by L. L. Lao,Y. Kamada,T. Oikawa,Larry R Baylor,K. H. Burrell,V. S. Chan,M. Chance,M. S. Chu,J. R. Ferron,T. Fukuda,T. Hatae,A. Isayama,G. J. Jackson,A. W. Leonard,M. A. Makowski,J. Manickam,M. Okabayashi,T. H. Osborne,P. B. Snyder,E. J. Strait,S. Takeji,T. Takizuka,T. S. Taylor,A. D. Turnbull,K. Tsuchiya,Mickey R Wade
Publication Type
Conference Paper
Book Title
CD: IAEA 18TH Conference Proceedings
Publication Date
Page Numbers
151 to 300
Volume
41
Issue
3
Conference Name
18th IAEA Fusion Energy Conference
Conference Location
Sorrento, Italy
Conference Sponsor
International Atomic Energy Agency (IAEA)
Conference Date
-
Abstract
The dependence of edge stability on plasma shape and local pressure gradients, P, in the DIII-D and JT-60U tokamaks is studied. The stronger plasma shaping in DIII-D allows the edge region of DIII-D discharges with Type I ("giant") ELMs to have access to the second region of stability for ideal ballooning modes and larger edge P′than JT-60U Type I ELM discharges. These JT-60U discharges are near the ballooning mode first regime stability limit. DIII-D results support an ideal stability based working model of Type I ELMs as low to intermediate toroidal mode number, n, MHD modes. Results from stability analysis of JT-60U Type I ELM discharges indicate that predictions from this model are also consistent with JT-60U edge stability observations.
