Enhancement of the Bootstrap Current in a Tokamak Pedestal
The strong radial electric field in a subsonic tokamak pedestal modifies the neoclassical ion parallel flow velocity, as well as the radial ion heat flux. Existing experimental evidence of the resulting alteration in the poloidal flow of a trace impurity is discussed. We then demonstrate that the mo...
| Main Authors: | , |
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| Other Authors: | |
| Format: | Article |
| Language: | en_US |
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American Physical Society
2011
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| Online Access: | http://hdl.handle.net/1721.1/60900 https://orcid.org/0000-0002-0349-1736 |
| _version_ | 1826198578437029888 |
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| author | Catto, Peter J. Kagan, Grigory Alexandrovich |
| author2 | Massachusetts Institute of Technology. Plasma Science and Fusion Center |
| author_facet | Massachusetts Institute of Technology. Plasma Science and Fusion Center Catto, Peter J. Kagan, Grigory Alexandrovich |
| author_sort | Catto, Peter J. |
| collection | MIT |
| description | The strong radial electric field in a subsonic tokamak pedestal modifies the neoclassical ion parallel flow velocity, as well as the radial ion heat flux. Existing experimental evidence of the resulting alteration in the poloidal flow of a trace impurity is discussed. We then demonstrate that the modified parallel ion flow can noticeably enhance the pedestal bootstrap current when the background ions are in the banana regime. Only the coefficient of the ion temperature gradient drive term is affected. The revised expression for the pedestal bootstrap current is presented. The prescription for inserting the modification into any existing banana regime bootstrap current expression is given. |
| first_indexed | 2024-09-23T11:07:04Z |
| format | Article |
| id | mit-1721.1/60900 |
| institution | Massachusetts Institute of Technology |
| language | en_US |
| last_indexed | 2024-09-23T11:07:04Z |
| publishDate | 2011 |
| publisher | American Physical Society |
| record_format | dspace |
| spelling | mit-1721.1/609002022-09-27T17:15:11Z Enhancement of the Bootstrap Current in a Tokamak Pedestal Catto, Peter J. Kagan, Grigory Alexandrovich Massachusetts Institute of Technology. Plasma Science and Fusion Center Catto, Peter J. Catto, Peter J. Kagan, Grigory Alexandrovich The strong radial electric field in a subsonic tokamak pedestal modifies the neoclassical ion parallel flow velocity, as well as the radial ion heat flux. Existing experimental evidence of the resulting alteration in the poloidal flow of a trace impurity is discussed. We then demonstrate that the modified parallel ion flow can noticeably enhance the pedestal bootstrap current when the background ions are in the banana regime. Only the coefficient of the ion temperature gradient drive term is affected. The revised expression for the pedestal bootstrap current is presented. The prescription for inserting the modification into any existing banana regime bootstrap current expression is given. United States. Dept. of Energy (Grant No. DE-FG02- 91ER54109) 2011-02-04T16:22:42Z 2011-02-04T16:22:42Z 2010-07 2010-01 Article http://purl.org/eprint/type/JournalArticle 0031-9007 http://hdl.handle.net/1721.1/60900 Kagan, Grigory, and Peter J. Catto. “Enhancement of the Bootstrap Current in a Tokamak Pedestal.” Physical Review Letters 105.4 (2010): 045002. © 2010 The American Physical Society. https://orcid.org/0000-0002-0349-1736 en_US http://dx.doi.org/10.1103/PhysRevLett.105.045002 Physical Review Letters 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 Physical Society APS |
| spellingShingle | Catto, Peter J. Kagan, Grigory Alexandrovich Enhancement of the Bootstrap Current in a Tokamak Pedestal |
| title | Enhancement of the Bootstrap Current in a Tokamak Pedestal |
| title_full | Enhancement of the Bootstrap Current in a Tokamak Pedestal |
| title_fullStr | Enhancement of the Bootstrap Current in a Tokamak Pedestal |
| title_full_unstemmed | Enhancement of the Bootstrap Current in a Tokamak Pedestal |
| title_short | Enhancement of the Bootstrap Current in a Tokamak Pedestal |
| title_sort | enhancement of the bootstrap current in a tokamak pedestal |
| url | http://hdl.handle.net/1721.1/60900 https://orcid.org/0000-0002-0349-1736 |
| work_keys_str_mv | AT cattopeterj enhancementofthebootstrapcurrentinatokamakpedestal AT kagangrigoryalexandrovich enhancementofthebootstrapcurrentinatokamakpedestal |