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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November 2016
Research Article|
July 20 2016
Two-photon LIF on the HIT-SI3 experiment: Absolute density and temperature measurements of deuterium neutrals
Drew Elliott;
Drew Elliott
a)
1Department of Physics and Astronomy,
West Virginia University
, Morgantown, West Virginia 26056, USA
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Derek Sutherland
;
Derek Sutherland
2Department of Aerospace Engineering,
University of Washington
, Seattle, Washington 98105, USA
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Umair Siddiqui
;
Umair Siddiqui
1Department of Physics and Astronomy,
West Virginia University
, Morgantown, West Virginia 26056, USA
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Earl Scime
;
Earl Scime
1Department of Physics and Astronomy,
West Virginia University
, Morgantown, West Virginia 26056, USA
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Chris Everson;
Chris Everson
2Department of Aerospace Engineering,
University of Washington
, Seattle, Washington 98105, USA
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Kyle Morgan;
Kyle Morgan
2Department of Aerospace Engineering,
University of Washington
, Seattle, Washington 98105, USA
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Aaron Hossack
;
Aaron Hossack
2Department of Aerospace Engineering,
University of Washington
, Seattle, Washington 98105, USA
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Brian Nelson;
Brian Nelson
2Department of Aerospace Engineering,
University of Washington
, Seattle, Washington 98105, USA
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Tom Jarboe
Tom Jarboe
2Department of Aerospace Engineering,
University of Washington
, Seattle, Washington 98105, USA
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a)
Author to whom correspondence should be addressed. Electronic mail: dbelliott@mix.wvu.edu.
Contributed paper, published as part of the Proceedings of the 21st Topical Conference on High-Temperature Plasma Diagnostics, Madison, Wisconsin, USA, June 2016.
Rev Sci Instrum 87, 11E506 (2016)
Article history
Received:
May 31 2016
Accepted:
June 20 2016
Citation
Drew Elliott, Derek Sutherland, Umair Siddiqui, Earl Scime, Chris Everson, Kyle Morgan, Aaron Hossack, Brian Nelson, Tom Jarboe; Two-photon LIF on the HIT-SI3 experiment: Absolute density and temperature measurements of deuterium neutrals. Rev Sci Instrum 1 November 2016; 87 (11): 11E506. https://doi.org/10.1063/1.4955494
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