Structure, Stability and ELM Dynamics of the H-Mode Pedestal in DIII-D

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Experiments are described that have increased understanding of the transport and stability physics that set the H-mode edge pedestal width and height, determine the onset of Type-I edge localized modes (ELMs), and produce the nonlinear dynamics of the ELM perturbation in the pedestal and scrape-off layer (SOL). Predictive models now exist for the n{sub e} pedestal profile and the p{sub e} height at the onset of Type-I ELMs, and progress has been made toward predictive models of the T{sub e} pedestal width and nonlinear ELM evolution. Similarity experiments between DIII-D and JET suggested that neutral penetration physics dominates in the ... continued below

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Fenstermacher, M E; Leonard, A W; Osborne, T H; Snyder, P B; Thomas, D M; Boedo, J A et al. October 13, 2004.

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Experiments are described that have increased understanding of the transport and stability physics that set the H-mode edge pedestal width and height, determine the onset of Type-I edge localized modes (ELMs), and produce the nonlinear dynamics of the ELM perturbation in the pedestal and scrape-off layer (SOL). Predictive models now exist for the n{sub e} pedestal profile and the p{sub e} height at the onset of Type-I ELMs, and progress has been made toward predictive models of the T{sub e} pedestal width and nonlinear ELM evolution. Similarity experiments between DIII-D and JET suggested that neutral penetration physics dominates in the relationship between the width and height of the n{sub e} pedestal while plasma physics dominates in setting the T{sub e} pedestal width. Measured pedestal conditions including edge current at ELM onset agree with intermediate-n peeling-ballooning (P-B) stability predictions. Midplane ELM dynamics data show the predicted (P-B) structure at ELM onset, large rapid variations of the SOL parameters, and fast radial propagation in later phases, similar to features in nonlinear ELM simulations.

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PDF-FILE: 14 ; SIZE: 2.2 MBYTES pages

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  • Presented at: 20th IAEA Fusion Energy Conference, Vilamoura (PT), 11/01/2004--11/06/2004

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  • Report No.: UCRL-CONF-207227
  • Grant Number: W-7405-ENG-48
  • Office of Scientific & Technical Information Report Number: 15011398
  • Archival Resource Key: ark:/67531/metadc1408053

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  • October 13, 2004

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  • Jan. 23, 2019, 12:54 p.m.

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  • Feb. 8, 2019, 6:41 p.m.

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Fenstermacher, M E; Leonard, A W; Osborne, T H; Snyder, P B; Thomas, D M; Boedo, J A et al. Structure, Stability and ELM Dynamics of the H-Mode Pedestal in DIII-D, article, October 13, 2004; Livermore, California. (https://digital.library.unt.edu/ark:/67531/metadc1408053/: accessed March 23, 2019), University of North Texas Libraries, Digital Library, https://digital.library.unt.edu; crediting UNT Libraries Government Documents Department.