Planar laser-induced fluorescence system for spatiotemporal ion velocity distribution function measurements

Son, S. H.; Romadanov, I.; Chopra, N. S.; Raitses, Y.

doi:10.1088/1361-6595/ae0963

Planar laser-induced fluorescence system for spatiotemporal ion velocity distribution function measurements

Journal Article · Mon Oct 06 00:00:00 EDT 2025 · Plasma Sources Science and Technology

DOI:https://doi.org/10.1088/1361-6595/ae0963· OSTI ID:2999373

^[1]; ^[2]; Chopra, N. S. ^[1]; ^[2]

Princeton Univ., NJ (United States); Princeton Plasma Physics Laboratory (PPPL), Princeton, NJ (United States)
Princeton Plasma Physics Laboratory (PPPL), Princeton, NJ (United States)

In this work, we present a planar laser-induced fluorescence (PLIF) system for measuring two-dimensional (2D), spatiotemporally resolved ion velocity distribution functions (IVDFs). A continuous-wave tunable diode laser produces a laser sheet that irradiates the plasma, and the resulting fluorescence is captured by an intensified CCD (ICCD) camera. Fluorescence images recorded at varying laser wavelengths are converted into 2D IVDFs using the Doppler shift principle. The developed diagnostic is implemented in an electron beam generated E × B plasma with a bulk plasma density of $$\sim\!\!{10^{10}}{\text{c}}{{\text{m}}^{ - 3}}$$ . The developed diagnostic is validated against a conventional single-point LIF method using photomultiplier tube-based detection, while significantly reducing the total measurement time by the number of spatial positions measured. The time-resolving capability of this diagnostic is tested by oscillating the plasma between two nominal operating modes with different density profiles and triggering the ICCD camera by the externally driven plasma oscillation. The measured 2D IVDF maps reveal several signatures of ion dynamics in this plasma source, including radially outflowing ions across the electric field and anomalous ion heating at the periphery, consistent with recent kinetic simulations and theoretical studies. A possible correlation between these ion kinetic features and rotating spoke structures is discussed.

View Accepted Manuscript (DOE)

Research Organization:: Princeton Plasma Physics Laboratory (PPPL), Princeton, NJ (United States)

Sponsoring Organization:: USDOE Office of Science (SC), Fusion Energy Sciences (FES)

Grant/Contract Number:: AC02-09CH11466

OSTI ID:: 2999373

Journal Information:: Plasma Sources Science and Technology, Journal Name: Plasma Sources Science and Technology Journal Issue: 10 Vol. 34; ISSN 0963-0252; ISSN 1361-6595

Publisher:: IOP PublishingCopyright Statement

Country of Publication:: United States

Language:: English

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