KEYWORDS: Interfaces, James Webb Space Telescope, Observatories, Space operations, Electronics, Space telescopes, Systems engineering, Simulation of CCA and DLA aggregates, Switches, Cooling systems
On the James Webb Space Telescope (JWST), the Mid-Infrared Instrument (MIRI) is unique among the four science
instruments in that it operates around 7K as opposed to 40K like the other three near infrared instruments. Remote
cooling of the MIRI is achieved through the use of a Joule-Thomson (J-T) Cooler, which is precooled by a multistage
Pulse Tube Cooler. The MIRI Cooler systems engineering is elaborate because the Cooler spans a multitude of regions
in the observatory that are thermally and mechanically unique with interfaces that encompass a number of different
organizations. This paper will discuss how a significant change to the MIRI Cooling System from a solid hydrogen
Dewar to a Cooler was achieved after the instrument Preliminary Design Review (PDR), and it will examine any system
compromises or impacts that resulted from this change so late in the instrument design. A general overview of the Dewar
and the Cooler systems management, the roles of the systems teams in the different organizations, how the requirements
are managed in such an elaborate environment, and the distinct design and Integration and Test (I&T) challenges will
also be provided.
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