The Mid-Infrared Instrument for the<i>James Webb Space Telescope</i>, III: MIRIM, The MIRI Imager

Abstract

In this article, we describe the MIRI Imager module (MIRIM), which provides\nbroad-band imaging in the 5 - 27 microns wavelength range for the James Webb\nSpace Telescope. The imager has a 0"11 pixel scale and a total unobstructed\nview of 74"x113". The remainder of its nominal 113"x113" field is occupied by\nthe coronagraphs and the low resolution spectrometer. We present the instrument\noptical and mechanical design. We show that the test data, as measured during\nthe test campaigns undertaken at CEA-Saclay, at the Rutherford Appleton\nLaboratory, and at the NASA Goddard Space Flight Center, indicate that the\ninstrument complies with its design requirements and goals. We also discuss the\noperational requirements (multiple dithers and exposures) needed for optimal\nscientific utilization of the MIRIM.\n