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Cryogenic emissivities/microwave feed horn design

  1. Jul 17, 2011 #1
    Hi! I'm an intern at UCSB working with a team to build a dewar (basically a complicated thermos to keep the amplifier cold) for a microwave telescope. I'm doing some complex radiative heat transfer calculations, but in order for them to be accurate I need emissivities for aluminum at cryogenic temperatures, specifically 20K, 77K, and 4-5 K. This information is surprisingly hard to find. The aluminum is a 60/61 alloy for the most part. If anyone knows any information that would be great!

    Also if anyone knows a good source for learning more about radiometer design (microwave telescope optics) please let me know. Thanks!

  2. jcsd
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