Scaling of ELM and H-mode pedestal characteristics in ITER shape discharges in the DIII-D tokamak
Conference
·
OSTI ID:505410
- General Atomics, San Diego, CA (United States)
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.
- 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:
- 505410
- Report Number(s):
- GA-A--22638; CONF-9706131--1; ON: DE97007378
- Country of Publication:
- United States
- Language:
- English
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