Neutral Transport Simulations of Gas Puff Imaging Experiments on Alcator C-Mod

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Visible imaging of gas puffs has been used on the Alcator C-Mod tokamak to characterize edge plasma turbulence, yielding data that can be compared with plasma turbulence codes. Simulations of these experiments with the DEGAS 2 Monte Carlo neutral transport code have been carried out to explore the relationship between the plasma fluctuations and the observed light emission. By imposing two-dimensional modulations on the measured time-average plasma density and temperature profiles, we demonstrate that the spatial structure of the emission cloud reflects that of the underlying turbulence. However, the photon emission rate depends on the plasma density and temperature in ... continued below

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458 Kilobytes pages

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Stotler, D.P.; LaBombard, B.; Terry, J.L. & Zweben, S.J. June 12, 2002.

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Visible imaging of gas puffs has been used on the Alcator C-Mod tokamak to characterize edge plasma turbulence, yielding data that can be compared with plasma turbulence codes. Simulations of these experiments with the DEGAS 2 Monte Carlo neutral transport code have been carried out to explore the relationship between the plasma fluctuations and the observed light emission. By imposing two-dimensional modulations on the measured time-average plasma density and temperature profiles, we demonstrate that the spatial structure of the emission cloud reflects that of the underlying turbulence. However, the photon emission rate depends on the plasma density and temperature in a complicated way, and no simple scheme for inferring the plasma parameters directly from the light emission patterns is apparent. The simulations indicate that excited atoms generated by molecular dissociation are a significant source of photons, further complicating interpretation of the gas puff imaging results.Visibl e imaging of gas puffs has been used on the Alcator C-Mod tokamak to characterize edge plasma turbulence, yielding data that can be compared with plasma turbulence codes. Simulations of these experiments with the DEGAS 2 Monte Carlo neutral transport code have been carried out to explore the relationship between the plasma fluctuations and the observed light emission. By imposing two-dimensional modulations on the measured time-average plasma density and temperature profiles, we demonstrate that the spatial structure of the emission cloud reflects that of the underlying turbulence. However, the photon emission rate depends on the plasma density and temperature in a complicated way, and no simple scheme for inferring the plasma parameters directly from the light emission patterns is apparent. The simulations indicate that excited atoms generated by molecular dissociation are a significant source of photons, further complicating interpretation of the gas puff imaging results.

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458 Kilobytes pages

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INIS; OSTI as DE00798193

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  • Other Information: PBD: 12 Jun 2002

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  • Report No.: PPPL-3705.pdf
  • Grant Number: AC02-76CH03073
  • DOI: 10.2172/798193 | External Link
  • Office of Scientific & Technical Information Report Number: 798193
  • Archival Resource Key: ark:/67531/metadc735723

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  • June 12, 2002

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  • Oct. 19, 2015, 7:39 p.m.

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  • April 15, 2016, 9:46 p.m.

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Stotler, D.P.; LaBombard, B.; Terry, J.L. & Zweben, S.J. Neutral Transport Simulations of Gas Puff Imaging Experiments on Alcator C-Mod, report, June 12, 2002; Princeton, New Jersey. (digital.library.unt.edu/ark:/67531/metadc735723/: accessed November 17, 2017), University of North Texas Libraries, Digital Library, digital.library.unt.edu; crediting UNT Libraries Government Documents Department.