g Stockholm Observatory, SCFAB Astronomy, Stockholm (Sweden) h Rutherford Appleton Laboratory, Chilton, Didcot, OX11 0QX (UK) i Dublin Institute for Advanced Studies, 5 Merrion Square, Dublin2 (Ireland)
ABSTRACTThe MIRI is the mid-IR (5-28µm) instrument for NGST and provides for imaging, cororographic, high-and lowresolution spectroscopic capabilities. Unlike to the other instruments on NGST, the MIRI must be cooled -to reduce the thermal background from the optics and because the detectors require an operating temperature of about 7k.. In this paper we summarise the science goals, the proposed overall opto-mechanical concept, the thermal design aspects, the detectors and the expected sensitivity of the instrument.
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