Identification of multiple eigenmode growth rates in DIII-D and EAST tokamak plasmas

Wang, Z. R.; Logan, N. C.; Munaretto, S.; Liu, Y. Q.; Sun, Y. W.; Gu, S.; Park, J. -K.; Hanson, J. M.; Hu, Q. M.; Strait, T.; Nazikian, R.; Kolemen, E.; Menard, J. E.

doi:10.1088/1741-4326/aaf671

Title: Identification of multiple eigenmode growth rates in DIII-D and EAST tokamak plasmas

Journal Article · Tue Jan 09 00:00:00 EST 2018 · Nuclear Fusion

DOI:https://doi.org/10.1088/1741-4326/aaf671· OSTI ID:1477873

Wang, Z. R. ^[1]; Logan, N. C. ^[1]; Munaretto, S. ^[2]; Liu, Y. Q. ^[2]; Sun, Y. W. ^[3]; Gu, S. ^[3]; Park, J. -K. ^[1]; Hanson, J. M. ^[4]; Hu, Q. M. ^[1]; Strait, T. ^[2]; Nazikian, R. ^[1]; Kolemen, E. ^[1]; Menard, J. E. ^[1]

Princeton Plasma Physics Lab. (PPPL), Princeton, NJ (United States)
General Atomics, San Diego, CA (United States)
Chinese Academy of Sciences, Hefei (China)
Columbia Univ., New York, NY (United States)

The successful application of three-dimensional (3D) magnetohydrodynamic (MHD) spectroscopy in the stable DIII-D and EAST plasmas enables to directly extract the multi-mode plasma transfer function in tokamak experiments. The transfer function not only reveals the contribution of each dominant MHD eigenmode in the multi-model plasma response, but also quantifies the corresponding eigenvalue which is the critical stability index of MHD mode. The method performs the active detection of stable plasma by utilizing the upper and lower rows of internal coils to scan the frequency and poloidal spectrum of the applied 3D field, and reconstructing the multi-mode transfer functions model through the least square fitting of the plasma response measured by 3D-field magnetic sensors distributed at different poloidal locations. The results point to the potential development of an advanced strategy for tracking the plasma stability based on the extracted eigenvalues of stable modes. As a result, the improved understanding of the dominant eigenmodes' behavior in multi-mode plasma response through transfer function can also help to optimize the applied 3D fields for the purposes, such as the type-I edge localized mode suppression and the core stability control in future fusion reactors.

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Research Organization:: General Atomics, San Diego, CA (United States); Princeton Plasma Physics Lab. (PPPL), Princeton, NJ (United States)

Sponsoring Organization:: USDOE

Contributing Organization:: This work is also supported by the National Natural Science Foundation of China under 11475224.

Grant/Contract Number:: FC02-04ER54698; AC02-09CH11466

OSTI ID:: 1477873

Alternate ID(s):: OSTI ID: 1558405

Journal Information:: Nuclear Fusion, Vol. 59, Issue 2; ISSN 0029-5515

Publisher:: IOP ScienceCopyright Statement

Country of Publication:: United States

Language:: English

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Cited by: 9 works

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