In-flight performance and calibration of the grating wheel assembly sensors (NIRSpec/JWST)

@inproceedings{AlvesdeOliveira2022InflightPA,
  title={In-flight performance and calibration of the grating wheel assembly sensors (NIRSpec/JWST)},
  author={Catarina Alves de Oliveira and Nora L{\"u}tzgendorf and Peter R. Zeidler and Giovanna Giardino and Pierre Ferruit and Nimisha Kumari and Timothy D. Rawle and Stephan M. Birkmann and Torsten Boeker and Charles R. Proffitt and Marco Sirianni and Maurice B. J. te Plate},
  booktitle={Astronomical Telescopes + Instrumentation},
  year={2022}
}
The Near-Infrared Spectrograph (NIRSpec) on board of the James Webb Space Telescope will be the first multiobject spectrograph in space offering ∼250,000 configurable micro-shutters, apart from being equipped with an integral field unit and fixed slits. At its heart, the NIRSpec grating wheel assembly is a cryogenic mechanism equipped with six dispersion gratings, a prism, and a mirror. The finite angular positioning repeatability of the wheel causes small but measurable displacements of the… 

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