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Proceedings Paper • Open Access

JWST-MIRI spectrometer main optics design and main results
Author(s): Ramón Navarro; Ton Schoenmaker; Gabby Kroes; Ad Oudenhuysen; Rieks Jager; Lars Venema

Paper Abstract

MIRI ('Mid InfraRed Instrument') is the combined imager and integral field spectrometer for the 5-29 micron wavelength range under development for the James Webb Space Telescope JWST. The flight acceptance tests of the Spectrometer Main Optics flight models (SMO), part of the MIRI spectrometer, are completed in the summer of 2008 and the system is delivered to the MIRI-JWST consortium.

The two SMO arms contain 14 mirrors and form the MIRI optical system together with 12 selectable gratings on grating wheels. The entire system operates at a temperature of 7 Kelvin and is designed on the basis of a 'no adjustments' philosophy. This means that the optical alignment precision depends strongly on the design, tolerance analysis and detailed knowledge of the manufacturing process. Because in principle no corrections are needed after assembly, continuous tracking of the alignment performance during the design and manufacturing phases is important.

The flight hardware is inspected with respect to performance parameters like alignment and image quality. The stability of these parameters is investigated after exposure to various vibration levels and successive cryogenic cool downs. This paper describes the philosophy behind the acceptance tests, the chosen test strategy and reports the results of these tests. In addition the paper covers the design of the optical test setup, focusing on the simulation of the optical interfaces of the SMO. Also the relation to the SMO qualification and verification program is addressed.

Paper Details

Date Published: 21 November 2017
PDF: 10 pages
Proc. SPIE 10566, International Conference on Space Optics — ICSO 2008, 105662C (21 November 2017); doi: 10.1117/12.2308224
Show Author Affiliations
Ramón Navarro, NOVA-ASTRON (Netherlands)
Ton Schoenmaker, NOVA-ASTRON (Netherlands)
Gabby Kroes, NOVA-ASTRON (Netherlands)
Ad Oudenhuysen, NOVA-ASTRON (Netherlands)
Rieks Jager, NOVA-ASTRON (Netherlands)
Lars Venema, NOVA-ASTRON (Netherlands)

Published in SPIE Proceedings Vol. 10566:
International Conference on Space Optics — ICSO 2008
Josiane Costeraste; Errico Armandillo; Nikos Karafolas, Editor(s)

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