervenak, Bob Hill, Majid Zandian, Bernie Rauscher, Jeff Kruk, Mat Samuel, John Auyeung, Randy Kimble, Matt Greenhouse, Josh Schlieder, Ed Cheng, Craig Cabelli, Eric Piquette, Jianmei Pan, Murzy Jhabvala, Alan Abeel, Mark Farris, Anders Petersen, John Gygax, Mario Cabrera, Michael Hickey, Colin Stuart, Analia Cillis, Stephanie Cheung, Nibir Dhar

Author Affiliations +

Proceedings Volume 13092, Space Telescopes and Instrumentation 2024: Optical, Infrared, and Millimeter Wave; 130923K (2024) https://doi.org/10.1117/12.3020366
Event: SPIE Astronomical Telescopes + Instrumentation, 2024, Yokohama, Japan

Conference Poster

Abstract

The Nancy Grace Roman Space Telescope project is NASA's next flagship astrophysics mission to study dark energy, dark matter, and exoplanets along with the innumerable topics that will be enabled by the infrared survey telescope's instruments. The Wide Field Instrument contains a focal plane of 18 newly developed Teledyne H4RG-10 HgCdTe detectors. Roman's focal plane completed its first system level thermal vacuum test at NASA Goddard in 2022, when an increase in dark current compared to component level testing was observed for several detectors. Roman chartered an anomaly review board (ARB) and in collaboration with Teledyne undertook a testing program to help identify possible root cause and select from Roman's spare inventory suitable replacement detectors for devices that had significantly degraded. A possible root cause was determined by the ARB along with recommendations for how to prevent further degradation. We summarize the initial observation of the detector anomaly, present the detector testing strategy to find suitable spares and provide evidence of root cause, share the general findings of the ARB, and show new data showing the improved dark current performance.

(2024) Published by SPIE. Downloading of the abstract is permitted for personal use only.

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Gregory Mosby Jr., Synthia Tonn, Jay Chervenak, Bob Hill, Majid Zandian, Bernie Rauscher, Jeff Kruk, Mat Samuel, John Auyeung, Randy Kimble, Matt Greenhouse, Josh Schlieder, Ed Cheng, Craig Cabelli, Eric Piquette, Jianmei Pan, Murzy Jhabvala, Alan Abeel, Mark Farris, Anders Petersen, John Gygax, Mario Cabrera, Michael Hickey, Colin Stuart, Analia Cillis, Stephanie Cheung, and Nibir Dhar "Resolving the dark current anomaly in the Nancy Grace Roman Space Telescope focal plane", Proc. SPIE 13092, Space Telescopes and Instrumentation 2024: Optical, Infrared, and Millimeter Wave, 130923K (23 August 2024); https://doi.org/10.1117/12.3020366

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