ELM Destabilization by Externally Applied Non-Axisymmetric Magnetic Perturbations in NSTX

Conference · Fri Jan 01 00:00:00 EST 2010

OSTI ID:1038505

Canik, John ^[1]; Maingi, Rajesh ^[1]; Evans, T E ^[2]; Bell, R E ^[3]; Gerhardt, S P ^[3]; Kugel, H W ^[3]; LeBlanc, B P ^[3]; Manickam, J ^[3]; Menard, J E ^[3]; Osborne, T H ^[4]; Park, Jin Myung ^[1]; Paul, S ^[3]; Snyder, P B ^[4]; Sabbagh, S A ^[5]; Unterberg, Ezekial A ^[1]

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1. ORNL
2. General Atomics, San Diego
3. Princeton Plasma Physics Laboratory (PPPL)
4. General Atomics
5. Columbia University

We report on a recent set of experiments performed in NSTX to explore the effects of non-axisymmetric magnetic perturbations on the stability of edge-localized modes (ELMs). The application of these 3D fields in NSTX was found to have a strong effect on ELM stability, including the destabilization of ELMs in H-modes otherwise free of large ELMs. Exploiting the effect of the perturbations, ELMs have been controllably introduced into lithium-enhanced ELM-free H-modes, causing a reduction in impurity accumulation while maintaining high confinement. Although these experiments show the principle of the combined use of lithium coatings and 3D fields, further optimization is required in order to reduce the size of the induced ELMs.

• Research Organization: Oak Ridge National Lab. (ORNL), Oak Ridge, TN (United States)
• Sponsoring Organization: USDOE Office of Science (SC)
• DOE Contract Number: DE-AC05-00OR22725
• OSTI ID: 1038505
• Resource Relation: Conference: 4th Workshop on Stochasticity in Fusion Plasmas, Julich, Germany, 20090302, 20090304
• Country of Publication: United States
• Language: English

Related Subjects

70 PLASMA PHYSICS AND FUSION TECHNOLOGY
36 MATERIALS SCIENCE
COATINGS
CONFINEMENT
LITHIUM
OPTIMIZATION
STABILITY