Two-photon LIF on the HIT-SI3 experiment: Absolute density and temperature measurements of deuterium neutrals

Drew Elliott; Derek Sutherland; Umair Siddiqui; Earl Scime; Chris Everson; Kyle Morgan; Aaron Hossack; Brian Nelson; Tom Jarboe

doi:10.1063/1.4955494

Two-photon LIF on the HIT-SI3 experiment: Absolute density and temperature measurements of deuterium neutrals

Drew Elliott, Derek Sutherland, Umair Siddiqui, Earl Scime, Chris Everson, Kyle Morgan, Aaron Hossack, Brian Nelson, Tom Jarboe

Research output: Contribution to journal › Article › peer-review

6 Scopus citations

Abstract

Two-photon laser-induced fluorescence measurements were performed on the helicity injected torus (HIT-SI3) device to determine the density and temperature of the background neutral deuterium population. Measurements were taken in 2 ms long pulsed plasmas after the inductive helicity injectors were turned off. Attempts to measure neutrals during the main phase of the plasma were unsuccessful, likely due to the density of neutrals being below the detection threshold of the diagnostic. An unexpectedly low density of atomic deuterium was measured in the afterglow; roughly 100 times lower than the theoretical prediction of 10¹⁷ m^-3. The neutral temperatures measured were on the order of 1 eV. Temporally and spatially resolved neutral density and temperature data are presented.

Original language	English
Article number	11E506
Journal	Review of Scientific Instruments
Volume	87
Issue number	11
DOIs	https://doi.org/10.1063/1.4955494
State	Published - Nov 1 2016
Externally published	Yes

Funding

This work was supported by Department of Energy Award No. DE-SC0004736, Office of Fusion Energy Science Award No. DE-FG02-96ER54361e and NSF Award No. PHYS- 1360278.

Funders	Funder number
Office of Fusion Energy Science
National Science Foundation	PHYS- 1360278, 1360278
U.S. Department of Energy	DE-SC0004736

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title = "Two-photon LIF on the HIT-SI3 experiment: Absolute density and temperature measurements of deuterium neutrals",

abstract = "Two-photon laser-induced fluorescence measurements were performed on the helicity injected torus (HIT-SI3) device to determine the density and temperature of the background neutral deuterium population. Measurements were taken in 2 ms long pulsed plasmas after the inductive helicity injectors were turned off. Attempts to measure neutrals during the main phase of the plasma were unsuccessful, likely due to the density of neutrals being below the detection threshold of the diagnostic. An unexpectedly low density of atomic deuterium was measured in the afterglow; roughly 100 times lower than the theoretical prediction of 1017 m-3. The neutral temperatures measured were on the order of 1 eV. Temporally and spatially resolved neutral density and temperature data are presented.",

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AU - Elliott, Drew

AU - Sutherland, Derek

AU - Siddiqui, Umair

AU - Scime, Earl

AU - Everson, Chris

AU - Morgan, Kyle

AU - Hossack, Aaron

AU - Nelson, Brian

AU - Jarboe, Tom

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AB - Two-photon laser-induced fluorescence measurements were performed on the helicity injected torus (HIT-SI3) device to determine the density and temperature of the background neutral deuterium population. Measurements were taken in 2 ms long pulsed plasmas after the inductive helicity injectors were turned off. Attempts to measure neutrals during the main phase of the plasma were unsuccessful, likely due to the density of neutrals being below the detection threshold of the diagnostic. An unexpectedly low density of atomic deuterium was measured in the afterglow; roughly 100 times lower than the theoretical prediction of 1017 m-3. The neutral temperatures measured were on the order of 1 eV. Temporally and spatially resolved neutral density and temperature data are presented.

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Two-photon LIF on the HIT-SI3 experiment: Absolute density and temperature measurements of deuterium neutrals

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