Operability assessment concept for the JWST/NIRSpec micro-shutter array (MSA)

Timothy D. Rawle; Giovanna Giardino; Catarina Alves de Oliveira; Stephan M. Birkmann; Torsten Böker; Pierre Ferruit; Nora Lützgendorf; Patrick Ogle; Elena Puga; Marco Sirianni; Maurice Te Plate

doi:10.1117/12.2311340

6 July 2018 Operability assessment concept for the JWST/NIRSpec micro-shutter array (MSA)

Timothy D. Rawle, Giovanna Giardino, Catarina Alves de Oliveira, Stephan M. Birkmann, Torsten Böker, Pierre Ferruit, Nora Lützgendorf, Patrick Ogle, Elena Puga, Marco Sirianni, Maurice Te Plate

Author Affiliations +

Proceedings Volume 10698, Space Telescopes and Instrumentation 2018: Optical, Infrared, and Millimeter Wave; 106983Q (2018) https://doi.org/10.1117/12.2311340
Event: SPIE Astronomical Telescopes + Instrumentation, 2018, Austin, Texas, United States

Abstract

JWST/NIRSpec will include the first space-borne multi-object spectrograph, comprising a micro-shutter array (MSA) of a quarter of a million closable apertures that can be individually addressed to select up to a couple of hundred objects within a ~3.2x3.4 arcmin field of view. Although more than ~85% of the unvignetted shutters are fully operational, the high degree of mechanical movement combined with complex circuitry on a small scale, inevitably leads to some non-operable shutters. In this paper we present an overview of the operability assessment concept for the MSA, employed during both ground tests and in flight. We describe the procedures used to detect, mitigate against, and even repair the non-operable shutters, and show the effect upon the multiplexing capability and output data from NIRSpec. We also present the operability trending results from ground tests, and discuss the probable impact on nominal operations after launch.

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Timothy D. Rawle, Giovanna Giardino, Catarina Alves de Oliveira, Stephan M. Birkmann, Torsten Böker, Pierre Ferruit, Nora Lützgendorf, Patrick Ogle, Elena Puga, Marco Sirianni, and Maurice Te Plate "Operability assessment concept for the JWST/NIRSpec micro-shutter array (MSA)", Proc. SPIE 10698, Space Telescopes and Instrumentation 2018: Optical, Infrared, and Millimeter Wave, 106983Q (6 July 2018); https://doi.org/10.1117/12.2311340

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