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Title: A cryogenic double-resonant parabridge motion transducer for resonant-mass gravitational wave detectors

Abstract

We designed, constructed, and tested at 4.2 K (using two different low phase noise electrical pump generators) a cryogenic double-resonant parabridge motion transducer made out of niobium, whose electrical output was amplified by a two-stage metal-semiconductor field-effect transistor cryogenic amplifier. Most of the experimental results agreed well with the theoretical models. We were able to adjust the two electrical bridge resonant frequencies at the pump frequency, allowing us to obtain an electromechanical coupling as high as 0.054, and we successfully measured the mechanical Brownian motion of this transducer. In one case, we observed a dip in the electrical noise spectrum near the mechanical resonant frequency due to destructive interference between this noise and its reflection'' from the mechanical resonator. At the bottom of this dip, in a bandwidth of 0.7 Hz, we measured an equivalent displacement noise of 4 {times} 10{sup {minus}16} m/{radical}Hz with a systematic error of less than 10%.

Authors:
; ;  [1]
  1. Louisiana State University, Baton Rouge, Louisiana (USA). Department of Physics and Astronomy Louisiana State University, Baton Rouge, Louisiana (USA). Experimental Gravitation Group
Publication Date:
OSTI Identifier:
5104268
Resource Type:
Journal Article
Journal Name:
Review of Scientific Instruments; (United States)
Additional Journal Information:
Journal Volume: 62:11; Journal ID: ISSN 0034-6748
Country of Publication:
United States
Language:
English
Subject:
71 CLASSICAL AND QUANTUM MECHANICS, GENERAL PHYSICS; GRAVITATIONAL WAVE DETECTORS; TRANSDUCERS; DESIGN; ELECTRIC BRIDGES; RESONANCE; ULTRALOW TEMPERATURE; ELECTRICAL EQUIPMENT; EQUIPMENT; MEASURING INSTRUMENTS; RADIATION DETECTORS; 640106* - Astrophysics & Cosmology- Cosmology

Citation Formats

Aguiar, O D, Johnson, W W, and Hamilton, W O. A cryogenic double-resonant parabridge motion transducer for resonant-mass gravitational wave detectors. United States: N. p., 1991. Web. doi:10.1063/1.1142226.
Aguiar, O D, Johnson, W W, & Hamilton, W O. A cryogenic double-resonant parabridge motion transducer for resonant-mass gravitational wave detectors. United States. doi:10.1063/1.1142226.
Aguiar, O D, Johnson, W W, and Hamilton, W O. Fri . "A cryogenic double-resonant parabridge motion transducer for resonant-mass gravitational wave detectors". United States. doi:10.1063/1.1142226.
@article{osti_5104268,
title = {A cryogenic double-resonant parabridge motion transducer for resonant-mass gravitational wave detectors},
author = {Aguiar, O D and Johnson, W W and Hamilton, W O},
abstractNote = {We designed, constructed, and tested at 4.2 K (using two different low phase noise electrical pump generators) a cryogenic double-resonant parabridge motion transducer made out of niobium, whose electrical output was amplified by a two-stage metal-semiconductor field-effect transistor cryogenic amplifier. Most of the experimental results agreed well with the theoretical models. We were able to adjust the two electrical bridge resonant frequencies at the pump frequency, allowing us to obtain an electromechanical coupling as high as 0.054, and we successfully measured the mechanical Brownian motion of this transducer. In one case, we observed a dip in the electrical noise spectrum near the mechanical resonant frequency due to destructive interference between this noise and its reflection'' from the mechanical resonator. At the bottom of this dip, in a bandwidth of 0.7 Hz, we measured an equivalent displacement noise of 4 {times} 10{sup {minus}16} m/{radical}Hz with a systematic error of less than 10%.},
doi = {10.1063/1.1142226},
journal = {Review of Scientific Instruments; (United States)},
issn = {0034-6748},
number = ,
volume = 62:11,
place = {United States},
year = {1991},
month = {11}
}