Examination of synthetic gas puff imaging diagnostic data from a gyrokinetic turbulence code
Abstract
A synthetic gas puff imaging (GPI) diagnostic has been developed for the purpose of validating the three-dimensional gyrokinetic turbulence code XGC. The synthetic diagnostic is described and applied to XGC simulations of two Alcator C-Mod discharges. The turbulence characteristics deduced from the resulting simulated GPI frames, using analysis techniques similar to those applied to experimental data, are compared with locally derived characteristics extracted directly from the XGC output. The comparison of the two is shown to be potentially impacted by misalignment between the GPI view and the magnetic field, the dependence of the light emission on the electron density and temperature, and spatial and temporal variations in the neutral gas cloud induced by the turbulent plasma fluctuations. We conclude that quantitative and, in some cases even qualitative, validation of turbulence simulations need to account for these effects. While we cannot directly compare our results with experimental data due to the absence of high quality GPI data from the shots and times simulated by XGC, we do relate the overall characteristics obtained from the synthetic GPI analysis to published Alcator C-Mod GPI data.
- Authors:
-
[1];
[1];
[1];
[1];
[1];
[2]
- Princeton Plasma Physics Lab. (PPPL), Princeton, NJ (United States)
- Massachusetts Inst. of Technology (MIT), Cambridge, MA (United States)
- Publication Date:
- Research Org.:
- Princeton Plasma Physics Laboratory (PPPL), Princeton, NJ (United States)
- Sponsoring Org.:
- USDOE
- OSTI Identifier:
- 1642914
- Alternate Identifier(s):
- OSTI ID: 1633938
- Grant/Contract Number:
- AC02-09CH11466; FC02-99ER54512; AC02-05CH11231
- Resource Type:
- Accepted Manuscript
- Journal Name:
- Physics of Plasmas
- Additional Journal Information:
- Journal Volume: 27; Journal Issue: 6; Journal ID: ISSN 1070-664X
- Publisher:
- American Institute of Physics (AIP)
- Country of Publication:
- United States
- Language:
- English
- Subject:
- 70 PLASMA PHYSICS AND FUSION TECHNOLOGY; Autocorrelation; Monte Carlo methods; Turbulence simulations; Plasma diagnostics; Tokamaks; Plasma fluctuations
Citation Formats
Stotler, D. P., Ku, S., Zweben, S. J., Chang, C. S., Churchill, R. M., and Terry, J. L.. Examination of synthetic gas puff imaging diagnostic data from a gyrokinetic turbulence code. United States: N. p., 2020.
Web. doi:10.1063/5.0002876.
Stotler, D. P., Ku, S., Zweben, S. J., Chang, C. S., Churchill, R. M., & Terry, J. L.. Examination of synthetic gas puff imaging diagnostic data from a gyrokinetic turbulence code. United States. https://doi.org/10.1063/5.0002876
Stotler, D. P., Ku, S., Zweben, S. J., Chang, C. S., Churchill, R. M., and Terry, J. L.. Mon .
"Examination of synthetic gas puff imaging diagnostic data from a gyrokinetic turbulence code". United States. https://doi.org/10.1063/5.0002876. https://www.osti.gov/servlets/purl/1642914.
@article{osti_1642914,
title = {Examination of synthetic gas puff imaging diagnostic data from a gyrokinetic turbulence code},
author = {Stotler, D. P. and Ku, S. and Zweben, S. J. and Chang, C. S. and Churchill, R. M. and Terry, J. L.},
abstractNote = {A synthetic gas puff imaging (GPI) diagnostic has been developed for the purpose of validating the three-dimensional gyrokinetic turbulence code XGC. The synthetic diagnostic is described and applied to XGC simulations of two Alcator C-Mod discharges. The turbulence characteristics deduced from the resulting simulated GPI frames, using analysis techniques similar to those applied to experimental data, are compared with locally derived characteristics extracted directly from the XGC output. The comparison of the two is shown to be potentially impacted by misalignment between the GPI view and the magnetic field, the dependence of the light emission on the electron density and temperature, and spatial and temporal variations in the neutral gas cloud induced by the turbulent plasma fluctuations. We conclude that quantitative and, in some cases even qualitative, validation of turbulence simulations need to account for these effects. While we cannot directly compare our results with experimental data due to the absence of high quality GPI data from the shots and times simulated by XGC, we do relate the overall characteristics obtained from the synthetic GPI analysis to published Alcator C-Mod GPI data.},
doi = {10.1063/5.0002876},
journal = {Physics of Plasmas},
number = 6,
volume = 27,
place = {United States},
year = {2020},
month = {6}
}
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