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Part 1: Document Description
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Citation |
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Title: |
Mean flows and blob velocities in scrape-off layer (SOLT) simulations of an L-mode discharge on Alcator C-Mod |
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Identification Number: |
doi:10.7910/DVN/4UNJMZ |
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Distributor: |
Harvard Dataverse |
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Date of Distribution: |
2018-10-16 |
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Version: |
1 |
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Bibliographic Citation: |
D. A. Russell, J. R. Myra, D. A. D’Ippolito, B. LaBombard, J. W. Hughes, J. L. Terry, S. J. Zweben, 2018, "Mean flows and blob velocities in scrape-off layer (SOLT) simulations of an L-mode discharge on Alcator C-Mod", https://doi.org/10.7910/DVN/4UNJMZ, Harvard Dataverse, V1 |
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Citation |
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Title: |
Mean flows and blob velocities in scrape-off layer (SOLT) simulations of an L-mode discharge on Alcator C-Mod |
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Identification Number: |
doi:10.7910/DVN/4UNJMZ |
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Authoring Entity: |
D. A. Russell, J. R. Myra, D. A. D’Ippolito, B. LaBombard, J. W. Hughes, J. L. Terry, S. J. Zweben |
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Distributor: |
Harvard Dataverse |
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Holdings Information: |
https://doi.org/10.7910/DVN/4UNJMZ |
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Study Scope |
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Keywords: |
Physics, gas puff imaging, Mirror Langmuir Probe, scrapeoff layer, SOLT, structure velocities, turbulence |
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Abstract: |
Two-dimensional scrape-off layer turbulence (SOLT) code simulations are compared with an L-mode discharge on the Alcator C-Mod tokamak [M. Greenwald, et al., Phys. Plasmas 21, 110501 (2014)]. Density and temperature profiles for the simulations were obtained by smoothly fitting Thomson scattering and mirror Langmuir probe (MLP) data from the shot. Simulations differing in turbulence intensity were obtained by varying a dissipation parameter. Mean flow profiles and density fluctuation amplitudes are consistent with those measured by MLP in the experiment and with a Fourier space diagnostic designed to measure poloidal phase velocity. Blob velocities in the simulations were determined from the correlation function for density fluctuations, as in the analysis of gas-puff-imaging (GPI) blobs in the experiment. In the simulations, it was found that larger blobs moved poloidally with the ExB flow velocity, vE , in the near-SOL, while smaller fluctuations moved with the group velocity of the dominant linear (interchange) mode, vE + 1/2 vdi, where vdi is the ion diamagnetic drift velocity. Comparisons are made with the measured GPI correlation velocity for the discharge. The saturation mechanisms operative in the simulation of the discharge are also discussed. It is found that neither sheared flow nor pressure gradient modification can be excluded as saturation mechanisms. |
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Notes: |
<a href="http://library.psfc.mit.edu/catalog/reports/2010/16ja/16ja076/abstract.php">PSFC REPORT PSFC/JA-16-76</a><br /><br />This work was supported in part by DoE Contract DE-FC02-99ER54512 on Alcator C-Mod, a DoE Office of Science user facility. |
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Methodology and Processing |
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Sources Statement |
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Data Access |
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Notes: |
This dataset is made available without information on how it can be used. You should communicate with the Contact(s) specified before use. |
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Other Study Description Materials |
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