We describe the post-delivery performance testing of the JUpiter ICy moons Explorer Ultraviolet Spectrograph (JUICE-UVS). JUICE-UVS is a modest power (8 W) ultraviolet imaging spectrograph that is the fifth in a series of Alice/UVS instruments built by Southwest Research Institute (SwRI). JUICE-UVS covers a 50-204 nm bandpass with 0.4 nm spectral resolution over a 7.5° field of view with better than 0.3° spatial resolution. JUICE-UVS will explore the Galilean satellites, examine the dynamics of Jupiter’s upper atmosphere from pole to equator, and investigate the Jupiter-Io connection through observations of the Io torus. JUICE-UVS underwent an extensive ground testing campaign at strategic points during the JUICE integration-and-testing over the course of four years and four countries on three continents. High voltage operations were enabled via the usage of specially designed Optical Ground Support Equipment (OGSE) that attached to the spacecraft for key tests. All performance requirements continue to be met, and there is no observable performance degradation after all spacecraft environmental testing and transport activities. In particular, the microchannel plate detector has similar sensitivity and dark rates as measured during pre-delivery testing. Testing of optical witness samples removed during key tests indicates the instrument optical throughput is unchanged. In-flight calibrations planned for shortly after launch will further confirm the performance of JUICE-UVS.
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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