A Lagrangian model for laser-induced fluorescence and its application to measurements of plasma ion temperature and electrostatic waves

Chu, Feng; Skiff, F.

doi:10.1063/1.5020088

Title: A Lagrangian model for laser-induced fluorescence and its application to measurements of plasma ion temperature and electrostatic waves

Journal Article · Wed Jan 10 00:00:00 EST 2018 · Physics of Plasmas

DOI:https://doi.org/10.1063/1.5020088· OSTI ID:1515034

^[1]; Skiff, F. ^[1]

Univ. of Iowa, Iowa City, IA (United States). Dept. of Physics and Astronomy

Extensive information can be obtained on wave-particle interactions and wave fields by a direct measurement of perturbed ion distribution functions using laser-induced fluorescence (LIF). For practical purposes, LIF is frequently performed on metastable states that are produced from neutral gas particles and ions in other electronic states. If the laser intensity is increased to obtain a better LIF signal, then optical pumping can produce systematic effects depending on the collision rates which control metastable population and lifetime. We numerically simulate the ion velocity distribution measurement and wave-detection process using a Lagrangian model for the LIF signal for the case where metastables are produced directly from neutrals. This case requires more strict precautions and is important for discharges with energetic primary electrons and a high density of neutrals. Some of the results also apply to metastables produced from pre-existing ions. The simulations show that optical pumping broadening affects the ion velocity distribution function f₀(v) and its first-order perturbation f₁(v,t) when the laser intensity is increased above a certain level. The results also suggest that ion temperature measurements are only accurate when the metastable ions can live longer than the ion-ion collision mean free time. For the purposes of wave detection, the wave period has to be significantly shorter than the lifetime of metastable ions for a direct interpretation. It is more generally true that metastable ions may be viewed as test-particles. Finally, as long as an appropriate model is available, LIF can be extended to a range of environments.

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Research Organization:: Univ. of Iowa, Iowa City, IA (United States)

Sponsoring Organization:: USDOE

Grant/Contract Number:: FG02-99ER54543

OSTI ID:: 1515034

Alternate ID(s):: OSTI ID: 1416463

Journal Information:: Physics of Plasmas, Vol. 25, Issue 1; ISSN 1070-664X

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

Country of Publication:: United States

Language:: English

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Cited by: 11 works

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Laser-induced fluorescence saturation effects on ion velocity distribution functions in the vicinity of reflecting surfaces Pigeon, V.; Claire, N.; Arnas, C. Physics of Plasmas, Vol. 26, Issue 2 https://doi.org/10.1063/1.5077047	journal	February 2019
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Laser induced fluorescence of Ar-I metastables in the presence of a magnetic field Thompson, D. S.; Steinberger, T. E.; Keesee, A. M. Plasma Sources Science and Technology, Vol. 27, Issue 6 https://doi.org/10.1088/1361-6595/aac963	journal	June 2018
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