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Title: 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 mm 2 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:
ORCiD logo [1]; ORCiD logo [1];  [1]; ORCiD logo [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) (SC-24)
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. doi: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. doi: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 = {2018},
month = {8}
}

Journal Article:
Free Publicly Available Full Text
Publisher's Version of Record

Figures / Tables:

FIG. 1 FIG. 1: Schematic of the layout of the $\tilde{𝐸}$ diagnostic.

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Works referenced in this record:

The beam emission spectroscopy diagnostic on the DIII-D tokamak
journal, January 1999

  • McKee, G.; Ashley, R.; Durst, R.
  • Review of Scientific Instruments, Vol. 70, Issue 1
  • DOI: 10.1063/1.1149416

High-resolution fast-beam spectroscopy using an off-axis Fabry-Perot interferometer
journal, July 1973


Magnetic field pitch-angle measurments in the PBX-M tokamak using the motional Stark effect
journal, November 1989


Plasma fluctuation measurements in tokamaks using beam‐plasma interactions
journal, November 1990

  • Fonck, R. J.; Duperrex, P. A.; Paul, S. F.
  • Review of Scientific Instruments, Vol. 61, Issue 11
  • DOI: 10.1063/1.1141556

Density fluctuation measurements via beam emission spectroscopy (invited)
journal, October 1992

  • Durst, R. D.; Fonck, R. J.; Cosby, G.
  • Review of Scientific Instruments, Vol. 63, Issue 10
  • DOI: 10.1063/1.1143546

Measurements of ion temperature fluctuations in the Tokamak Fusion Test Reactor
journal, February 1998


Fluctuation-Induced Energy Flux in the Tokamak Edge
journal, April 1989


Spatial heterodyne spectroscopy for the exploration of diffuse interstellar emission lines at far-ultraviolet wavelengths
journal, September 1992

  • Harlander, J.; Reynolds, R. J.; Roesler, F. L.
  • The Astrophysical Journal, Vol. 396
  • DOI: 10.1086/171756

Space Potential Distribution in the ISX-B Tokamak
journal, March 1986


Spatial heterodyne spectroscopy at the Naval Research Laboratory
journal, January 2015

  • Englert, Christoph R.; Harlander, John M.; Brown, Charles M.
  • Applied Optics, Vol. 54, Issue 31
  • DOI: 10.1364/ao.54.00f158

Ultrafast ion temperature and toroidal velocity fluctuation spectroscopy diagnostic design
journal, October 2008

  • McKee, G. R.; Schlossberg, D. J.; Shafer, M. W.
  • Review of Scientific Instruments, Vol. 79, Issue 10
  • DOI: 10.1063/1.2974808

    Works referencing / citing this record:

    High-resolution fast-beam spectroscopy using an off-axis Fabry-Perot interferometer
    journal, July 1973


    Plasma fluctuation measurements in tokamaks using beam‐plasma interactions
    journal, November 1990

    • Fonck, R. J.; Duperrex, P. A.; Paul, S. F.
    • Review of Scientific Instruments, Vol. 61, Issue 11
    • DOI: 10.1063/1.1141556

    Density fluctuation measurements via beam emission spectroscopy (invited)
    journal, October 1992

    • Durst, R. D.; Fonck, R. J.; Cosby, G.
    • Review of Scientific Instruments, Vol. 63, Issue 10
    • DOI: 10.1063/1.1143546

    The beam emission spectroscopy diagnostic on the DIII-D tokamak
    journal, January 1999

    • McKee, G.; Ashley, R.; Durst, R.
    • Review of Scientific Instruments, Vol. 70, Issue 1
    • DOI: 10.1063/1.1149416

    Ultrafast ion temperature and toroidal velocity fluctuation spectroscopy diagnostic design
    journal, October 2008

    • McKee, G. R.; Schlossberg, D. J.; Shafer, M. W.
    • Review of Scientific Instruments, Vol. 79, Issue 10
    • DOI: 10.1063/1.2974808

    Spatial heterodyne spectroscopy for the exploration of diffuse interstellar emission lines at far-ultraviolet wavelengths
    journal, September 1992

    • Harlander, J.; Reynolds, R. J.; Roesler, F. L.
    • The Astrophysical Journal, Vol. 396
    • DOI: 10.1086/171756

    Measurements of ion temperature fluctuations in the Tokamak Fusion Test Reactor
    journal, February 1998


    Space Potential Distribution in the ISX-B Tokamak
    journal, March 1986


    Fluctuation-Induced Energy Flux in the Tokamak Edge
    journal, April 1989


    Magnetic field pitch-angle measurments in the PBX-M tokamak using the motional Stark effect
    journal, November 1989


    Spatial heterodyne spectroscopy at the Naval Research Laboratory
    journal, January 2015

    • Englert, Christoph R.; Harlander, John M.; Brown, Charles M.
    • Applied Optics, Vol. 54, Issue 31
    • DOI: 10.1364/ao.54.00f158

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