Studies of turbulence and transport in Alcator C-Mod H-mode plasmas with phase contrast imaging and comparisons with GYRO
Recent advances in gyrokinetic simulation of core turbulence and associated transport requires an intensified experimental effort to validate these codes using state of the art synthetic diagnostics to compare simulations with experimental data. A phase contrast imaging (PCI) diagnostic [M. Porkolab...
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| Format: | Article |
| Language: | en_US |
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American Institute of Physics
2010
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| Online Access: | http://hdl.handle.net/1721.1/51795 https://orcid.org/0000-0002-9518-4097 https://orcid.org/0000-0002-4438-729X |
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| author | Lin, Liang Porkolab, Miklos Edlund, Eric Matthias Rost, Jon C. Fiore, Catherine L. Greenwald, Martin J. Mikkelsen, David Tsujii, Naoto Wukitch, Stephen James |
| author2 | Massachusetts Institute of Technology. Department of Physics |
| author_facet | Massachusetts Institute of Technology. Department of Physics Lin, Liang Porkolab, Miklos Edlund, Eric Matthias Rost, Jon C. Fiore, Catherine L. Greenwald, Martin J. Mikkelsen, David Tsujii, Naoto Wukitch, Stephen James |
| author_sort | Lin, Liang |
| collection | MIT |
| description | Recent advances in gyrokinetic simulation of core turbulence and associated transport requires an intensified experimental effort to validate these codes using state of the art synthetic diagnostics to compare simulations with experimental data. A phase contrast imaging (PCI) diagnostic [M. Porkolab, J. C. Rost, N. Basse et al., IEEE Trans. Plasma Sci. 34, 229 (2006)] is used to study H-mode plasmas in Alcator C-Mod [M. Greenwald, D. Andelin, N. Basse et al., Nucl. Fusion 45, S109 (2005)]. The PCI system is capable of measuring density fluctuations with high temporal (2 kHz–5 MHz) and wavenumber (0.5–55 cm[superscript −1]) resolution. Recent upgrades have enabled PCI to localize the short wavelength turbulence in the electron temperature gradient range and resolve the direction of propagation (i.e., electron versus ion diamagnetic direction) of the longer wavelength turbulence in the ion temperature gradient (ITG) and trapped electron mode range. The studies focus on plasmas before and during internal transport barrier formation in an enhanced Dalpha H-mode plasma assisted with ion cyclotron resonance frequency heating. Nonlinear GYRO simulations have also been performed [J. Candy and R. E. Waltz, Phys. Rev. Lett. 91, 045001 (2003)] and the predicted fluctuation is compared against experimental measurements through a synthetic PCI diagnostic method. The simulated fluctuations from GYRO agree with experimental measurements in the ITG regime. GYRO also shows good agreement in transport predictions with experimental measurements after reducing the ion temperature gradient (~15%) and adding E×B shear suppression, all within the experimental uncertainty. |
| first_indexed | 2024-09-23T10:55:33Z |
| format | Article |
| id | mit-1721.1/51795 |
| institution | Massachusetts Institute of Technology |
| language | en_US |
| last_indexed | 2024-09-23T10:55:33Z |
| publishDate | 2010 |
| publisher | American Institute of Physics |
| record_format | dspace |
| spelling | mit-1721.1/517952022-09-30T23:57:12Z Studies of turbulence and transport in Alcator C-Mod H-mode plasmas with phase contrast imaging and comparisons with GYRO Lin, Liang Porkolab, Miklos Edlund, Eric Matthias Rost, Jon C. Fiore, Catherine L. Greenwald, Martin J. Mikkelsen, David Tsujii, Naoto Wukitch, Stephen James Massachusetts Institute of Technology. Department of Physics Massachusetts Institute of Technology. Plasma Science and Fusion Center Porkolab, Miklos Lin, Liang Porkolab, Miklos Edlund, Eric Matthias Rost, Jon C. Fiore, Catherine L. Greenwald, Martin J. Mikkelsen, David Tsujii, Naoto Wukitch, Stephen James Recent advances in gyrokinetic simulation of core turbulence and associated transport requires an intensified experimental effort to validate these codes using state of the art synthetic diagnostics to compare simulations with experimental data. A phase contrast imaging (PCI) diagnostic [M. Porkolab, J. C. Rost, N. Basse et al., IEEE Trans. Plasma Sci. 34, 229 (2006)] is used to study H-mode plasmas in Alcator C-Mod [M. Greenwald, D. Andelin, N. Basse et al., Nucl. Fusion 45, S109 (2005)]. The PCI system is capable of measuring density fluctuations with high temporal (2 kHz–5 MHz) and wavenumber (0.5–55 cm[superscript −1]) resolution. Recent upgrades have enabled PCI to localize the short wavelength turbulence in the electron temperature gradient range and resolve the direction of propagation (i.e., electron versus ion diamagnetic direction) of the longer wavelength turbulence in the ion temperature gradient (ITG) and trapped electron mode range. The studies focus on plasmas before and during internal transport barrier formation in an enhanced Dalpha H-mode plasma assisted with ion cyclotron resonance frequency heating. Nonlinear GYRO simulations have also been performed [J. Candy and R. E. Waltz, Phys. Rev. Lett. 91, 045001 (2003)] and the predicted fluctuation is compared against experimental measurements through a synthetic PCI diagnostic method. The simulated fluctuations from GYRO agree with experimental measurements in the ITG regime. GYRO also shows good agreement in transport predictions with experimental measurements after reducing the ion temperature gradient (~15%) and adding E×B shear suppression, all within the experimental uncertainty. U.S. Department of Energy 2010-02-23T20:40:37Z 2010-02-23T20:40:37Z 2009-01 2008-10 Article http://purl.org/eprint/type/JournalArticle 1070-664X http://hdl.handle.net/1721.1/51795 Lin, L. et al. “Studies of turbulence and transport in Alcator C-Mod H-mode plasmas with phase contrast imaging and comparisons with GYRO.” Physics of Plasmas 16.1 (2009): 012502-9. ©2009 American Institute of Physics. https://orcid.org/0000-0002-9518-4097 https://orcid.org/0000-0002-4438-729X en_US http://dx.doi.org/10.1063/1.3057420 Physics of Plasmas Article is made available in accordance with the publisher's policy and may be subject to US copyright law. Please refer to the publisher's site for terms of use. application/pdf American Institute of Physics Carol Arlington |
| spellingShingle | Lin, Liang Porkolab, Miklos Edlund, Eric Matthias Rost, Jon C. Fiore, Catherine L. Greenwald, Martin J. Mikkelsen, David Tsujii, Naoto Wukitch, Stephen James Studies of turbulence and transport in Alcator C-Mod H-mode plasmas with phase contrast imaging and comparisons with GYRO |
| title | Studies of turbulence and transport in Alcator C-Mod H-mode plasmas with phase contrast imaging and comparisons with GYRO |
| title_full | Studies of turbulence and transport in Alcator C-Mod H-mode plasmas with phase contrast imaging and comparisons with GYRO |
| title_fullStr | Studies of turbulence and transport in Alcator C-Mod H-mode plasmas with phase contrast imaging and comparisons with GYRO |
| title_full_unstemmed | Studies of turbulence and transport in Alcator C-Mod H-mode plasmas with phase contrast imaging and comparisons with GYRO |
| title_short | Studies of turbulence and transport in Alcator C-Mod H-mode plasmas with phase contrast imaging and comparisons with GYRO |
| title_sort | studies of turbulence and transport in alcator c mod h mode plasmas with phase contrast imaging and comparisons with gyro |
| url | http://hdl.handle.net/1721.1/51795 https://orcid.org/0000-0002-9518-4097 https://orcid.org/0000-0002-4438-729X |
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