PROGRESS IN QUANTIFYING THE EDGE PHYSICS OF H-MODE REGIME IN DIII-D

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Edge conditions in DIII-D are being quantified in order to provide insight into the physics of the H-mode regime. Electron temperature is not the key parameter that controls the L-H transition. Gradients of edge temperature and pressure are much more promising candidates for such parameters. The quality of H-mode confinement is strongly correlated with the height of the H-mode pedestal for the pressure. The gradient of the pressure appears to be controlled by MHD modes, in particular by kink-ballooning modes with finite mode number n. For a wide variety of discharges, the width of the barrier is well described with ... continued below

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8 pages

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GROEBNER, R.J.; BAKER, D.R.; BOEDO, J.A.; BURRELL, K.H.; CARLSTROM, T.N.; DERANIAN, R.D. et al. October 1, 2000.

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Edge conditions in DIII-D are being quantified in order to provide insight into the physics of the H-mode regime. Electron temperature is not the key parameter that controls the L-H transition. Gradients of edge temperature and pressure are much more promising candidates for such parameters. The quality of H-mode confinement is strongly correlated with the height of the H-mode pedestal for the pressure. The gradient of the pressure appears to be controlled by MHD modes, in particular by kink-ballooning modes with finite mode number n. For a wide variety of discharges, the width of the barrier is well described with a relationship that is proportional to ({beta}{sub p}{sup ped}){sup 1/2}. An attractive regime of confinement has been discovered which provides steady-state operation with no ELMs, low impurity content and normal H-mode confinement. A coherent edge MHD-mode evidently provides adequate particle transport to control the plasma density and impurity content while permitting the pressure pedestal to remain almost identical to that observed in ELMing discharges.

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8 pages

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Oakland Operations Office, Oakland, CA (US); INIS

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  • 18th IAEA Fusion Energy Conference, Sorrento (IT), 10/04/2000--10/10/2000; Other Information: THIS IS A PREPRINT OF A PAPER PRESENTED AT THE 18TH IAEA FUSION ENERGY CONFERENCE, OCTOBER 4-10, 2000 IN SORRENTO, ITALY AND TO BE PUBLISHED IN THE PROCEEDINGS

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  • Report No.: NONE
  • Grant Number: AC03-99ER54463
  • Office of Scientific & Technical Information Report Number: 808793
  • Archival Resource Key: ark:/67531/metadc736016

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Reports, articles and other documents harvested from the Office of Scientific and Technical Information.

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  • October 1, 2000

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  • Oct. 18, 2015, 6:40 p.m.

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  • April 19, 2016, 12:49 p.m.

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GROEBNER, R.J.; BAKER, D.R.; BOEDO, J.A.; BURRELL, K.H.; CARLSTROM, T.N.; DERANIAN, R.D. et al. PROGRESS IN QUANTIFYING THE EDGE PHYSICS OF H-MODE REGIME IN DIII-D, article, October 1, 2000; United States. (digital.library.unt.edu/ark:/67531/metadc736016/: accessed December 13, 2017), University of North Texas Libraries, Digital Library, digital.library.unt.edu; crediting UNT Libraries Government Documents Department.