Published in
IOP Publishing, Nuclear Fusion, 3(41), p. 295-300
DOI: 10.1088/0029-5515/41/3/306
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Dependence of edge stability on plasma shape and local pressure gradients in the DIII-D and JT-60U tokamaks
,
Kh H. Burrell,
Vs S. Chan,
P. B. Snyder,
M. S. Chance,
E. J. Strait,
T. Hatae,
S. Takeji,
M. S. Chu,
A. Isayama,
T. Takizuka,
T. S. Taylor
and other authors.
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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 a larger edge pedestal pressure gradient P' than JT-60U type I ELM discharges. These JT-60U discharges are near the ballooning mode first regime stability limit. The DIII-D results support an ideal stability based working model of type I ELMs as low to intermediate toroidal mode number, n, MHD modes. The results from a stability analysis of JT-60U type I ELM discharges indicate that the predictions of this model are also consistent with JT-60U edge stability observations.