Astronomy and Astrophysics – Astronomy
Scientific paper
Mar 1985
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1985rsci...56..449a&link_type=abstract
Review of Scientific Instruments (ISSN 0034-6748), vol. 56, March 1985, p. 449-458.
Astronomy and Astrophysics
Astronomy
6
Cryostats, Liquid Helium, Microwave Sensors, Mixing Circuits, Radio Receivers, Sis (Semiconductors), Avalanche Diodes, Block Diagrams, Cryogenic Cooling, Cryogenic Equipment, Heterodyning, Radio Astronomy, Schottky Diodes, Vapor Pressure, Volt-Ampere Characteristics
Scientific paper
A hybrid cryostat is described which was designed to cool two SIS mixers in a 100-120-GHz dual polarization receiver. A mechanical refrigerator is used to cool radiation shields surrounding a 4.3-1 capacity metal tank containing liquid helium (He4). The temperature of the liquid can be lowered to 2.5 K by reducing the helium vapor pressure in the tank with the aid of a mechanical vacuum pump. A liquid hold time, at 2.5 K, of longer than five days has been achieved. With the mixers cooled to 2.5 K and L-band GaAs FET IF amplifiers cooled to 20 K, single sideband receiver temperatures of less than 120 K have been measured, with greater than 15-dB image rejection and a useful instantaneous bandwidth of 500 MHz.
Archer John W.
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