A Submillimeter Cartridge-Type Receiver: ALMA Band 8 (385--500 GHz) Qualification Model

Details A Submillimeter Cartridge-Type Receiver: ALMA Band 8 (385--500 GHz) Qualification Model A Submillimeter Cartridge-Type Receiver: ALMA Band 8 (385--500 GHz) Qualification Model

Oct 2008

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=2008pasj...60.1199s&link_type=abstract

Publications of the Astronomical Society of Japan, Vol.60, No.5, pp.1199--1207

Astronomy and Astrophysics

Astronomy

6

Instrumentation: Detectors, Submillimeter

Scientific paper

We have developed a cartridge-type receiver covering the frequency band of 385--500 GHz as a qualification model of Atacama Large Millimeter/submillimeter Array (ALMA) band 8. It receives two orthogonal polarizations and down-converts the sideband-separated signals to intermediate frequencies (IF) of between 4 and 8 GHz. The cartridge-type receiver consists of cold optics, two feed horns, a wire grid, mirrors, two sideband-separating SIS mixers, cryogenic multipliers of a local oscillator (LO), cryogenic and warm IF amplifiers, a cartridge body, and sensors/wirings. These components were individually tested, and then the cartridge was integrated and tested as a complete assembly. We have also developed equipment for efficiency tests of both the components and the integrated receiver. The single sideband (SSB) noise temperature of this receiver is 100 K at the band center and 300 K at the band edges. The beam pattern and cross-polarization pattern are consistent with a physical optical calculation. The amplitude stability is around 3 × 10-4 in 1 s. The phase stability is less than 2.0D on a time scale of 0.1 s to 10 min. These results are promising for a receiver in the ALMA.

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