Physics – Optics
Scientific paper
Dec 1998
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1998aas...193.1119h&link_type=abstract
American Astronomical Society, 193rd AAS Meeting, #11.19; Bulletin of the American Astronomical Society, Vol. 30, p.1267
Physics
Optics
Scientific paper
We are constructing a 7-element, SIS heterodyne array receiver (Desert STAR) for the Heinrich Hertz Telescope (HHT) atop Mt. Graham (AZ). The array will operate in the 870 mu m atmospheric window, with a tuning range between 315 and 380 GHz. Due to the prevailing physical conditions in the interstellar medium, this wavelength range is one of the richest in the submillimeter portion of the spectrum. The 870 mu m window also has the highest atmospheric transmission of any submillimeter band. An array designed for this wavelength range will make excellent use of the telescope, the available atmospheric transmission, and provide a new perspective on stellar, chemical, and galaxy evolution in the present, as well as past epochs. The cryostat utilizes a closed-cycle refrigerator to cool the mixers, IF amplifers and optics to 4 K. Ultimately, a cooled Martin-Puplett Interferometer (MPI) single sideband (SSB) filter will be incorporated into the system. Initially, the array will operate in double sideband (DSB) mode and use a mylar beamsplitter for local oscillator (LO) injection. Calculations indicate that LO injection via a beamsplitter should provide ample power to drive the 7-element array. The cryostat can support a second MPI for more efficient LO injection should that be necessary. First light observations with the array are planned for the fall of 1999.
Groppi Christopher E.
Hungerford Aimee
Walker Christopher K.
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