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

Abstract

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.

Authors:

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)

Publication Date:: Wed Nov 04 00:00:00 EST 2015

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

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

OSTI Identifier:: 1295132

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

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

Resource Type:: Accepted Manuscript

Journal Name:: Scientific Reports

Additional Journal Information:: Journal Volume: 5; Journal ID: ISSN 2045-2322

Publisher:: Nature Publishing Group

Country of Publication:: United States

Language:: English

Subject:: 70 PLASMA PHYSICS AND FUSION TECHNOLOGY; magnetically confined plasmas; particle astrophysics

Citation Formats


                    Ida, Katsumi, Kobayashi, Tatsuya, Evans, Todd E., Inagaki, S., Austin, Max E., Shafer, Morgan W., Ohdachi, Satoshi, Suzuki, Yasuhiro, Itoh, S. -I., and Itoh, K. Self-regulated oscillation of transport and topology of magnetic islands in toroidal plasmas.  United States: N. p., 2015. 
Web.  doi:10.1038/srep16165.

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                    Ida, Katsumi, Kobayashi, Tatsuya, Evans, Todd E., Inagaki, S., Austin, Max E., Shafer, Morgan W., Ohdachi, Satoshi, Suzuki, Yasuhiro, Itoh, S. -I., & Itoh, K. Self-regulated oscillation of transport and topology of magnetic islands in toroidal plasmas.  United States.  https://doi.org/10.1038/srep16165

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                    Ida, Katsumi, Kobayashi, Tatsuya, Evans, Todd E., Inagaki, S., Austin, Max E., Shafer, Morgan W., Ohdachi, Satoshi, Suzuki, Yasuhiro, Itoh, S. -I., and Itoh, K. Wed .  
"Self-regulated oscillation of transport and topology of magnetic islands in toroidal plasmas".  United States.  https://doi.org/10.1038/srep16165.  https://www.osti.gov/servlets/purl/1295132.

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@article{osti_1295132,

  title        = {Self-regulated oscillation of transport and topology of magnetic islands in toroidal plasmas},

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

  abstractNote = {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.},

  doi          = {10.1038/srep16165},

  journal      = {Scientific Reports},

  number       = ,

  volume       = 5,

  place        = {United States},

  year         = {Wed Nov 04 00:00:00 EST 2015},

  month        = {Wed Nov 04 00:00:00 EST 2015}

}

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Works referencing / citing this record:

Modulated heat pulse propagation and partial transport barriers in chaotic magnetic fields
journal, April 2016

del-Castillo-Negrete, Diego; Blazevski, Daniel
Physics of Plasmas, Vol. 23, Issue 4
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Topological bifurcation of magnetic islands in NSTX-U
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Modulated heat pulse propagation and partial transport barriers in chaotic magnetic fields
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del-Castillo-Negrete, D.; Blazevski, D.
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Title: Self-regulated oscillation of transport and topology of magnetic islands in toroidal plasmas

Abstract

Citation Formats

Plasmoid-induced-reconnection and fractal reconnection journal, June 2001

Edge stability and transport control with resonant magnetic perturbations in collisionless tokamak plasmas journal, May 2006

Active Control of Type-I Edge-Localized Modes with n = 1 Perturbation Fields in the JET Tokamak journal, June 2007

Self-Consistent Model of Stochastic Magnetic Fields journal, August 1980

The role of stochasticity in sawtooth oscillations journal, March 1992

Observations of secondary structures after collapse events occurring at the q = 2 magnetic surface in the TEXTOR tokamak journal, August 2007

Topology bifurcation of a magnetic flux surface in magnetized plasmas journal, January 2013

Flow damping due to stochastization of the magnetic field journal, January 2015

Some effects of MHD activity on impurity transport in the PBX Tokamak journal, June 1986

Density profile peaking inside m/n=2/1 magnetic islands in TEXTOR-94 journal, November 1997

Nonlinear evolution of tearing modes in inhomogeneous plasmas journal, June 1993

Verification of wavelet analysis for a heat pulse propagation experiment journal, August 2011

A design retrospective of the DIII-D tokamak journal, May 2002

Multi-mode error field correction on the DIII-D tokamak journal, March 2003

Role of plasma response in displacements of the tokamak edge due to applied non-axisymmetric fields journal, June 2013

Self-sustained annihilation of magnetic islands in helical plasmas journal, July 2005

Forced magnetic reconnection journal, January 1985

Helical temperature perturbations associated with tearing modes in tokamak plasmas journal, March 1995

Turbulence spreading into the linearly stable zone and transport scaling journal, April 2004

Dynamics of turbulence spreading in magnetically confined plasmas journal, March 2005

Dynamics of turbulence spreading in magnetically confined plasmas journal, March 2005

A design retrospective of the DIII-D tokamak journal, May 2002

Forced Magnetic Reconnection journal, January 1982

Nonlinear evolution of tearing modes in inhomogeneous plasmas journal, June 1993

Reduction of Ion Thermal Diffusivity Inside a Magnetic Island in JT-60U Tokamak Plasma journal, August 2012

Persistent density perturbations at rational- q surfaces following pellet injection in the Joint European Torus journal, November 1987

Observation of Reduced Heat Transport inside the Magnetic Island O Point in the Large Helical Device journal, February 2004

Effect of Heating on the Suppression of Tearing Modes in Tokamaks journal, January 2007

Plasmoid-Induced-Reconnection and Fractal Reconnection text, January 2001

Modulated heat pulse propagation and partial transport barriers in chaotic magnetic fields journal, April 2016

On the interplay between MHD instabilities and turbulent transport in magnetically confined plasmas journal, October 2019

Topological bifurcation of magnetic islands in NSTX-U journal, April 2019

Reconstruction of high temporal resolution Thomson scattering data during a modulated electron cyclotron resonance heating using conditional averaging journal, April 2016

Internal transport barrier in tokamak and helical plasmas journal, January 2018

Hysteresis Relation between Turbulence and Temperature Modulation during the Heat Pulse Propagation into a Magnetic Island in DIII-D journal, June 2018

Bifurcation physics of magnetic islands and stochasticity explored by heat pulse propagation studies in toroidal plasmas journal, July 2016

Influence of m / n = 2/1 magnetic islands on perpendicular flows and turbulence in HL-2A Ohmic plasmas journal, December 2017

Modulated heat pulse propagation and partial transport barriers in chaotic magnetic fields text, January 2016

Plasmoid-induced-reconnection and fractal reconnection
journal, June 2001

Edge stability and transport control with resonant magnetic perturbations in collisionless tokamak plasmas
journal, May 2006

Active Control of Type-I Edge-Localized Modes with $n = 1$ Perturbation Fields in the JET Tokamak
journal, June 2007

Self-Consistent Model of Stochastic Magnetic Fields
journal, August 1980

The role of stochasticity in sawtooth oscillations
journal, March 1992

Observations of secondary structures after collapse events occurring at the q = 2 magnetic surface in the TEXTOR tokamak
journal, August 2007

Topology bifurcation of a magnetic flux surface in magnetized plasmas
journal, January 2013

Flow damping due to stochastization of the magnetic field
journal, January 2015

Some effects of MHD activity on impurity transport in the PBX Tokamak
journal, June 1986

Density profile peaking inside m/n=2/1 magnetic islands in TEXTOR-94
journal, November 1997

Nonlinear evolution of tearing modes in inhomogeneous plasmas
journal, June 1993

Verification of wavelet analysis for a heat pulse propagation experiment
journal, August 2011

A design retrospective of the DIII-D tokamak
journal, May 2002

Multi-mode error field correction on the DIII-D tokamak
journal, March 2003

Role of plasma response in displacements of the tokamak edge due to applied non-axisymmetric fields
journal, June 2013

Self-sustained annihilation of magnetic islands in helical plasmas
journal, July 2005

Forced magnetic reconnection
journal, January 1985

Helical temperature perturbations associated with tearing modes in tokamak plasmas
journal, March 1995

Turbulence spreading into the linearly stable zone and transport scaling
journal, April 2004

Dynamics of turbulence spreading in magnetically confined plasmas
journal, March 2005

Dynamics of turbulence spreading in magnetically confined plasmas
journal, March 2005

A design retrospective of the DIII-D tokamak
journal, May 2002

Forced Magnetic Reconnection
journal, January 1982

Nonlinear evolution of tearing modes in inhomogeneous plasmas
journal, June 1993

Reduction of Ion Thermal Diffusivity Inside a Magnetic Island in JT-60U Tokamak Plasma
journal, August 2012

Persistent density perturbations at rational- q surfaces following pellet injection in the Joint European Torus
journal, November 1987

Observation of Reduced Heat Transport inside the Magnetic Island O Point in the Large Helical Device
journal, February 2004

Effect of Heating on the Suppression of Tearing Modes in Tokamaks
journal, January 2007

Plasmoid-Induced-Reconnection and Fractal Reconnection
text, January 2001

Modulated heat pulse propagation and partial transport barriers in chaotic magnetic fields
journal, April 2016

On the interplay between MHD instabilities and turbulent transport in magnetically confined plasmas
journal, October 2019

Topological bifurcation of magnetic islands in NSTX-U
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Reconstruction of high temporal resolution Thomson scattering data during a modulated electron cyclotron resonance heating using conditional averaging
journal, April 2016

Internal transport barrier in tokamak and helical plasmas
journal, January 2018

Hysteresis Relation between Turbulence and Temperature Modulation during the Heat Pulse Propagation into a Magnetic Island in DIII-D
journal, June 2018

Bifurcation physics of magnetic islands and stochasticity explored by heat pulse propagation studies in toroidal plasmas
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