Heterodyne instrumentation upgrade at the Caltech submmillimeter observatory

被引：6

作者：

Kooi, JW ^{[1
]}

Kovács, A ^{[1
]}

Kaye, S ^{[1
]}

Dama, J ^{[1
]}

Edgar, ML ^{[1
]}

Zmuidzinas, J ^{[1
]}

Phillips, TG ^{[1
]}

机构：

[1] CALTECH, Pasadena, CA 91125 USA

来源：

MILLIMETER AND SUBMILLIMETER DETECTORS FOR ASTRONOMY | 2003年 / 4855卷

关键词：

radial probe; full-height waveguide to thin-film microstrip transition; split-block; superconducting-insulating-superconducting; (SIS) tunnel junction; broad bandwidth quadrature waveguide hybrid; DC-break; IF match;

D O I：

10.1117/12.459114

中图分类号：

P1 [天文学];

学科分类号：

0704 ;

摘要：

Under development at the Caltech Submillimeter Observatory is a dual polarization, continuous comparison (correlation) receiver. The instrument has two beams on the sky; a reference and a signal beam. Using only cooled reflecting optics, two polarizing grids, and a quadrature hybrid coupler, the sky beams are coupled to four tunerless SIS mixers (both polarizations). The 4-8 GHz mixer IF outputs are, after amplification, correlated against each other. In principle, this technique results in flat baselines with very low RMS noise and is especially well suited for high redshift Galaxy work. At the same time an upgrade is planned to the existing facility heterodyne instrumentation. Dual frequency mode receivers are under development for the 230/460 GHz and 345/660 GHz atmospheric windows. The higher frequency receivers are implemented in a balanced configuration, which reduces both the LO power requirement and noise. Each mixer has 4 GHz of IF bandwidth and can be controled remotely.

引用

页码：265 / 278

页数：14

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