H-mode pedestal characteristics, ELMs, and energy confinement in ITER shape discharges on DIII-D

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The H-mode confinement enhancement factor, H, is found to be strongly correlated with the height of the edge pressure pedestal in ITER shape discharges. In discharges with Type I ELMs the pedestal pressure is set by the maximum pressure gradient before the ELM and the width of the H-mode transport barrier. The pressure gradient before Type I ELMs is found to scale as would be expected for a stability limit set by ideal ballooning modes, but with values significantly in excess of that predicted by stability code calculations. The width of the H-mode transport barrier is found to scale equally ... continued below

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15 p.

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Osborne, T.H.; Groebner, R.J.; Lao, L.L.; Leonard, A.W.; Miller, R.L.; Thomas, D.M. et al. December 1997.

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The H-mode confinement enhancement factor, H, is found to be strongly correlated with the height of the edge pressure pedestal in ITER shape discharges. In discharges with Type I ELMs the pedestal pressure is set by the maximum pressure gradient before the ELM and the width of the H-mode transport barrier. The pressure gradient before Type I ELMs is found to scale as would be expected for a stability limit set by ideal ballooning modes, but with values significantly in excess of that predicted by stability code calculations. The width of the H-mode transport barrier is found to scale equally well with pedestal P(POL)(2/3) or B(POL)(1/2). The improved H value in high B(POL) discharges may be due to a larger edge pressure gradient and wider H-mode transport barrier consistent with their higher edge ballooning mode limit. Deuterium puffing is found to reduce H consistent with the smaller pedestal pressure which results from the reduced barrier width and critical pressure gradient. Type I ELM energy loss is found to be proportional to the change in the pedestal energy.

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15 p.

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INIS; OSTI as DE98001905

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  • US/Japan workshop on H-mode physics and 6th H-mode workshop, Kloster Seeon (Germany), 22-24 Sep 1997

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  • Other: DE98001905
  • Report No.: GA--A22733
  • Report No.: CONF-9709100--
  • Grant Number: AC03-89ER51114;AC05-96OR22464;W-7405-ENG-48
  • Office of Scientific & Technical Information Report Number: 634076
  • Archival Resource Key: ark:/67531/metadc693862

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  • December 1997

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  • Aug. 14, 2015, 8:43 a.m.

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  • Aug. 1, 2016, 6:46 p.m.

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Osborne, T.H.; Groebner, R.J.; Lao, L.L.; Leonard, A.W.; Miller, R.L.; Thomas, D.M. et al. H-mode pedestal characteristics, ELMs, and energy confinement in ITER shape discharges on DIII-D, article, December 1997; San Diego, California. (digital.library.unt.edu/ark:/67531/metadc693862/: accessed August 18, 2017), University of North Texas Libraries, Digital Library, digital.library.unt.edu; crediting UNT Libraries Government Documents Department.