Empirical characterization of JWST wavefront error variations

Randal C. Telfer; Marcio Meléndez; Nicolas Flagey; Charles-Philippe Lajoie; Gregory R. Brady; Tracy Beck; Thomas M. Comeau; Bernard A. Kulp; Marshall D. Perrin; Matthew D. Lallo

doi:10.1117/12.3020273

23 August 2024 Empirical characterization of JWST wavefront error variations

Randal C. Telfer, Marcio Meléndez, Nicolas Flagey, Charles-Philippe Lajoie, Gregory R. Brady, Tracy Beck, Thomas M. Comeau, Bernard A. Kulp, Marshall D. Perrin, Matthew D. Lallo

Author Affiliations +

Proceedings Volume 13092, Space Telescopes and Instrumentation 2024: Optical, Infrared, and Millimeter Wave; 1309210 (2024) https://doi.org/10.1117/12.3020273
Event: SPIE Astronomical Telescopes + Instrumentation, 2024, Yokohama, Japan

Abstract

Based on phase retrieval of defocused point source images from JWST commissioning, routine maintenance, and science data, we characterize components of the JWST OTE wavefront error variations over a wide range of time scales, including the accumulation of segment pose changes (tilt events) over days and weeks of typical wavefront control cycles, smooth drifts over hours and days, oscillation due to thermal cycling of the ISIM Electronics Compartment heaters with periods of a few minutes, and mechanical vibration modes with periods ~1 second and less. We extract the spatial and temporal forms of the detected WFE variations and explore correlation with relevant observatory telemetry data, including reaction wheel rotation speeds, IEC heater panel temperatures, and spacecraft attitude. This analysis extends the initial performance characterization during JWST commissioning and is intended to enhance the understanding and utility of JWST observations, as well as to provide more detailed in-flight characterization of optical stability for evaluation of integrated modeling and insight for the design and development of future observatories.

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Randal C. Telfer, Marcio Meléndez, Nicolas Flagey, Charles-Philippe Lajoie, Gregory R. Brady, Tracy Beck, Thomas M. Comeau, Bernard A. Kulp, Marshall D. Perrin, and Matthew D. Lallo "Empirical characterization of JWST wavefront error variations", Proc. SPIE 13092, Space Telescopes and Instrumentation 2024: Optical, Infrared, and Millimeter Wave, 1309210 (23 August 2024); https://doi.org/10.1117/12.3020273

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