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X-band ultralow-noise maser amplifier performanceNoise temperature measurements of an 8440-MHz ultralow noise maser amplifier (ULNA) have been performed at subatmospheric, liquid-helium temperatures. The traveling-wave maser was operated while immersed in a liquid helium bath. The lowest input noise temperature measured was 1.43 +/- 0.16 K at a physical temperature of 1.60 K. At this physical temperature, the observed gain per centimeter of ruby was 4.9 dB/cm. The amplifier had a 3-dB bandwidth of 76 MHz.
Document ID
19940025169
Acquisition Source
Legacy CDMS
Document Type
Reprint (Version printed in journal)
Authors
Glass, G. W. (Jet Propulsion Lab., California Inst. of Tech. Pasadena, CA, United States)
Ortiz, G. G. (Jet Propulsion Lab., California Inst. of Tech. Pasadena, CA, United States)
Johnson, D. L. (Jet Propulsion Lab., California Inst. of Tech. Pasadena, CA, United States)
Date Acquired
September 6, 2013
Publication Date
February 15, 1994
Publication Information
Publication: The Telecommunications and Data Acquisition Report 246-253 (SEE N94-29652 08-32)
Subject Category
Lasers And Masers
Accession Number
94N29672
Funding Number(s)
PROJECT: RTOP 310-20-66-53-00
Distribution Limits
Public
Copyright
Work of the US Gov. Public Use Permitted.

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