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Rev Sci Instrum. 2014 Jun;85(6):063505. doi: 10.1063/1.4883180.

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

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  • 1Pohang University of Science and Technology, Pohang 790-784, South Korea.
  • 2Ulsan National Institute of Science and Technology, Ulsan 689-798, South Korea.
  • 3University of California at Davis, Davis, California 95616, USA.
  • 4Columbia University, New York, New York 10027, USA.
  • 5National Fusion Research Institute, Daejeon 305-333, South Korea.


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.

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