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Instruments to measure plasmas besides Langmuir probes?

  1. Mar 17, 2015 #1

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    If a plasma is created at one end of a solenoid and heads down towards a target with a density and temperature too high for Langmuir probes, what other instruments can measure the density with a strong signal that is easy to interpret?
     
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  3. Mar 23, 2015 #2
    Thanks for the post! This is an automated courtesy bump. Sorry you aren't generating responses at the moment. Do you have any further information, come to any new conclusions or is it possible to reword the post?
     
  4. Mar 24, 2015 #3

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    To be more specific, the plasma has a density <5x10^19/m^3 and 10eV temperature.

    I was thinking either capacitive probes as, depending on the design, these can work in hotter/denser plasmas than Langmuir probes. They are really just a Langmuir probe without an exposed metallic tip when it comes down to it though, and work on a similar principle.

    Also, perhaps millimeter-wave interferometry because when a microwave signal is passed through the plasma, where wave-particle interactions with the electrons cause a phase shift in the signal. The phase shift between this signal and a reference beam path is measured, and density information can be inferred.
     
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