Spatial heterodyne spectroscopy for high speed measurements of Stark split neutral beam emission in a high temperature plasma
Abstract
Measurement of electrostatic potential, or local electric field, turbulence is a critical missing component in validating nonlinear turbulence and transport simulations of fusion plasmas. A novel diagnostic is being developed for measuring local electric field fluctuations, $$\sim\atop{E}$$(r,t), via high-speed measurements of the light emitted from a hydrogenic neutral beam. It exploits the proportionality of the spectral line splitting from the Motional Stark Effect to the total electric field experienced by the neutral atom at the excitation site. The measurement is localized by the usual cross-beam geometry of beam-spectroscopy measurements. The corner stone of the diagnostic is a high spectral resolution, high etendue spatial heterodyne spectrometer (SHS). A SHS design with high etendue (~5 mm2 sr) and resolution (~0.14 nm) meets the formidable spectrometer requirements. Field tests of the spectrometer at the DIII-D tokamak demonstrate that the beam emission spectrum produced by the SHS agrees with that of a traditional spectrometer and that the measured flux is adequate for turbulence studies.
- Authors:
-
[1];
[1];
[1]
- Univ. of Wisconsin, Madison, WI (United States). Dept. of Engineering Physics
- Publication Date:
- Research Org.:
- Univ. of Wisconsin-Madison, Stoughton, WI (United States). Synchrotron Radiation Center (SRC)
- Sponsoring Org.:
- USDOE Office of Science (SC), Fusion Energy Sciences (FES)
- OSTI Identifier:
- 1515855
- Alternate Identifier(s):
- OSTI ID: 1467140
- Grant/Contract Number:
- FG02-89ER53296; FC02-04ER54698
- Resource Type:
- Accepted Manuscript
- Journal Name:
- Review of Scientific Instruments
- Additional Journal Information:
- Journal Volume: 89; Journal Issue: 10; Related Information: Public Data Set: Spatial Heterodyne Spectroscopy for High Speed Measurements of Stark Split Neutral Beam Emission in a High Temperature Plasma, DOI: 10.18138/1435641; Journal ID: ISSN 0034-6748
- Publisher:
- American Institute of Physics (AIP)
- Country of Publication:
- United States
- Language:
- English
- Subject:
- 70 PLASMA PHYSICS AND FUSION TECHNOLOGY
Citation Formats
Burke, Marcus G., Fonck, Raymond J., McKee, George R., and Winz, Gregory R. Spatial heterodyne spectroscopy for high speed measurements of Stark split neutral beam emission in a high temperature plasma. United States: N. p., 2018.
Web. doi:10.1063/1.5039285.
Burke, Marcus G., Fonck, Raymond J., McKee, George R., & Winz, Gregory R. Spatial heterodyne spectroscopy for high speed measurements of Stark split neutral beam emission in a high temperature plasma. United States. https://doi.org/10.1063/1.5039285
Burke, Marcus G., Fonck, Raymond J., McKee, George R., and Winz, Gregory R. Tue .
"Spatial heterodyne spectroscopy for high speed measurements of Stark split neutral beam emission in a high temperature plasma". United States. https://doi.org/10.1063/1.5039285. https://www.osti.gov/servlets/purl/1515855.
@article{osti_1515855,
title = {Spatial heterodyne spectroscopy for high speed measurements of Stark split neutral beam emission in a high temperature plasma},
author = {Burke, Marcus G. and Fonck, Raymond J. and McKee, George R. and Winz, Gregory R.},
abstractNote = {Measurement of electrostatic potential, or local electric field, turbulence is a critical missing component in validating nonlinear turbulence and transport simulations of fusion plasmas. A novel diagnostic is being developed for measuring local electric field fluctuations, $\sim\atop{E}$(r,t), via high-speed measurements of the light emitted from a hydrogenic neutral beam. It exploits the proportionality of the spectral line splitting from the Motional Stark Effect to the total electric field experienced by the neutral atom at the excitation site. The measurement is localized by the usual cross-beam geometry of beam-spectroscopy measurements. The corner stone of the diagnostic is a high spectral resolution, high etendue spatial heterodyne spectrometer (SHS). A SHS design with high etendue (~5 mm2 sr) and resolution (~0.14 nm) meets the formidable spectrometer requirements. Field tests of the spectrometer at the DIII-D tokamak demonstrate that the beam emission spectrum produced by the SHS agrees with that of a traditional spectrometer and that the measured flux is adequate for turbulence studies.},
doi = {10.1063/1.5039285},
journal = {Review of Scientific Instruments},
number = 10,
volume = 89,
place = {United States},
year = {Tue Aug 28 00:00:00 EDT 2018},
month = {Tue Aug 28 00:00:00 EDT 2018}
}
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Cited by: 4 works
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Figures / Tables:
FIG. 1: Schematic of the layout of the $\tilde{𝐸}$ diagnostic.
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Works referenced in this record:
Public Data Set: Spatial Heterodyne Spectroscopy for High Speed Measurements of Stark Split Neutral Beam Emission in a High Temperature Plasma
dataset, January 2018
- Burke, Marcus; Fonck, Raymond; McKee, George
- University of Wisconsin-Madison
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Public Data Set: Spatial Heterodyne Spectroscopy for High Speed Measurements of Stark Split Neutral Beam Emission in a High Temperature Plasma
dataset, January 2018
- Burke, Marcus; Fonck, Raymond; McKee, George
- University of Wisconsin-Madison
Works referencing / citing this record:
Public Data Set: Spatial Heterodyne Spectroscopy for High Speed Measurements of Stark Split Neutral Beam Emission in a High Temperature Plasma
dataset, January 2018
- Burke, Marcus; Fonck, Raymond; McKee, George
- University of Wisconsin-Madison
Figures / Tables found in this record:
Figures/Tables have been extracted from DOE-funded journal article accepted manuscripts.