Spatio-temporal ion temperature and velocity measurements in a Z pinch using fast-framing spectroscopy

Forbes, E. G.; Shumlak, U.

doi:10.1063/5.0012255

Title: Spatio-temporal ion temperature and velocity measurements in a Z pinch using fast-framing spectroscopy

Abstract

Ion Doppler Spectroscopy (IDS) is a diagnostic technique that measures plasma ion temperature and velocity without perturbing the plasma with a physical probe. The ZaP-HD Flow Z-Pinch Experiment at the University of Washington uses this technique to resolve radial temperature and velocity profiles of a Z-pinch plasma. The pinch lifetime is ∼100 µs; therefore, diagnostics capable of sub-microsecond resolution are required to measure the evolution of temperature and velocity profiles. The previous IDS diagnostic system was only capable of collecting a single measurement during a plasma pulse. An improved system has been developed to measure the radially resolved ion temperature and velocity for the entire Z-pinch lifetime. A Kirana 05M ultra-fast framing camera and Specialized Imaging lens ultraviolet intensifier are used to record up to 100 spectra per plasma pulse. The temperature is computed from Doppler broadening of the carbon-III (229.687 nm) impurity ion radiation, and the velocity is computed from the Doppler shift of carbon-III. Measurements are able to resolve the evolution of the ion temperature and velocity over the course of a plasma pulse. The diagnostic has significantly reduced the number of pulses required and provides a more coherent measurement of plasma dynamics than the previous system.

Authors:

^[1];

^[1]

Univ. of Washington, Seattle, WA (United States)

Publication Date:: Fri Aug 14 00:00:00 EDT 2020

Research Org.:: Univ. of Washington, Seattle, WA (United States)

Sponsoring Org.:: USDOE Advanced Research Projects Agency - Energy (ARPA-E); USDOE National Nuclear Security Administration (NNSA)

OSTI Identifier:: 1818152

Alternate Identifier(s):: OSTI ID: 1647489

Grant/Contract Number:: AR0000571; NA0001860; FG02-04ER54756; DEFG02-04ER54756; AR-0000571

Resource Type:: Accepted Manuscript

Journal Name:: Review of Scientific Instruments

Additional Journal Information:: Journal Volume: 91; Journal Issue: 8; 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; Plasma confinement; Plasma dynamics; Plasma flows; Optical fibers; Doppler spectroscopy; Differential topology; Telescopes; Doppler effect

Citation Formats


                    Forbes, E. G., and Shumlak, U. Spatio-temporal ion temperature and velocity measurements in a Z pinch using fast-framing spectroscopy.  United States: N. p., 2020. 
Web.  doi:10.1063/5.0012255.

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                    Forbes, E. G., & Shumlak, U. Spatio-temporal ion temperature and velocity measurements in a Z pinch using fast-framing spectroscopy.  United States.  https://doi.org/10.1063/5.0012255

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                    Forbes, E. G., and Shumlak, U. Fri .  
"Spatio-temporal ion temperature and velocity measurements in a Z pinch using fast-framing spectroscopy".  United States.  https://doi.org/10.1063/5.0012255.  https://www.osti.gov/servlets/purl/1818152.

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@article{osti_1818152,

  title        = {Spatio-temporal ion temperature and velocity measurements in a Z pinch using fast-framing spectroscopy},

  author       = {Forbes, E. G. and Shumlak, U.},

  abstractNote = {Ion Doppler Spectroscopy (IDS) is a diagnostic technique that measures plasma ion temperature and velocity without perturbing the plasma with a physical probe. The ZaP-HD Flow Z-Pinch Experiment at the University of Washington uses this technique to resolve radial temperature and velocity profiles of a Z-pinch plasma. The pinch lifetime is ∼100 µs; therefore, diagnostics capable of sub-microsecond resolution are required to measure the evolution of temperature and velocity profiles. The previous IDS diagnostic system was only capable of collecting a single measurement during a plasma pulse. An improved system has been developed to measure the radially resolved ion temperature and velocity for the entire Z-pinch lifetime. A Kirana 05M ultra-fast framing camera and Specialized Imaging lens ultraviolet intensifier are used to record up to 100 spectra per plasma pulse. The temperature is computed from Doppler broadening of the carbon-III (229.687 nm) impurity ion radiation, and the velocity is computed from the Doppler shift of carbon-III. Measurements are able to resolve the evolution of the ion temperature and velocity over the course of a plasma pulse. The diagnostic has significantly reduced the number of pulses required and provides a more coherent measurement of plasma dynamics than the previous system.},

  doi          = {10.1063/5.0012255},

  journal      = {Review of Scientific Instruments},

  number       = 8,

  volume       = 91,

  place        = {United States},

  year         = {Fri Aug 14 00:00:00 EDT 2020},

  month        = {Fri Aug 14 00:00:00 EDT 2020}

}

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Title: Spatio-temporal ion temperature and velocity measurements in a Z pinch using fast-framing spectroscopy

Abstract

Citation Formats

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