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Continuous-wave planar laser induced fluorescence with a fast camera.

M C Paul1, E E Scime1

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Summary
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Planar laser-induced fluorescence (PLIF) measures ion velocity distributions in plasma. This technique images an entire plasma plane, providing detailed temperature and flow maps for plasma diagnostics.

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Area of Science:

  • Plasma physics
  • Atomic and molecular physics
  • Laser diagnostics

Background:

  • Accurate measurement of ion velocity distribution functions is crucial for understanding plasma behavior.
  • Traditional single-point laser-induced fluorescence (LIF) methods are time-consuming for mapping spatial distributions.
  • Developing advanced diagnostic techniques is essential for characterizing complex plasma environments.

Purpose of the Study:

  • To present a novel planar laser-induced fluorescence (PLIF) technique for measuring velocity-resolved ion distribution functions.
  • To demonstrate the capability of PLIF for imaging an entire plane of plasma.
  • To validate the PLIF technique against standard single-point LIF measurements.

Main Methods:

  • Utilized a modulated, narrow linewidth, continuous-wave laser to excite plasma ions.
  • Employed a high frame rate camera to acquire plasma emission.
  • Spread the laser light into a thin sheet to image a full plane of the plasma.
  • Applied Fourier analysis to pixel data to separate modulated fluorescence from background light.

Main Results:

  • Successfully measured velocity-resolved ion distribution functions across an entire plasma plane.
  • Generated detailed maps of ion temperatures and bulk flows in a helicon plasma source.
  • Validated the accuracy of the PLIF technique using established single-point LIF measurements.

Conclusions:

  • The presented PLIF technique offers a significant advancement for spatially resolved plasma diagnostics.
  • PLIF enables efficient and comprehensive mapping of ion dynamics, including temperature and flow.
  • This method provides a robust tool for validating and enhancing our understanding of plasma physics.