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<p>Comprehending the dynamics of dust acoustic modes and the ability to tune their effective parameters facilitates the optimization of plasma phenomena and structures, while also providing deeper insights into the underlying physics of oscillations involving massive charged grains. In this study, we investigate the influence of cathode potential on the evolution of dust ion acoustic (DIA) waves in a multicomponent dusty plasma containing a separate electron beam (e-beam). Our analysis reveals that cathode potential plays a crucial role in modulating the effect of the e-beam on DIA mode dynamics. Notably, at a specific cathode potential, denoted as <InlineEquation ID="IEq1"> <EquationSource Format="TEX">\(\:{\varphi\:}_{CN}\)</EquationSource> </InlineEquation>, the contribution of the e-beam to DIA wave propagation becomes negligible. Numerical results indicate that <InlineEquation ID="IEq2"> <EquationSource Format="TEX">\(\:{\varphi\:}_{CN}\)</EquationSource> </InlineEquation> gradually increases with rising concentration of negatively charged grains, a trend that becomes more pronounced at elevated electron temperatures. Furthermore, in plasmas containing negatively charged grains, increasing the electron number density induces a nonlinear decrease in <InlineEquation ID="IEq3"> <EquationSource Format="TEX">\(\:{\varphi\:}_{CN}\)</EquationSource> </InlineEquation>, conversely, in plasmas with positively charged dust grains, the opposite trend is observed. Our findings offer an effective strategy for manipulating e-beam-induced modifications in DIA mode behavior.</p>

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Regulation of the Impact of Electron Beam on the Propagation of Dust-Ion Acoustic Waves

  • 期刊论文

  • 发表日期：

    2025年12月19日

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  • Amir Mohammad Ahadi

摘要

Comprehending the dynamics of dust acoustic modes and the ability to tune their effective parameters facilitates the optimization of plasma phenomena and structures, while also providing deeper insights into the underlying physics of oscillations involving massive charged grains. In this study, we investigate the influence of cathode potential on the evolution of dust ion acoustic (DIA) waves in a multicomponent dusty plasma containing a separate electron beam (e-beam). Our analysis reveals that cathode potential plays a crucial role in modulating the effect of the e-beam on DIA mode dynamics. Notably, at a specific cathode potential, denoted as \(\:{\varphi\:}_{CN}\) , the contribution of the e-beam to DIA wave propagation becomes negligible. Numerical results indicate that \(\:{\varphi\:}_{CN}\) gradually increases with rising concentration of negatively charged grains, a trend that becomes more pronounced at elevated electron temperatures. Furthermore, in plasmas containing negatively charged grains, increasing the electron number density induces a nonlinear decrease in \(\:{\varphi\:}_{CN}\) , conversely, in plasmas with positively charged dust grains, the opposite trend is observed. Our findings offer an effective strategy for manipulating e-beam-induced modifications in DIA mode behavior.