Toroidal mode number estimation of the edge-localized modes using the KSTAR 3-D electron cyclotron emission imaging system

A new and more accurate technique is presented for determining the toroidal mode number n of edge-localized modes (ELMs) using two independent electron cyclotron emission imaging (ECEI) systems in the Korea Superconducting Tokamak Advanced Research (KSTAR) device. The technique involves the measurem...

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Bibliographic Details
Published in:Review of scientific instruments 2014-06, Vol.85 (6), p.063505-063505
Main Authors: Lee, J, Yun, G S, Lee, J E, Kim, M, Choi, M J, Lee, W, Park, H K, Domier, C W, Luhmann, Jr, N C, Sabbagh, S A, Park, Y S, Lee, S G, Bak, J G
Format: Article
Language:English
Subjects:
Coils
CYCLOTRONS
EDGE LOCALIZED MODES
ELECTRON CYCLOTRON-RESONANCE
EMISSION
EVALUATION
FILAMENTS
Image reconstruction
INSTRUMENTATION RELATED TO NUCLEAR SCIENCE AND TECHNOLOGY
Pitch (inclination)
Scientific apparatus & instruments
TOKAMAK DEVICES
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Summary:A new and more accurate technique is presented for determining the toroidal mode number n of edge-localized modes (ELMs) using two independent electron cyclotron emission imaging (ECEI) systems in the Korea Superconducting Tokamak Advanced Research (KSTAR) device. The technique involves the measurement of the poloidal spacing between adjacent ELM filaments, and of the pitch angle α* of filaments at the plasma outboard midplane. Equilibrium reconstruction verifies that α* is nearly constant and thus well-defined at the midplane edge. Estimates of n obtained using two ECEI systems agree well with n measured by the conventional technique employing an array of Mirnov coils.
ISSN:0034-6748
1089-7623
DOI:10.1063/1.4883180