Toroidal Effects on ICRF Heating and Current Drive

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Numerical studies, performed with the Monte-Carlo code FIDO [1], of the evolution of the resonant-ion distribution function in the presence of ICRH in toroidal geometry are presented. In particular it is pointed out how the absorption of toroidal momentum from a wave field with finite parallel wave numbers causes spatial drift and diffusion, which together with the finite orbit widths of the tail ions is shown to have a large effect on the temperature profile of the resonant ion species and also to cause losses of high-energy ions to the wall [2]. Furthermore, it is found that the finite orbit ... continued below

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4 pages

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Carlsson, J.; Hedin, J. & Hellsten, T. April 12, 1999.

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Description

Numerical studies, performed with the Monte-Carlo code FIDO [1], of the evolution of the resonant-ion distribution function in the presence of ICRH in toroidal geometry are presented. In particular it is pointed out how the absorption of toroidal momentum from a wave field with finite parallel wave numbers causes spatial drift and diffusion, which together with the finite orbit widths of the tail ions is shown to have a large effect on the temperature profile of the resonant ion species and also to cause losses of high-energy ions to the wall [2]. Furthermore, it is found that the finite orbit width and the inward drift occuring for negative parallel wave numbers [3] each give rise to a new mechanism of minority-ion cyclotron current drive as compared to earlier models where the drift orbits of the resonant ions are confined to the magnetic flux surfaces. For high levels of coupled power these new mechanisms are found to be the dominating ones [4,5].

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4 pages

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  • 13th Topical Conference on Applications of RF Power to Plasmas, Annapolis, MD, April 12-14, 1999

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  • Other: DE00009351
  • Report No.: ORNL/CP-103732
  • Grant Number: AC05-96OR22464
  • Office of Scientific & Technical Information Report Number: 9351
  • Archival Resource Key: ark:/67531/metadc794110

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  • April 12, 1999

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  • Dec. 19, 2015, 7:14 p.m.

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  • Feb. 15, 2016, 12:30 p.m.

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Carlsson, J.; Hedin, J. & Hellsten, T. Toroidal Effects on ICRF Heating and Current Drive, article, April 12, 1999; Oak Ridge, Tennessee. (digital.library.unt.edu/ark:/67531/metadc794110/: accessed September 23, 2017), University of North Texas Libraries, Digital Library, digital.library.unt.edu; crediting UNT Libraries Government Documents Department.