DEVELOPMENT OF A TWO-COLOR THOMSON AND RAYLEIGH SCATTERING DIAGNOSTIC FOR ELECTRON DENSITY MEASUREMENTS Conference Paper uri icon

abstract

  • In many weakly ionized plasmas, the application of light scattering diagnostics requires consideration of both Thomson (electron) and Rayleigh (ion, neutral and molecular) scattering processes. This study develops and demonstrates a two-color light scattering diagnostic which differentiates between the Rayleigh and Thomson scattering processes by wavelength, thereby permitting simultaneous measurement of electron and neutral/ion density without the use of a spectrometer. Unlike path-integrated diagnostics, this approach yields a spatially resolved (point) measurement of electron density. Based on a theoretical analysis of the two-color scattering diagnostic, it is found that the Thomson scattering total spectral density function can limit measurement accuracy in the coherent scattering regime. Several experimental and analytical approaches to mitigating this issue are presented.

author list (cited authors)

  • Limbach, C. M., & IEEE, ..

publication date

  • January 1, 2017 11:11 AM