ISSTT Proceedings

ISSTT Proceedings

You searched for:search icon

No Keywords
Showing 0 of items from your search. Start over 

An 800 GHzSIS Mixer Using Nb-Al2O3-Nb SIS Junctions

Authors:
C. E. Honingh, K. Jacobs, D. Hottgenroth, S. Haas
Abstract:
The development of an 800 GHz mixer is part of a project to build a dual channel SIS receiver for submillimeter frequencies to be used at a ground based telescope. The two channels are integrated in one hybrid liquid helium dewar, and are each fed by one polarization of the incoming signal. Since most mixers are sensitive to one polarization only a factor of two in observing time is gained. Also the simultaneous observation at two frequencies improves the calibration accuracy of the two sets of data with respect to each other. This is especially important in observing spectral lines in molecular clouds of which the relative intensity at two frequencies is crucial to determination of their properties.The receiver will have one channel just for 450GHz-500 GHz, while the other channel can be used alternatively for 650-700 GHz or 800-820 GHz. For the two lower frequencies superconductor-insulator-superconductor (STS) quasi-particle mixers are the obvious choice. In the past few years there has been a rapid development of SIS mixers towards use at higher frequencies, and various groups have shown sensitivities as good as five to ten times the quantum limit in both bands. This development has been possible because high quality, high current density Nb-Al203-Nb SIS junctions became available, with areas small enough to be useful at higher frequencies.
Categories:
SIS Receivers
Year:
1995
Session:
2
Full-text:
Download a PDF of this paper.
Page Number(s):
78-85