Generation of localized lower-hybrid current drive by temperature perturbations

Frank, S. J.; Reiman, A. H.; Fisch, N. J.; Bonoli, P. T.

doi:10.1088/1741-4326/aba3fc

Title: Generation of localized lower-hybrid current drive by temperature perturbations

Abstract

Despite high demonstrated efficiency, lower-hybrid current drive (LHCD) has not been considered localized enough for neoclassical tearing mode (NTM) stabilization in tokamaks. This assessment must be reconsidered in view of the radiofrequency current condensation effect. Here we show that an island with a central hot spot induces significant localization of LHCD. Furthermore, in steady state tokamaks where a significant amount of current is provided by LHCD, passive stabilization of NTMs may occur automatically, particularly as islands become large, without requiring precise aiming of the wave power.

Authors:

Frank, S. J. ^[1]; Reiman, A. H. ^[2]; Fisch, N. J. ^[2]; Bonoli, P. T. ^[1]

Massachusetts Inst. of Technology (MIT), Cambridge, MA (United States)
Princeton Plasma Physics Lab. (PPPL), Princeton, NJ (United States)

Publication Date:: Fri Aug 14 00:00:00 EDT 2020

Research Org.:: Princeton Plasma Physics Laboratory (PPPL), Princeton, NJ (United States)

Sponsoring Org.:: USDOE Office of Science (SC), Advanced Scientific Computing Research (ASCR). Scientific Discovery through Advanced Computing (SciDAC)

OSTI Identifier:: 1818874

Grant/Contract Number:: AC02-09CH11466; FG02-91ER54109; SC0016072; SC0018090

Resource Type:: Accepted Manuscript

Journal Name:: Nuclear Fusion

Additional Journal Information:: Journal Volume: 60; Journal Issue: 9; Journal ID: ISSN 0029-5515

Publisher:: IOP Science

Country of Publication:: United States

Language:: English

Subject:: 70 PLASMA PHYSICS AND FUSION TECHNOLOGY

Citation Formats


                    Frank, S. J., Reiman, A. H., Fisch, N. J., and Bonoli, P. T. Generation of localized lower-hybrid current drive by temperature perturbations.  United States: N. p., 2020. 
Web.  doi:10.1088/1741-4326/aba3fc.

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                    Frank, S. J., Reiman, A. H., Fisch, N. J., & Bonoli, P. T. Generation of localized lower-hybrid current drive by temperature perturbations.  United States.  https://doi.org/10.1088/1741-4326/aba3fc

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                    Frank, S. J., Reiman, A. H., Fisch, N. J., and Bonoli, P. T. Fri .  
"Generation of localized lower-hybrid current drive by temperature perturbations".  United States.  https://doi.org/10.1088/1741-4326/aba3fc.  https://www.osti.gov/servlets/purl/1818874.

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@article{osti_1818874,

  title        = {Generation of localized lower-hybrid current drive by temperature perturbations},

  author       = {Frank, S. J. and Reiman, A. H. and Fisch, N. J. and Bonoli, P. T.},

  abstractNote = {Despite high demonstrated efficiency, lower-hybrid current drive (LHCD) has not been considered localized enough for neoclassical tearing mode (NTM) stabilization in tokamaks. This assessment must be reconsidered in view of the radiofrequency current condensation effect. Here we show that an island with a central hot spot induces significant localization of LHCD. Furthermore, in steady state tokamaks where a significant amount of current is provided by LHCD, passive stabilization of NTMs may occur automatically, particularly as islands become large, without requiring precise aiming of the wave power.},

  doi          = {10.1088/1741-4326/aba3fc},

  journal      = {Nuclear Fusion},

  number       = 9,

  volume       = 60,

  place        = {United States},

  year         = {Fri Aug 14 00:00:00 EDT 2020},

  month        = {Fri Aug 14 00:00:00 EDT 2020}

}

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Works referencing / citing this record:

Two-fluid model of rf current condensation in magnetic islands
text, January 2021

Jin, S.; Reiman, A. H.; Fisch, N. J.
arXiv
DOI: 10.48550/arxiv.2102.11833

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Title: Generation of localized lower-hybrid current drive by temperature perturbations

Abstract

Citation Formats

Coupling of alpha channeling to parallel wavenumber upshift in lower hybrid current drive journal, August 2015

Pulsed RF schemes for tearing mode stabilization journal, June 2020

Concept Design of CFETR Tokamak Machine journal, March 2014

Numerical studies of current generation by radio-frequency traveling waves journal, January 1979

Temperature profile perturbations due to magnetic islands in TEXTOR journal, March 1997

Confining a Tokamak Plasma with rf-Driven Currents journal, September 1978

Paraxial Wentzel–Kramers–Brillouin method applied to the lower hybrid wave propagation journal, August 2012

Alpha channeling with high-field launch of lower hybrid waves journal, November 2015

Currents driven by electron cyclotron waves journal, December 1981

The lower hybrid current drive system for steady-state operation of the Vulcan tokamak conceptual design journal, March 2012

Scaling of the MHD perturbation amplitude required to trigger a disruption and predictions for ITER journal, December 2015

Physics basis for the advanced tokamak fusion power plant, ARIES-AT journal, January 2006

Comparison of the theory and the practice of lower-hybrid current drive journal, October 1985

Current drive at plasma densities required for thermonuclear reactors journal, August 2010

Experiments on neoclassical tearing mode stabilization by ECCD in ASDEX Upgrade journal, May 1999

Slow-wave launching at the lower hybrid frequency using a phased waveguide array journal, February 1976

ARC: A compact, high-field, fusion nuclear science facility and demonstration power plant with demountable magnets journal, November 2015

Toroidal and scattering effects on lower-hybrid wave propagation journal, January 1982

Observation of MHD structures in JET temperature profiles journal, May 1992

Suppression of Tearing Modes by Radio Frequency Current Condensation journal, November 2018

RF current condensation in magnetic islands and associated hysteresis phenomena journal, September 2019

Prospects for stabilization of neoclassical tearing modes by electron cyclotron current drive in ITER journal, March 2009

Stabilization of neoclassical tearing modes by electron cyclotron current drive journal, September 1997

Neoclassical tearing modes and their control journal, May 2006

Full Wave Simulation of Lower Hybrid Waves in ITER Plasmas Based on the Finite Element Method journal, January 2010

Chapter 3: MHD stability, operational limits and disruptions journal, June 2007

Role of the lower hybrid spectrum in the current drive modeling for DEMO scenarios journal, June 2017

Propagation and mode conversion of lower-hybrid waves generated by a finite source journal, January 1974

Linear Theory of Lower Hybrid Heating journal, January 1984

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

Measurement of magnetic island width in long-pulse, high- discharges in JT-60U journal, January 1999

Waveguide launching of lower hybrid waves journal, October 1979

Effect of magnetic and density fluctuations on the propagation of lower hybrid waves in tokamaks journal, December 1992

Studies of various physics effects on an on-axis LHCD experiment using numerical tools journal, August 2018

Interaction of energetic alpha particles with intense lower hybrid waves journal, July 1992

Tearing mode stabilization by electron cyclotron resonance heating demonstrated in the TEXTOR tokamak and the implication for ITER journal, January 2007

Generation of Localized Noninductive Current by Electron Cyclotron Waves on the DIII-D Tokamak journal, November 1999

Suppression of magnetic islands by rf driven currents journal, January 1983

Theory of current drive in plasmas journal, January 1987

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

Non-perturbative measurement of cross-field thermal diffusivity reduction at the O-point of 2/1 neoclassical tearing mode islands in the DIII-D tokamak journal, May 2016

Creating an Asymmetric Plasma Resistivity with Waves journal, September 1980

Physics basis for a reversed shear tokamak power plant journal, December 1997

Saturation of the tearing mode journal, January 1977

Calculations of lower hybrid current drive in ITER journal, June 2011

Plasma transport near the separatrix of a magnetic island journal, August 1997

Heating and current drive by electron cyclotron waves journal, May 2004

On the stabilization of neoclassical magnetohydrodynamic tearing modes using localized current drive or heating journal, August 1997

A fully-neoclassical finite-orbit-width version of the CQL3D Fokker–Planck code journal, September 2016

Complete Stabilization of Neoclassical Tearing Modes with Lower Hybrid Current Drive on COMPASS-D journal, July 2000

Two-fluid model of rf current condensation in magnetic islands text, January 2021

Coupling of alpha channeling to parallel wavenumber upshift in lower hybrid current drive
journal, August 2015

Pulsed RF schemes for tearing mode stabilization
journal, June 2020

Concept Design of CFETR Tokamak Machine
journal, March 2014

Numerical studies of current generation by radio-frequency traveling waves
journal, January 1979

Temperature profile perturbations due to magnetic islands in TEXTOR
journal, March 1997

Confining a Tokamak Plasma with rf-Driven Currents
journal, September 1978

Paraxial Wentzel–Kramers–Brillouin method applied to the lower hybrid wave propagation
journal, August 2012

Alpha channeling with high-field launch of lower hybrid waves
journal, November 2015

Currents driven by electron cyclotron waves
journal, December 1981

The lower hybrid current drive system for steady-state operation of the Vulcan tokamak conceptual design
journal, March 2012

Scaling of the MHD perturbation amplitude required to trigger a disruption and predictions for ITER
journal, December 2015

Physics basis for the advanced tokamak fusion power plant, ARIES-AT
journal, January 2006

Comparison of the theory and the practice of lower-hybrid current drive
journal, October 1985

Current drive at plasma densities required for thermonuclear reactors
journal, August 2010

Experiments on neoclassical tearing mode stabilization by ECCD in ASDEX Upgrade
journal, May 1999

Slow-wave launching at the lower hybrid frequency using a phased waveguide array
journal, February 1976

ARC: A compact, high-field, fusion nuclear science facility and demonstration power plant with demountable magnets
journal, November 2015

Toroidal and scattering effects on lower-hybrid wave propagation
journal, January 1982

Observation of MHD structures in JET temperature profiles
journal, May 1992

Suppression of Tearing Modes by Radio Frequency Current Condensation
journal, November 2018

RF current condensation in magnetic islands and associated hysteresis phenomena
journal, September 2019

Prospects for stabilization of neoclassical tearing modes by electron cyclotron current drive in ITER
journal, March 2009

Stabilization of neoclassical tearing modes by electron cyclotron current drive
journal, September 1997

Neoclassical tearing modes and their control
journal, May 2006

Full Wave Simulation of Lower Hybrid Waves in ITER Plasmas Based on the Finite Element Method
journal, January 2010

Chapter 3: MHD stability, operational limits and disruptions
journal, June 2007

Role of the lower hybrid spectrum in the current drive modeling for DEMO scenarios
journal, June 2017

Propagation and mode conversion of lower-hybrid waves generated by a finite source
journal, January 1974

Linear Theory of Lower Hybrid Heating
journal, January 1984

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

Measurement of magnetic island width in long-pulse, high- discharges in JT-60U
journal, January 1999

Waveguide launching of lower hybrid waves
journal, October 1979

Effect of magnetic and density fluctuations on the propagation of lower hybrid waves in tokamaks
journal, December 1992

Studies of various physics effects on an on-axis LHCD experiment using numerical tools
journal, August 2018

Interaction of energetic alpha particles with intense lower hybrid waves
journal, July 1992

Tearing mode stabilization by electron cyclotron resonance heating demonstrated in the TEXTOR tokamak and the implication for ITER
journal, January 2007

Generation of Localized Noninductive Current by Electron Cyclotron Waves on the DIII-D Tokamak
journal, November 1999

Suppression of magnetic islands by rf driven currents
journal, January 1983

Theory of current drive in plasmas
journal, January 1987

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

Non-perturbative measurement of cross-field thermal diffusivity reduction at the O-point of 2/1 neoclassical tearing mode islands in the DIII-D tokamak
journal, May 2016

Creating an Asymmetric Plasma Resistivity with Waves
journal, September 1980

Physics basis for a reversed shear tokamak power plant
journal, December 1997

Saturation of the tearing mode
journal, January 1977

Calculations of lower hybrid current drive in ITER
journal, June 2011

Plasma transport near the separatrix of a magnetic island
journal, August 1997

Heating and current drive by electron cyclotron waves
journal, May 2004

On the stabilization of neoclassical magnetohydrodynamic tearing modes using localized current drive or heating
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