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The Subaru Seminar is
usually held in Room 104 of the Hilo Base Facility, adjacent
to the main lobby. Everyone is welcome to attend. If you are
interested in giving a seminar, please contact Subaru seminar organizers
(Tadayuki Kodama, Kumiko S. Usuda, Naoyuki Tamura, Tomonori Usuda)
by email : sseminar_at_subaru.naoj.org (please change"_at_" to @).
October 21, Friday, at 1:00 pm
" Cryocooling of Large Astronomical Instruments "
Hugh Thompson
(TMT Project)
Cooling of infrared instruments for TMT may require some new methods that have not been typically considered previously for astronomical instrumentation.
In particular as next generation AO systems come online, vibration concerns are becoming ever more critical.
In this talk I will outline the main options available for cryocooling of instruments describing the advantages and disadvantages of Gifford-McMahon,
Joule-Thomson, Stirling and Turbo-Brayton coolers, considering vibration, cost, complexity and reliability.
I will describe the work being done to select the best option for TMT and the technical challenges that come with those choices.