Spatiotemporal measurements of striations in a glow discharge’s positive column using laser-collisional induced fluorescence

White, Zachary K.; Gott, Ryan P.; Bentz, Brian Zahler; Xu, Kunning G.

doi:10.1063/5.0096695

Spatiotemporal measurements of striations in a glow discharge’s positive column using laser-collisional induced fluorescence

Journal Article · Wed Aug 09 00:00:00 EDT 2023 · AIP Advances

DOI:https://doi.org/10.1063/5.0096695· OSTI ID:2311451

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University of Alabama, Huntsville, AL (United States)
NASA Postdoctoral Program, Merritt Island, FL (United States)
Sandia National Laboratory (SNL-NM), Albuquerque, NM (United States)

Here we have observed the behavior of striations caused by ionization waves propagating in low-pressure helium DC discharges using the non-invasive laser-collision induced fluorescence (LCIF) diagnostic. To achieve this, we developed an analytic fit of collisional radiative model (CRM) predictions to interpret the LCIF data and recover quantitative two-dimensional spatial maps of the electron density, n_e, and the ratios of LCIF emission states that can be correlated with T_e with the use of accurate distribution functions at localized positions within striated helium discharges at 500 mTorr, 750 mTorr, and 1 Torr. To our knowledge, these are the first spatiotemporal, laser-based, experimental measurements of n_e in DC striations. The n_e and 447:588 ratio distributions align closely with striation theory. Constriction of the positive column appears to occur with decreased gas pressure, as shown by the radial n_e distribution. We identify a transition from a slow ionization wave to a fast ionization wave between 750 mTorr and 1 Torr. These experiments validate our analytic fit of n_e, allowing the implementation of an LCIF diagnostic in helium without the need to develop a CRM.

View Accepted Manuscript (DOE)

Research Organization:: Sandia National Laboratories (SNL-NM), Albuquerque, NM (United States)

Sponsoring Organization:: USDOE National Nuclear Security Administration (NNSA); USDOE Office of Science (SC), Fusion Energy Sciences (FES); National Science Foundation (NSF); USDOE Office of Science (SC), Office of Workforce Development for Teachers & Scientists (WDTS)

Grant/Contract Number:: NA0003525; SC0014664; SC0020232

OSTI ID:: 2311451

Report Number(s):: SAND--2023-08996J

Journal Information:: AIP Advances, Journal Name: AIP Advances Journal Issue: 8 Vol. 13; ISSN 2158-3226

Publisher:: American Institute of Physics (AIP)Copyright Statement

Country of Publication:: United States

Language:: English

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Spatiotemporal measurements of striations in a glow discharge’s positive column using laser-collisional induced fluorescence

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