[Vision2020] James Webb Space Telescope: "MIRI's detectors are a different formulation (Arsenic-doped Silicon (Si:As)), which need to be at a temperature of less than 7 kelvin to operate properly. "

[Ted Moffett]

All quotes below from websites.

Vision2020 Post: Ted Moffett

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NASA Readies James Webb Space Telescope for December Launch | NASA
<https://www.nasa.gov/press-release/nasa-readies-james-webb-space-telescope-for-december-launch>

NASA plans to launch the James Webb Space Telescope into orbit Dec. 18,
2021, to serve as the premier deep space observatory for the next decade.

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Webb, an international program led by NASA with its partners ESA (European
Space Agency) and the Canadian Space Agency, will launch on an Ariane 5
from Europe's Spaceport in French Guiana on the northeastern coast of South
America. ESA is providing the Ariane 5.

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Cryocooler Webb/NASA
<https://www.jwst.nasa.gov/content/about/innovations/cryocooler.html>

However, Webb's fourth scientific instrument, the Mid-infrared Instrument,
or MIRI, "sees" mid-infrared (MIR) light at wavelengths from 5 to 28
microns. By necessity MIRI's detectors are a different formulation
(Arsenic-doped Silicon (Si:As)), which need to be at a temperature of less
than 7 kelvin to operate properly. This temperature is not possible on Webb
by passive means alone, so Webb carries a "cryocooler" that is dedicated to
cooling MIRI's detectors.
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