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

Conference ·
OSTI ID:634076
; ; ; ; ; ;  [1];  [2];  [3]
  1. General Atomics, San Diego, CA (United States)
  2. Oak Ridge National Lab., TN (United States)
  3. Lawrence Livermore National Lab., CA (United States)
+ Show Author Affiliations
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.
Research Organization:
General Atomics, San Diego, CA (United States); Oak Ridge National Lab., TN (United States); Lawrence Livermore National Lab., CA (United States)]
Sponsoring Organization:
USDOE Office of Energy Research, Washington, DC (United States)
DOE Contract Number:
AC03-89ER51114; AC05-96OR22464; W-7405-ENG-48
OSTI ID:
634076
Report Number(s):
GA--A22733; CONF-9709100--; ON: DE98001905
Country of Publication:
United States
Language:
English

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Related Subjects

70 PLASMA PHYSICS AND FUSION TECHNOLOGY
BALLOONING INSTABILITY
CORRELATIONS
DOUBLET-3 DEVICE
EDGE LOCALIZED MODES
ENERGY LOSSES
H-MODE PLASMA CONFINEMENT
PLASMA PRESSURE