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Abstract <p>An acoustoplasma discharge is experimentally investigated when low-intensity acoustic oscillations are far from the intensity region where shock waves exist. The frequency range of 20–50&#xa0;kHz is considered, when non-axial modes, rather than a plane longitudinal wave, propagate in the discharge tube. The discharge trajectory in the tube is shown to take the form of a planar sinusoid. The calculated and experimentally measured spectra of acoustic oscillations arising during discharge current modulation and sound dispersion for non-axial modes are presented. The dispersion is found to be significant. The spectrum of non-axial modes has a band structure. In acoustoplasma, the transition from one frequency band to the next is characterized by a phase transition. Within each band, dispersion can be either normal or anomalous, depending on the frequency. When moving from one band to the next, dispersion becomes anomalous.</p>

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Dispersion of Acoustic Waves in Xenon Acoustoplasma in the Region of Non-Axial Acoustic Modes

  • 期刊论文

  • 发表日期：

    2025年9月1日

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  • A. S. Abrahamyan,
  • R. Yu. Chilingaryan,
  • K. G. Sahakyan,
  • M. H. Sargsyan

摘要

Abstract

An acoustoplasma discharge is experimentally investigated when low-intensity acoustic oscillations are far from the intensity region where shock waves exist. The frequency range of 20–50 kHz is considered, when non-axial modes, rather than a plane longitudinal wave, propagate in the discharge tube. The discharge trajectory in the tube is shown to take the form of a planar sinusoid. The calculated and experimentally measured spectra of acoustic oscillations arising during discharge current modulation and sound dispersion for non-axial modes are presented. The dispersion is found to be significant. The spectrum of non-axial modes has a band structure. In acoustoplasma, the transition from one frequency band to the next is characterized by a phase transition. Within each band, dispersion can be either normal or anomalous, depending on the frequency. When moving from one band to the next, dispersion becomes anomalous.