Continuous wave cavity ring-down spectroscopy for velocity distribution measurements in plasma

D McCarren; E Scime

doi:10.1063/1.4932313

Continuous wave cavity ring-down spectroscopy for velocity distribution measurements in plasma

Rev Sci Instrum. 2015 Oct;86(10):103505. doi: 10.1063/1.4932313.

Authors

D McCarren¹, E Scime¹

Affiliation

¹ Department of Physics and Astronomy, West Virginia University, Morgantown, West Virginia 26506, USA.

PMID: 26520953
DOI: 10.1063/1.4932313

Abstract

We report the development of a continuous wave cavity ring-down spectroscopic (CW-CRDS) diagnostic for real-time, in situ measurement of velocity distribution functions of ions and neutral atoms in plasma. This apparatus is less complex than conventional CW-CRDS systems. We provide a detailed description of the CW-CRDS apparatus as well as measurements of argon ions and neutrals in a high-density (10(9) cm(-3) < plasma density <10(13) cm(-3)) plasma. The CW-CRDS measurements are validated through comparison with laser induced fluorescence measurements of the same absorbing states of the ions and neutrals.