Europa clipper ultraviolet spectrograph:  ground calibration results

Michael W. Davis; Kurt D. Retherford; Philippa M. Molyneux; G. Randall Gladstone; Noel Eloriaga; Rohini S. Giles; Thomas K. Greathouse; Ujjwal Raut; Todd J. Veach; Sue Ferrell; Maarten H. Versteeg; Matthew A. Freeman; Kristian B. Persson

doi:10.1117/12.2630530

31 August 2022 Europa clipper ultraviolet spectrograph: ground calibration results

Michael W. Davis, Kurt D. Retherford, Philippa M. Molyneux, G. Randall Gladstone, Noel Eloriaga, Rohini S. Giles, Thomas K. Greathouse, Ujjwal Raut, Todd J. Veach, Sue Ferrell, Maarten H. Versteeg, Matthew A. Freeman, Kristian B. Persson

Author Affiliations +

Proceedings Volume 12181, Space Telescopes and Instrumentation 2022: Ultraviolet to Gamma Ray; 1218138 (2022) https://doi.org/10.1117/12.2630530
Event: SPIE Astronomical Telescopes + Instrumentation, 2022, Montréal, Québec, Canada

Conference Poster

Abstract

We describe the radiometric performance and ground calibration results of the Europa Clipper Ultraviolet Spectrograph (Europa-UVS). Europa-UVS is a modest power (~8 W) ultraviolet spectrograph that is the sixth in a series of Alice/UVS instruments built by SwRI. Europa-UVS covers a 55-206 nm bandpass with approximately 0.6 nm spectral resolution over a 7.5° field of view with better than 0.25° spatial resolution on-axis. Europa-UVS also features three different observing modes to allow higher-than-normal spatial resolution observing as well as solar occultations of Europa. Both the high spatial resolution and solar occultation observations have reduced sensitivity when compared with nominal observations. Europa-UVS meets all performance requirements with margin, and is the first planetary UV spectrograph to feature a microchannel plate detector with curved borosilicate microchannel plates (expected to be less sensitive to gamma rays than traditional plates). Europa-UVS, like its predecessor JUICE-UVS, incorporates both timetagged pixel list and histogram observing with programmable acquisitions to maximize science return while minimizing data storage and downlink. Europa-UVS will search near Europa for water vapor plumes, examine the composition and structure of Europa’s atmosphere and surface, and characterize Europa's aurora.

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Michael W. Davis, Kurt D. Retherford, Philippa M. Molyneux, G. Randall Gladstone, Noel Eloriaga, Rohini S. Giles, Thomas K. Greathouse, Ujjwal Raut, Todd J. Veach, Sue Ferrell, Maarten H. Versteeg, Matthew A. Freeman, and Kristian B. Persson "Europa clipper ultraviolet spectrograph: ground calibration results", Proc. SPIE 12181, Space Telescopes and Instrumentation 2022: Ultraviolet to Gamma Ray, 1218138 (31 August 2022); https://doi.org/10.1117/12.2630530

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