Scaling of ELM and H-mode pedestal characteristics in ITER shape discharges in the DIII-D tokamak

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The authors have shown a correlation between the H-mode pressure pedestal height and the energy confinement enhancement in ITER shape discharges on DIII-D which is consistent with the behavior of H in different ELM classes. The width of the steep gradient region was found to equally well fit the scalings {delta}/R {proportional_to} ({rho}{sub POL}/R){sup 2/3} and {delta}/R {proportional_to} ({beta}{sub POL}{sup PED}/R){sup 1/2}. The normalized pressure gradient {alpha}{sub MHD} was found to be relatively constant just before a type I ELM. An estimate of T{sup PED} for ITER gave 1 to 5 keV. They also estimate {Delta}E{sub ELM} {approx_equal} 26 MJ ... continued below

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7 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. July 1, 1997.

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The authors have shown a correlation between the H-mode pressure pedestal height and the energy confinement enhancement in ITER shape discharges on DIII-D which is consistent with the behavior of H in different ELM classes. The width of the steep gradient region was found to equally well fit the scalings {delta}/R {proportional_to} ({rho}{sub POL}/R){sup 2/3} and {delta}/R {proportional_to} ({beta}{sub POL}{sup PED}/R){sup 1/2}. The normalized pressure gradient {alpha}{sub MHD} was found to be relatively constant just before a type I ELM. An estimate of T{sup PED} for ITER gave 1 to 5 keV. They also estimate {Delta}E{sub ELM} {approx_equal} 26 MJ for ITER. They identified a distinct class of type III ELM at low density which may play a role in setting H at powers near the H-mode threshold power.

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7 p.

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INIS; OSTI as DE97007378

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  • 24. EPS conference on controlled fusion and plasma physics, Berchtesgaden (Germany), 9-13 Jun 1997

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  • Other: DE97007378
  • Report No.: GA-A--22638
  • Report No.: CONF-9706131--1
  • Grant Number: AC03-89ER51114;AC05-96OR22464;W-7405-ENG-48
  • Office of Scientific & Technical Information Report Number: 505410
  • Archival Resource Key: ark:/67531/metadc690967

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  • July 1, 1997

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  • Aug. 14, 2015, 8:43 a.m.

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  • Aug. 1, 2016, 6:40 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. Scaling of ELM and H-mode pedestal characteristics in ITER shape discharges in the DIII-D tokamak, article, July 1, 1997; San Diego, California. (digital.library.unt.edu/ark:/67531/metadc690967/: accessed August 21, 2017), University of North Texas Libraries, Digital Library, digital.library.unt.edu; crediting UNT Libraries Government Documents Department.