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- W4247366604 abstract "The Oak Ridge National Laboratory spallation neutron source (SNS) employs a high-energy proton beam incident on a liquid mercury target to generate short bursts of neutrons. Concomitant with neutron production is the rapid heating of the mercury, resulting in the formation of acoustic shock waves and the nucleation of cavitation bubbles. The subsequent collapse of these cavitation bubbles may result in the eventual erosion of the target’s steel walls. We report on preliminary measurements using two passive cavitation detectors (megahertz frequency focused and unfocused PZT transducers), installed in a mercury test target to monitor cavitation activity for proton beam energies ranging from 0.041 μC to 4.1 μC. Cavitation was initially detected for a beam “charge” of 0.205 μC by the presence of an acoustic emission approximately 120 μs after arrival of the incident beam, which is characteristic of inertial cavitation collapse. As beam energy was increased, the collapse time increased until the lifetime of the bubbles exceeded the reverberation time of the chamber (∼300 μs) at which point complex emissions signatures were detected due to the interaction of the reverberation signal and the cavitation bubbles." @default.
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- W4247366604 date "2009-04-01" @default.
- W4247366604 modified "2023-09-26" @default.
- W4247366604 title "Detecting cavitation in liquid mercury exposed to a high‐energy pulsed proton beam." @default.
- W4247366604 doi "https://doi.org/10.1121/1.4783692" @default.
- W4247366604 hasPublicationYear "2009" @default.
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