Astronomy and Astrophysics – Astronomy
Scientific paper
Mar 2010
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=2010stt..conf..348z&link_type=article
Twenty-First International Symposium on Space Terahertz Technology, held March 23-25, 2010 at Oxford University's Said Business
Astronomy and Astrophysics
Astronomy
1
Scientific paper
In this paper, we revisit the optics design for the ALMA Band 1 cartridge as presented previously by M. Carter and report on progress made towards that end. Since the layout of the ALMA cartridges is not optimised for the lowest frequency band, certain design trade-offs must be made; most importantly the use of a re-focusing lens is required to avoid blocking other bands and the ALMA calibration device assembly. Furthermore, we are motivated to analyse the optics design because close to half of the receiver noise budget is consumed by the optics, mostly due to truncation, reflection, and dielectric loss of the lens and infrared filters. Any small improvement in the optics is worthwhile as its contribution is cascaded through the receiver. Also of significance, the antenna and cryostat layout has changed since the original reports and that related to Band 1 must be clarified and updated.
Bronfman Leonard
Claude Stéphane
Henke Doug
May Jorge
Mena P.
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