Empirical Study of Ne in H-Mode Pedestal in DIII-D

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There is compelling empirical [1] and theoretical [2] evidence that the global confinement of H-mode discharges increases as the pedestal pressure or temperature increases. Therefore, confidence in the performance of future machines requires an ability to predict the pedestal conditions in those machines. At this time, both the theoretical and empirical understanding of transport in the pedestal are incomplete and are inadequate to predict pedestal conditions in present or future machines. Recent empirical results might be evidence of a fundamental relation between the electron temperature T{sub e} and electron density n{sub e} profiles in the pedestal. A data set from ... continued below

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. Groebner, R J; Osborne, T H; Fenstermacher, M E; Leonard, A W; Mahdavi, M A; Snyder, P B et al. May 5, 2005.

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There is compelling empirical [1] and theoretical [2] evidence that the global confinement of H-mode discharges increases as the pedestal pressure or temperature increases. Therefore, confidence in the performance of future machines requires an ability to predict the pedestal conditions in those machines. At this time, both the theoretical and empirical understanding of transport in the pedestal are incomplete and are inadequate to predict pedestal conditions in present or future machines. Recent empirical results might be evidence of a fundamental relation between the electron temperature T{sub e} and electron density n{sub e} profiles in the pedestal. A data set from the ASDEX-Upgrade tokamak has shown that {eta}{sub e}, the ratio between the scale lengths of the n{sub e} and T{sub e} profiles, exhibits a value of about 2 throughout the pedestal, despite a large range of the actual density and temperature values [3]. Data from the DIII-D tokamak show that over a wide range of pedestal density, the width of the steep gradient region for the T{sub e} profile is about 1-2 times the corresponding width for the n{sub e} profile, where both widths are measured from the plasma edge [4]. Thus, the barrier in the density might form a lower limit for the barrier in the electron temperature.

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PDF-FILE: 9 ; SIZE: 0.1 MBYTES pages

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  • Presented at: 31st EPS Conference on Plasma Physics, London (GB), 06/28/2004--07/02/2004

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  • Report No.: UCRL-PROC-212134
  • Grant Number: W-7405-ENG-48
  • Office of Scientific & Technical Information Report Number: 15016343
  • Archival Resource Key: ark:/67531/metadc1412372

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  • May 5, 2005

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  • Jan. 23, 2019, 12:54 p.m.

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  • Feb. 8, 2019, 4:08 p.m.

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. Groebner, R J; Osborne, T H; Fenstermacher, M E; Leonard, A W; Mahdavi, M A; Snyder, P B et al. Empirical Study of Ne in H-Mode Pedestal in DIII-D, article, May 5, 2005; Livermore, California. (https://digital.library.unt.edu/ark:/67531/metadc1412372/: accessed March 23, 2019), University of North Texas Libraries, Digital Library, https://digital.library.unt.edu; crediting UNT Libraries Government Documents Department.