Cartridge-Type 800 GHz Receiver for the Atacama Submillimeter Telescope Experiment (ASTE)

Details Cartridge-Type 800 GHz Receiver for the Atacama Submillimeter Telescope Experiment (ASTE) Cartridge-Type 800 GHz Receiver for the Atacama Submillimeter Telescope Experiment (ASTE)

Dec 2004

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=2004pasj...56.1115s&link_type=abstract

Publications of the Astronomical Society of Japan, Vol.56, No.6, pp. 1115-1126

Astronomy and Astrophysics

Astronomy

7

Instrumentation: Detectors, Submillimeter

Scientific paper

We have developed a cartridge-type 800GHz receiver for the ASTE telescope in Atacama, Chile. The receiver has been assembled with a cooled receiver optics, a Nb-based SIS mixer, a local oscillator (LO) optics, and IF components in a 170mm diameter column-type cartridge. The cooled optics is composed of a single ellipsoidal mirror to couple between the feed horn and the subreflector of the antenna, and an LO coupler with 10% efficiency. Owing to its cartridge and cryostat structure, the mechanical vibrations of the GM cryocooler are significantly reduced, and therefore the receiver is highly stable on the telescope. The receiver noise temperature, using a Nb-based SIS mixer and a 4-8GHz HEMT amplifier, was attained to 1300K in DSB at an LO frequency of 815GHz. The system noise temperature, Tsys, was typically 4000-8000K in DSB at an LO frequency of 812GHz during operations, which depended on the atmospheric opacity. The typical zenith opacity at an LO frequency of 812GHz was ˜ 1. The half-power beam width (HPBW) of the main beam was measured by total power scanning across the Moon, and was consistent with the diffraction limit. A spectrum of the CO J =7-6 line (806.6518GHz) toward Orion KL was successfully detected.

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