Simulation of edge-plasma profiles and turbulence related to L-H transitions in tokamaks

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Understanding plasma profile evolution and plasma turbulence are two important aspects of developing a predictive model for edge-plasma in tokamaks and other fusion-related devices. Here they describe results relevant to the L-H transition phenomena observed in tokamaks obtained from two simulations codes which emphasize the two aspects of the problem. UEDGE solves for the two-dimensional (2-D) profiles of a multi-species plasma and neutrals given some anomalous cross-field diffusion coefficients, and BOUT solves for the three-dimensional (3-D) turbulence that gives rise to the anomalous diffusion. These two codes are thus complementary in solving different aspects of the edge-plasma transport problem; ultimately, ... continued below

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936 Kilobytes pages

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Cohen, R H; Rognlien, T D & Xu, X Q September 21, 1999.

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Understanding plasma profile evolution and plasma turbulence are two important aspects of developing a predictive model for edge-plasma in tokamaks and other fusion-related devices. Here they describe results relevant to the L-H transition phenomena observed in tokamaks obtained from two simulations codes which emphasize the two aspects of the problem. UEDGE solves for the two-dimensional (2-D) profiles of a multi-species plasma and neutrals given some anomalous cross-field diffusion coefficients, and BOUT solves for the three-dimensional (3-D) turbulence that gives rise to the anomalous diffusion. These two codes are thus complementary in solving different aspects of the edge-plasma transport problem; ultimately, they want to couple the codes so that UEDGE uses BOUT's turbulence transport results, and BOUT uses UEDGE's plasma profiles with a fully automated iteration procedure. This goal is beyond the present paper; here they show how each aspect of the problem, i.e., profiles and turbulent transport, can contribute to L-H type transitions.

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936 Kilobytes pages

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  • IAEA Technical Committee Meeting/H-Mode Physics, Oxford (GB), 09/27/1999--09/29/1999

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  • Report No.: UCRL-JC-135746
  • Report No.: AT5020100
  • Grant Number: W-7405-ENG-48
  • Office of Scientific & Technical Information Report Number: 14589
  • Archival Resource Key: ark:/67531/metadc626129

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  • September 21, 1999

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  • June 16, 2015, 7:43 a.m.

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  • May 6, 2016, 2:01 p.m.

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Cohen, R H; Rognlien, T D & Xu, X Q. Simulation of edge-plasma profiles and turbulence related to L-H transitions in tokamaks, article, September 21, 1999; California. (digital.library.unt.edu/ark:/67531/metadc626129/: accessed November 23, 2017), University of North Texas Libraries, Digital Library, digital.library.unt.edu; crediting UNT Libraries Government Documents Department.