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15 July 2010 Optics for MUSIC: a new (sub)millimeter camera for the Caltech Submillimeter Observatory
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Abstract
We will present the design and implementation, along with calculations and some measurements of the performance, of the room-temperature and cryogenic optics for MUSIC, a new (sub)millimeter camera we are developing for the Caltech Submm Observatory (CSO). The design consists of two focusing elements in addition to the CSO primary and secondary mirrors: a warm off-axis elliptical mirror and a cryogenic (4K) lens. These optics will provide a 14 arcmin field of view that is diffraction limited in all four of the MUSIC observing bands (2.00, 1.33, 1.02, and 0.86 mm). A cold (4K) Lyot stop will be used to define the primary mirror illumination, which will be maximized while keeping spillover at the sub 1% level. The MUSIC focal plane will be populated with broadband phased antenna arrays that efficiently couple to factor of (see manuscript) 3 in bandwidth,1, 2 and each pixel on the focal plane will be read out via a set of four lumped element filters that define the MUSIC observing bands (i.e., each pixel on the focal plane simultaneously observes in all four bands). Finally, a series of dielectric and metal-mesh low pass filters have been implemented to reduce the optical power load on the MUSIC cryogenic stages to a quasi-negligible level while maintaining good transmission in-band.
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Jack Sayers, Nicole G. Czakon, Peter K. Day, Thomas P. Downes, Ran P. Duan, Jiansong Gao, Jason Glenn, Sunil R. Golwala, Matt I. Hollister, Henry G. LeDuc, Benjamin A. Mazin, Philip R. Maloney, Omid Noroozian, Hien T. Nguyen, James A. Schlaerth, Seth Siegel, John E. Vaillancourt, Anastasios Vayonakis, Philip R. Wilson, and Jonas Zmuidzinas "Optics for MUSIC: a new (sub)millimeter camera for the Caltech Submillimeter Observatory", Proc. SPIE 7741, Millimeter, Submillimeter, and Far-Infrared Detectors and Instrumentation for Astronomy V, 77410W (15 July 2010); https://doi.org/10.1117/12.857324
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