Feasibility study for a high-k temperature fluctuation diagnostic based on soft x-ray imaging

X. Chen; J. Ruiz Ruiz; N. T. Howard; W. Guttenfelder; J. Candy; J. W. Hughes; R. S. Granetz; A. E. White

doi:10.1063/5.0043819

Feasibility study for a high-k temperature fluctuation diagnostic based on soft x-ray imaging

X. Chen, J. Ruiz Ruiz, N. T. Howard, W. Guttenfelder, J. Candy, J. W. Hughes, R. S. Granetz, A. E. White

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Abstract

A new pseudolocal tomography algorithm is developed for soft X-ray(SXR) imaging measurements of the turbulent electron temperature fluctuations (d T_e) in tokamaks and stellarators. The algorithm overcomes the constraints of limited viewing ports on the vessel wall (viewing angle) and limited number of lines of sight (LOS). This is accomplished by increasing the number of LOS locally in a region of interest. Numerical modeling demonstrates that the wavenumber spectrum of the turbulence can be reliably reconstructed, with an acceptable number of viewing angles and LOS and suitable low SNR detectors. We conclude that a SXR imaging diagnostic for measurements of turbulent d T_e using a pseudolocal reconstruction algorithm is feasible.

Original language	English (US)
Article number	053537
Journal	Review of Scientific Instruments
Volume	92
Issue number	5
DOIs	https://doi.org/10.1063/5.0043819
State	Published - May 1 2021

All Science Journal Classification (ASJC) codes

Instrumentation

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10.1063/5.0043819

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title = "Feasibility study for a high-k temperature fluctuation diagnostic based on soft x-ray imaging",

abstract = "A new pseudolocal tomography algorithm is developed for soft X-ray(SXR) imaging measurements of the turbulent electron temperature fluctuations (d Te) in tokamaks and stellarators. The algorithm overcomes the constraints of limited viewing ports on the vessel wall (viewing angle) and limited number of lines of sight (LOS). This is accomplished by increasing the number of LOS locally in a region of interest. Numerical modeling demonstrates that the wavenumber spectrum of the turbulence can be reliably reconstructed, with an acceptable number of viewing angles and LOS and suitable low SNR detectors. We conclude that a SXR imaging diagnostic for measurements of turbulent d Te using a pseudolocal reconstruction algorithm is feasible.",

author = "X. Chen and Ruiz, \{J. Ruiz\} and Howard, \{N. T.\} and W. Guttenfelder and J. Candy and Hughes, \{J. W.\} and Granetz, \{R. S.\} and White, \{A. E.\}",

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doi = "10.1063/5.0043819",

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T1 - Feasibility study for a high-k temperature fluctuation diagnostic based on soft x-ray imaging

AU - Chen, X.

AU - Ruiz, J. Ruiz

AU - Howard, N. T.

AU - Guttenfelder, W.

AU - Candy, J.

AU - Hughes, J. W.

AU - Granetz, R. S.

AU - White, A. E.

PY - 2021/5/1

Y1 - 2021/5/1

N2 - A new pseudolocal tomography algorithm is developed for soft X-ray(SXR) imaging measurements of the turbulent electron temperature fluctuations (d Te) in tokamaks and stellarators. The algorithm overcomes the constraints of limited viewing ports on the vessel wall (viewing angle) and limited number of lines of sight (LOS). This is accomplished by increasing the number of LOS locally in a region of interest. Numerical modeling demonstrates that the wavenumber spectrum of the turbulence can be reliably reconstructed, with an acceptable number of viewing angles and LOS and suitable low SNR detectors. We conclude that a SXR imaging diagnostic for measurements of turbulent d Te using a pseudolocal reconstruction algorithm is feasible.

AB - A new pseudolocal tomography algorithm is developed for soft X-ray(SXR) imaging measurements of the turbulent electron temperature fluctuations (d Te) in tokamaks and stellarators. The algorithm overcomes the constraints of limited viewing ports on the vessel wall (viewing angle) and limited number of lines of sight (LOS). This is accomplished by increasing the number of LOS locally in a region of interest. Numerical modeling demonstrates that the wavenumber spectrum of the turbulence can be reliably reconstructed, with an acceptable number of viewing angles and LOS and suitable low SNR detectors. We conclude that a SXR imaging diagnostic for measurements of turbulent d Te using a pseudolocal reconstruction algorithm is feasible.

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Feasibility study for a high-k temperature fluctuation diagnostic based on soft x-ray imaging

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