Transport and turbulence studies in the linear ohmic confinement regime in Alcator C-Mod
Transport in ohmically heated plasmas in Alcator C-Mod was studied in both the linear (LOC) and saturated (SOC) ohmic L-mode confinement regimes and the importance of turbulent transport in the region r/a = 0.5–0.8 was established. After an extensive analysis with TGLF and GYRO, it is found that usi...
| Main Authors: | , , , , , , , , , , , , , , , , |
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| Format: | Article |
| Language: | en_US |
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IOP Publishing
2013
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| Online Access: | http://hdl.handle.net/1721.1/80870 https://orcid.org/0000-0003-3234-8733 https://orcid.org/0000-0001-8319-5971 https://orcid.org/0000-0002-9518-4097 https://orcid.org/0000-0002-4438-729X https://orcid.org/0000-0002-5283-0546 |
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| author | Candy, J. Staebler, G. M. Waltz, R. E. Porkolab, Miklos Ennever, Paul Chappell Fiore, Catherine L. Greenwald, Martin J. Hubbard, Amanda E. Dorris, James R. Ma, Y. Marmar, Earl S. Podpaly, Y. Reinke, Matthew Logan Rice, John E. Rost, Jon C. Tsujii, Naoto Ernst, Darin R. |
| author2 | Massachusetts Institute of Technology. Department of Physics |
| author_facet | Massachusetts Institute of Technology. Department of Physics Candy, J. Staebler, G. M. Waltz, R. E. Porkolab, Miklos Ennever, Paul Chappell Fiore, Catherine L. Greenwald, Martin J. Hubbard, Amanda E. Dorris, James R. Ma, Y. Marmar, Earl S. Podpaly, Y. Reinke, Matthew Logan Rice, John E. Rost, Jon C. Tsujii, Naoto Ernst, Darin R. |
| author_sort | Candy, J. |
| collection | MIT |
| description | Transport in ohmically heated plasmas in Alcator C-Mod was studied in both the linear (LOC) and saturated (SOC) ohmic L-mode confinement regimes and the importance of turbulent transport in the region r/a = 0.5–0.8 was established. After an extensive analysis with TGLF and GYRO, it is found that using an effective impurity ion species with Z[subscript i] = 8, and moderately high Z[subscript eff] (2.0–5.6), in the LOC regime electron transport becomes dominant due to TEM turbulence. The key ingredient in the present results is the observation that dilution of the main ion species (deuterium) by impurity species of moderate charge state reduces dominant ITG turbulence, in contrast to the SOC regime with little, if any dilution. The turbulent spectrum measured with the phase contrast imaging (PCI) diagnostic is in qualitative agreement with predictions of a synthetic PCI diagnostic adopted to Global GYRO. The toroidal rotation in the low-density LOC regime is in the co-current direction but as the density is raised in the SOC regime the rotation reverses to the counter current drive direction. The impurity content of the plasma was measured recently and an effective Z[subscript i] of 9 was deduced. |
| first_indexed | 2024-09-23T16:48:57Z |
| format | Article |
| id | mit-1721.1/80870 |
| institution | Massachusetts Institute of Technology |
| language | en_US |
| last_indexed | 2024-09-23T16:48:57Z |
| publishDate | 2013 |
| publisher | IOP Publishing |
| record_format | dspace |
| spelling | mit-1721.1/808702022-10-03T08:30:29Z Transport and turbulence studies in the linear ohmic confinement regime in Alcator C-Mod Candy, J. Staebler, G. M. Waltz, R. E. Porkolab, Miklos Ennever, Paul Chappell Fiore, Catherine L. Greenwald, Martin J. Hubbard, Amanda E. Dorris, James R. Ma, Y. Marmar, Earl S. Podpaly, Y. Reinke, Matthew Logan Rice, John E. Rost, Jon C. Tsujii, Naoto Ernst, Darin R. Massachusetts Institute of Technology. Department of Physics Massachusetts Institute of Technology. Plasma Science and Fusion Center Porkolab, Miklos Porkolab, Miklos Ennever, Paul Chappell Fiore, Catherine L. Greenwald, Martin J. Hubbard, Amanda E. Dorris, James R. Ma, Y. Marmar, Earl S. Podpaly, Y. Reinke, Matthew Logan Rice, John E. Rost, Jon C. Tsujii, Naoto Ernst, Darin R. Transport in ohmically heated plasmas in Alcator C-Mod was studied in both the linear (LOC) and saturated (SOC) ohmic L-mode confinement regimes and the importance of turbulent transport in the region r/a = 0.5–0.8 was established. After an extensive analysis with TGLF and GYRO, it is found that using an effective impurity ion species with Z[subscript i] = 8, and moderately high Z[subscript eff] (2.0–5.6), in the LOC regime electron transport becomes dominant due to TEM turbulence. The key ingredient in the present results is the observation that dilution of the main ion species (deuterium) by impurity species of moderate charge state reduces dominant ITG turbulence, in contrast to the SOC regime with little, if any dilution. The turbulent spectrum measured with the phase contrast imaging (PCI) diagnostic is in qualitative agreement with predictions of a synthetic PCI diagnostic adopted to Global GYRO. The toroidal rotation in the low-density LOC regime is in the co-current direction but as the density is raised in the SOC regime the rotation reverses to the counter current drive direction. The impurity content of the plasma was measured recently and an effective Z[subscript i] of 9 was deduced. United States. Dept. of Energy (Grant DE-FC02-99ER54512-CMOD) 2013-09-23T16:49:36Z 2013-09-23T16:49:36Z 2012-11 2012-08 Article http://purl.org/eprint/type/JournalArticle 0741-3335 1361-6587 http://hdl.handle.net/1721.1/80870 Porkolab, M, J Dorris, P Ennever, C Fiore, M Greenwald, A Hubbard, Y Ma, et al. “Transport and turbulence studies in the linear ohmic confinement regime in Alcator C-Mod.” Plasma Physics and Controlled Fusion 54, no. 12 (December 1, 2012): 124029. https://orcid.org/0000-0003-3234-8733 https://orcid.org/0000-0001-8319-5971 https://orcid.org/0000-0002-9518-4097 https://orcid.org/0000-0002-4438-729X https://orcid.org/0000-0002-5283-0546 en_US http://dx.doi.org/10.1088/0741-3335/54/12/124029 Plasma Physics and Controlled Fusion Creative Commons Attribution-Noncommercial-Share Alike 3.0 http://creativecommons.org/licenses/by-nc-sa/3.0/ application/pdf IOP Publishing Prof. Porkolab via Chris Sherratt |
| spellingShingle | Candy, J. Staebler, G. M. Waltz, R. E. Porkolab, Miklos Ennever, Paul Chappell Fiore, Catherine L. Greenwald, Martin J. Hubbard, Amanda E. Dorris, James R. Ma, Y. Marmar, Earl S. Podpaly, Y. Reinke, Matthew Logan Rice, John E. Rost, Jon C. Tsujii, Naoto Ernst, Darin R. Transport and turbulence studies in the linear ohmic confinement regime in Alcator C-Mod |
| title | Transport and turbulence studies in the linear ohmic confinement regime in Alcator C-Mod |
| title_full | Transport and turbulence studies in the linear ohmic confinement regime in Alcator C-Mod |
| title_fullStr | Transport and turbulence studies in the linear ohmic confinement regime in Alcator C-Mod |
| title_full_unstemmed | Transport and turbulence studies in the linear ohmic confinement regime in Alcator C-Mod |
| title_short | Transport and turbulence studies in the linear ohmic confinement regime in Alcator C-Mod |
| title_sort | transport and turbulence studies in the linear ohmic confinement regime in alcator c mod |
| url | http://hdl.handle.net/1721.1/80870 https://orcid.org/0000-0003-3234-8733 https://orcid.org/0000-0001-8319-5971 https://orcid.org/0000-0002-9518-4097 https://orcid.org/0000-0002-4438-729X https://orcid.org/0000-0002-5283-0546 |
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