Observation of a High Performance Operating Regime with Small Edge-Localized Modes in the National Spherical Torus Experiment

Technical Report · Thu May 13 00:00:00 EDT 2004

DOI:https://doi.org/10.2172/827941· OSTI ID:827941

Maingi, R; Tritz, K; Fredrickson, E D; Menard, J E; Sabbagh, S A; Stutman, D; Bell, M G; Bell, R E; Bush, C E; Gates, D A; Johnson, D W; Kaita, R; Kaye, S M; Kugel, H W; LeBlanc, B P; Mueller, D; Raman, R; Roquemore, A L; Soukhanovskii, V A

We report observation of a high performance scenario in the National Spherical Torus Experiment with very small edge-localized modes (ELMs). These ELMs have no measurable impact on stored energy and are consistent with high bootstrap current operation with line average density approaching Greenwald scaling. The ELM perturbation is observed to typically originate near the lower divertor region, as opposed to the outer midplane for ELMs described in the literature. If extrapolable, this scenario would provide an attractive operating regime for next step fusion experiments

• Research Organization: Princeton Plasma Physics Lab. (PPPL), Princeton, NJ (United States)
• Sponsoring Organization: USDOE Office of Science (SC) (US)
• DOE Contract Number: AC02-76CH03073
• OSTI ID: 827941
• Report Number(s): PPPL-3954; TRN: US0403749
• Resource Relation: Other Information: PBD: 13 May 2004
• Country of Publication: United States
• Language: English

Related Subjects

70 PLASMA PHYSICS AND FUSION TECHNOLOGY
BOOTSTRAP CURRENT
DIVERTORS
PERFORMANCE
STORED ENERGY
EDGE PLASMA
SPHERICAL TORUS
X-RAYS
SOFT