Journal
NUCLEAR FUSION
Volume 51, Issue 6, Pages -Publisher
INT ATOMIC ENERGY AGENCY
DOI: 10.1088/0029-5515/51/6/063036
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Funding
- US Department of Energy [DE-AC05-00OR22725, DE-FC02-99ER54512, DE-FG02-04ER54767, DE-AC02-09CH11466]
- United Kingdom Engineering and Physical Sciences Research Council [EP/G003955]
- European Communities
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We report on the status of a set of ITPA-coordinated experiments between the Alcator C-Mod, MAST and NSTX devices to compare the characteristics and access conditions of discharges with small edge-localized modes (ELMs). The small ELMs in C-Mod, MAST and one of the two small ELM types in NSTX exist when beta(pol)(ped) approached 10-15%, although the lower/upper limits of the operational windows differ. These small ELM regimes appear in diverted configurations very close to balanced double-null in each device. We classify these small ELMs as type II, based on the published characteristics from a number of previous studies. In addition, these type II ELMs in each device had multiple filaments with propagation in the co-I(p) or ion diamagnetic drift direction. Moreover, we conclude that these type II ELMs are distinct from the type V ELMs routinely observed in NSTX, which have one or two filaments and propagate in the electron diamagnetic drift direction.
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