Self-regulated oscillation of transport and topology of magnetic islands in toroidal plasmas

Ida, Katsumi; Kobayashi, Tatsuya; Evans, Todd E.; Inagaki, S.; Austin, Max E.; Shafer, Morgan W.; Ohdachi, Satoshi; Suzuki, Yasuhiro; Itoh, S. -I.; Itoh, K.

doi:10.1038/srep16165

Title: Self-regulated oscillation of transport and topology of magnetic islands in toroidal plasmas

Journal Article · Wed Nov 04 00:00:00 EST 2015 · Scientific Reports

DOI:https://doi.org/10.1038/srep16165· OSTI ID:1295132

Ida, Katsumi ^[1]; Kobayashi, Tatsuya ^[1]; Evans, Todd E. ^[2]; Inagaki, S. ^[3]; Austin, Max E. ^[4]; Shafer, Morgan W. ^[5]; Ohdachi, Satoshi ^[1]; Suzuki, Yasuhiro ^[1]; Itoh, S. -I. ^[3]; Itoh, K. ^[1]

National Inst. for Fusion Science, Gifu (Japan)
General Atomics, San Diego, CA (United States)
Kyushu Univ. (Japan)
Univ. of Texas, Austin, TX (United States)
Oak Ridge National Lab. (ORNL), Oak Ridge, TN (United States)

The coupling between the transport and magnetic topology is an important issue because the structure of magnetic island, embedded in a toroidal equilibrium eld, depends on the nature of the transport at the edge of the island. Measurements of modulated heat pulse propagation in the DIII-D tokamak have revealed the existence of self-regulated oscillations in the radial energy transport into magnetic islands that are indicative of bifurcations in the island structure and transport near the q=2 surface. Large amplitude heat pulses are seen in one state followed by small amplitude pulses later in the discharge resulting in a repeating cycle of island states. These two states are interpreted as a bifurcation of magnetic island with high and low heat pulse accessibility. This report describes the discovery of a bifurcation in the coupled dynamics between transport and topology of magnetic islands in tokamak plasmas.

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Research Organization:: Oak Ridge National Laboratory (ORNL), Oak Ridge, TN (United States); General Atomics, San Diego, CA (United States)

Sponsoring Organization:: USDOE Office of Science (SC); Japan Society for the Promotion of Science (JSPS)

Grant/Contract Number:: AC05-00OR22725; FC02-04ER54698; FG03-97ER54415; 15H02336; 21224014; 23360414

OSTI ID:: 1295132

Alternate ID(s):: OSTI ID: 1259712; OSTI ID: 1351976

Journal Information:: Scientific Reports, Vol. 5; ISSN 2045-2322

Publisher:: Nature Publishing GroupCopyright Statement

Country of Publication:: United States

Language:: English

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Cited by: 19 works

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On the interplay between MHD instabilities and turbulent transport in magnetically confined plasmas Ida, K. Plasma Physics and Controlled Fusion, Vol. 62, Issue 1 https://doi.org/10.1088/1361-6587/ab4827	journal	October 2019
Topological bifurcation of magnetic islands in NSTX-U Wu, W.; Evans, T. E.; Canal, G. P. Nuclear Fusion, Vol. 59, Issue 6 https://doi.org/10.1088/1741-4326/ab127e	journal	April 2019
Reconstruction of high temporal resolution Thomson scattering data during a modulated electron cyclotron resonance heating using conditional averaging Kobayashi, T.; Ida, K.; Itoh, K. Review of Scientific Instruments, Vol. 87, Issue 4 https://doi.org/10.1063/1.4945258	journal	April 2016
Internal transport barrier in tokamak and helical plasmas Ida, K.; Fujita, T. Plasma Physics and Controlled Fusion, Vol. 60, Issue 3 https://doi.org/10.1088/1361-6587/aa9b03	journal	January 2018
Hysteresis Relation between Turbulence and Temperature Modulation during the Heat Pulse Propagation into a Magnetic Island in DIII-D Ida, K.; Kobayashi, T.; Ono, M. Physical Review Letters, Vol. 120, Issue 24 https://doi.org/10.1103/physrevlett.120.245001	journal	June 2018
Bifurcation physics of magnetic islands and stochasticity explored by heat pulse propagation studies in toroidal plasmas Ida, K.; Kobayashi, T.; Yoshinuma, M. Nuclear Fusion, Vol. 56, Issue 9 https://doi.org/10.1088/0029-5515/56/9/092001	journal	July 2016
Influence of m / n = 2/1 magnetic islands on perpendicular flows and turbulence in HL-2A Ohmic plasmas Jiang, M.; Zhong, W. L.; Xu, Y. Nuclear Fusion, Vol. 58, Issue 2 https://doi.org/10.1088/1741-4326/aa9ac0	journal	December 2017
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