A diagnostic to measure neutral-atom density in fusion-research plasmas

A. Dogariu; S. A. Cohen; P. Jandovitz; S. Vinoth; E. S. Evans; C. P.S. Swanson

doi:10.1063/5.0101683

A diagnostic to measure neutral-atom density in fusion-research plasmas

A. Dogariu, S. A. Cohen, P. Jandovitz, S. Vinoth, E. S. Evans, C. P.S. Swanson

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4 Scopus citations

Abstract

A femtosecond two-photon-absorption laser-induced-fluorescence (TALIF) diagnostic was designed, installed, and operated on the Princeton-Field-Reversed Configuration-2 device to provide non-invasive measurements of the time and spatially resolved neutral-atom densities in its plasmas. Calibration of the Ho density was accomplished by comparison with Kr TALIF. Measurements on plasmas formed of either H2 or Kr fill gases allowed examination of nominally long and short ionization mean-free-path regimes. With multi-kW plasma heating and H2 fill gas, a spatially uniform Ho density of order 1017 m-3 was measured with better than ±2 mm and 10 μs resolution. Under similar plasma conditions but with Kr fill gas, a 3-fold decrease in the in-plasma Kr density was observed.

Original language	English (US)
Article number	093519
Journal	Review of Scientific Instruments
Volume	93
Issue number	9
DOIs	https://doi.org/10.1063/5.0101683
State	Published - Sep 1 2022

All Science Journal Classification (ASJC) codes

Instrumentation

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10.1063/5.0101683

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title = "A diagnostic to measure neutral-atom density in fusion-research plasmas",

abstract = "A femtosecond two-photon-absorption laser-induced-fluorescence (TALIF) diagnostic was designed, installed, and operated on the Princeton-Field-Reversed Configuration-2 device to provide non-invasive measurements of the time and spatially resolved neutral-atom densities in its plasmas. Calibration of the Ho density was accomplished by comparison with Kr TALIF. Measurements on plasmas formed of either H2 or Kr fill gases allowed examination of nominally long and short ionization mean-free-path regimes. With multi-kW plasma heating and H2 fill gas, a spatially uniform Ho density of order 1017 m-3 was measured with better than ±2 mm and 10 μs resolution. Under similar plasma conditions but with Kr fill gas, a 3-fold decrease in the in-plasma Kr density was observed.",

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T1 - A diagnostic to measure neutral-atom density in fusion-research plasmas

AU - Dogariu, A.

AU - Cohen, S. A.

AU - Jandovitz, P.

AU - Vinoth, S.

AU - Evans, E. S.

AU - Swanson, C. P.S.

PY - 2022/9/1

Y1 - 2022/9/1

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AB - A femtosecond two-photon-absorption laser-induced-fluorescence (TALIF) diagnostic was designed, installed, and operated on the Princeton-Field-Reversed Configuration-2 device to provide non-invasive measurements of the time and spatially resolved neutral-atom densities in its plasmas. Calibration of the Ho density was accomplished by comparison with Kr TALIF. Measurements on plasmas formed of either H2 or Kr fill gases allowed examination of nominally long and short ionization mean-free-path regimes. With multi-kW plasma heating and H2 fill gas, a spatially uniform Ho density of order 1017 m-3 was measured with better than ±2 mm and 10 μs resolution. Under similar plasma conditions but with Kr fill gas, a 3-fold decrease in the in-plasma Kr density was observed.

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A diagnostic to measure neutral-atom density in fusion-research plasmas

Abstract

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