Question about kinetic theory and hydrodynamics (in plasmas)

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SUMMARY

The discussion centers on the integration of kinetic theory for electron fluids and hydrodynamic theory for ion fluids in plasma physics. This dual approach is commonly employed to analyze plasma properties and the dynamics of electrostatic waves. However, there is skepticism regarding its prevalence, as one participant notes a lack of exposure to this methodology during their PhD studies in plasma physics. The conversation highlights the need for clarity on the contexts in which this combined approach is deemed "usual."

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zaki belh
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It is usual, in plasma physics, to combine the kinetic description for electron fluid and the hydrodynamic description for ion fluid, when studying the plasma properties or the dynamics of the electrostatic waves.
I am wondering what are the physical meaning and limits of such an approach.
Thanks.
 
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I find your question curious. In what context do you find it is “usual” to use kinetic theory for electrons and fluid theory for ions?I did my PhD in plasma physics and do not recall seeing this approach. All of my research was on space plasmas, but the pure plasma physics coursework I took was general since it was taken by students with many interests (fusion, space physics, semiconductor processing, etc).
 
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