Effects of asymmetries in computations of forced vertical displacement events

Sovinec, C. R.; Bunkers, K. J.

doi:10.1088/1361-6587/aaf124

Title: Effects of asymmetries in computations of forced vertical displacement events

Abstract

Visco-resistive MHD computations with the NIMROD code [J. Comput. Phys. 195 355 (2004)] are applied to a model tokamak configuration that is subjected to induced vertical displacement. The modeling includes anisotropic thermal conduction within an evolving magnetic topology, and parameters separate the Alfvénic, resistive-wall, and plasma-resistive timescales. Contact with the wall leads to increasingly pervasive kink and tearing dynamics. The computed 3D evolution reproduces distinct thermal-quench and current-quench timescales, a positive bump in plasma current, and net horizontal forcing on the resistive wall. The MHD dynamo effect electric field, E_f=-, is analyzed for understanding the nonlinear effects of the fluctuations on the spreading of parallel current density and the resulting bump in plasma current. Forces on the resistive wall are consistent with Pustovitov's analysis [Nucl. Fusion 55 113032 (2015)]; the plasma remains in approximate force-balance with the wall, so net force is accurately computed from integrating stress over the wall's outer surface. Improvements to the modeling that are needed for predictive simulation of asymmetric vertical displacement events are discussed.

Authors:

; Bunkers, K. J.

Publication Date:: Mon Jan 07 00:00:00 EST 2019

Research Org.:: Univ. of Wisconsin‐Madison, Madison, WI (United States)

Sponsoring Org.:: USDOE Office of Science (SC), Fusion Energy Sciences (FES)

OSTI Identifier:: 1489726

Alternate Identifier(s):: OSTI ID: 1482375; OSTI ID: 1482394; OSTI ID: 1482395

Grant/Contract Number:: SC0018001

Resource Type:: Published Article

Journal Name:: Plasma Physics and Controlled Fusion

Additional Journal Information:: Journal Name: Plasma Physics and Controlled Fusion Journal Volume: 61 Journal Issue: 2; Journal ID: ISSN 0741-3335

Publisher:: IOP Publishing

Country of Publication:: United Kingdom

Language:: English

Subject:: 70 PLASMA PHYSICS AND FUSION TECHNOLOGY; tokamak disruption; vertical displacement event; mhd computation; tokamak disruption, vertical displacement event, MHD computation

Citation Formats


                    Sovinec, C. R., and Bunkers, K. J. Effects of asymmetries in computations of forced vertical displacement events.  United Kingdom: N. p., 2019. 
Web.  doi:10.1088/1361-6587/aaf124.

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                    Sovinec, C. R., & Bunkers, K. J. Effects of asymmetries in computations of forced vertical displacement events.  United Kingdom.  https://doi.org/10.1088/1361-6587/aaf124

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                    Sovinec, C. R., and Bunkers, K. J. Mon .  
"Effects of asymmetries in computations of forced vertical displacement events".  United Kingdom.  https://doi.org/10.1088/1361-6587/aaf124.

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@article{osti_1489726,

  title        = {Effects of asymmetries in computations of forced vertical displacement events},

  author       = {Sovinec, C. R. and Bunkers, K. J.},

  abstractNote = {Visco-resistive MHD computations with the NIMROD code [J. Comput. Phys. 195 355 (2004)] are applied to a model tokamak configuration that is subjected to induced vertical displacement. The modeling includes anisotropic thermal conduction within an evolving magnetic topology, and parameters separate the Alfvénic, resistive-wall, and plasma-resistive timescales. Contact with the wall leads to increasingly pervasive kink and tearing dynamics. The computed 3D evolution reproduces distinct thermal-quench and current-quench timescales, a positive bump in plasma current, and net horizontal forcing on the resistive wall. The MHD dynamo effect electric field, E_f=-, is analyzed for understanding the nonlinear effects of the fluctuations on the spreading of parallel current density and the resulting bump in plasma current. Forces on the resistive wall are consistent with Pustovitov's analysis [Nucl. Fusion 55 113032 (2015)]; the plasma remains in approximate force-balance with the wall, so net force is accurately computed from integrating stress over the wall's outer surface. Improvements to the modeling that are needed for predictive simulation of asymmetric vertical displacement events are discussed.},

  doi          = {10.1088/1361-6587/aaf124},

  journal      = {Plasma Physics and Controlled Fusion},

  number       = 2,

  volume       = 61,

  place        = {United Kingdom},

  year         = {Mon Jan 07 00:00:00 EST 2019},

  month        = {Mon Jan 07 00:00:00 EST 2019}

}

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Works referenced in this record:

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Works referencing / citing this record:

Axisymmetric simulations of vertical displacement events in tokamaks: A benchmark of M3D-C ¹ , NIMROD, and JOREK
journal, February 2020

Krebs, I.; Artola, F. J.; Sovinec, C. R.
Physics of Plasmas, Vol. 27, Issue 2
DOI: 10.1063/1.5127664

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Title: Effects of asymmetries in computations of forced vertical displacement events

Abstract

Citation Formats

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

Survey of disruption causes at JET journal, April 2011

Forces between plasma, vessel and TF coils during AVDEs at JET journal, October 2000

The theory of the kink mode during the vertical plasma disruption events in tokamaks journal, June 2008

Wall forces produced during ITER disruptions journal, August 2010

Plasma current asymmetries during disruptions in JET journal, April 2014

Numerical studies of nonlinear evolution of kink modes in tokamaks journal, January 1976

Major Disruptions in Tokamaks journal, May 1980

Nonlinear coupling of tearing modes with self-consistent resistivity evolution in tokamaks journal, January 1980

TSC plasma halo simulation of a DIII-D vertical displacement episode journal, July 1993

High-β Disruption in Tokamaks journal, August 1995

Dynamics of the major disruption of a DIII-D plasma journal, May 2005

Magnetohydrodynamic simulations of massive gas injection into Alcator C-Mod and DIII-D plasmas journal, May 2008

3D MHD VDE and disruptions simulations of tokamaks plasmas including some ITER scenarios journal, February 2009

Three-dimensional non-linear magnetohydrodynamic modeling of massive gas injection triggered disruptions in JET journal, June 2015

Tokamak magneto-hydrodynamics and reference magnetic coordinates for simulations of plasma disruptions journal, June 2015

Inter-code comparison benchmark between DINA and TSC for ITER disruption modelling journal, May 2014

Velocity boundary conditions at a tokamak resistive wall journal, March 2014

Modelling of NSTX hot vertical displacement events using M3D-C1 journal, May 2018

JET disruption studies in support of ITER journal, November 2010

Behaviour of disruptions in Tokamaks journal, January 1984

Disruptions in JET journal, April 1989

Phenomenology of major and minor disruptions in high β deuterium and tritium tokamak fusion test reactor plasma journal, November 1998

Nonlinear magnetohydrodynamics simulation using high-order finite elements journal, March 2004

Understanding disruptions in tokamaks journal, May 2012

Solving the Grad–Shafranov equation with spectral elements journal, May 2014

Analysis of a mixed semi-implicit/implicit algorithm for low-frequency two-fluid plasma modeling journal, August 2010

Stabilization of numerical interchange in spectral-element magnetohydrodynamics journal, August 2016

Progress in understanding disruptions triggered by massive gas injection via 3D non-linear MHD modelling with JOREK journal, October 2016

Three‐dimensional magnetohydrodynamic studies of the reversed‐field pinch journal, January 1985

The dynamo effect in fusion plasmas journal, September 1985

Theoretical Aspects of Energy Confinement in Spheromaks journal, March 1996

Formation and sustainment of electrostatically driven spheromaks in the resistive magnetohydrodynamic model journal, February 2001

Magnetohydrodynamic simulations of direct current helicity injection for current drive in tokamaks journal, March 1996

Current drive by coaxial helicity injection in a spherical torus journal, May 2004

Magnetic reconnection process in transient coaxial helicity injection journal, September 2013

Self-Organized Stationary States of Tokamaks journal, November 2015

Nonlinear dynamics of field maintenance and quasiperiodic relaxation in reversed‐field pinches journal, March 1991

Asymmetric wall force and toroidal rotation in tokamak disruptions journal, August 2015

Boundary conditions for plasma fluid models at the magnetic presheath entrance journal, December 2012

Visible imaging and spectroscopy of disruption runaway electrons in DIII-D journal, April 2013

Cylindrical stationary striations in surface wave produced plasma columns of argon journal, December 2007

Surface currents on ideal plasmas journal, November 2010

Edge plasma boundary layer generated by kink modes in tokamaks journal, June 2011

Modeling of active control of external magnetohydrodynamic instabilities journal, May 2001

Electromagnetic thin-wall model for simulations of plasma wall-touching kink and vertical modes journal, December 2015

Axisymmetric simulations of vertical displacement events in tokamaks: A benchmark of M3D-C 1 , NIMROD, and JOREK journal, February 2020

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

Survey of disruption causes at JET
journal, April 2011

Forces between plasma, vessel and TF coils during AVDEs at JET
journal, October 2000

The theory of the kink mode during the vertical plasma disruption events in tokamaks
journal, June 2008

Wall forces produced during ITER disruptions
journal, August 2010

Plasma current asymmetries during disruptions in JET
journal, April 2014

Numerical studies of nonlinear evolution of kink modes in tokamaks
journal, January 1976

Major Disruptions in Tokamaks
journal, May 1980

Nonlinear coupling of tearing modes with self-consistent resistivity evolution in tokamaks
journal, January 1980

TSC plasma halo simulation of a DIII-D vertical displacement episode
journal, July 1993

High-β Disruption in Tokamaks
journal, August 1995

Dynamics of the major disruption of a DIII-D plasma
journal, May 2005

Magnetohydrodynamic simulations of massive gas injection into Alcator C-Mod and DIII-D plasmas
journal, May 2008

3D MHD VDE and disruptions simulations of tokamaks plasmas including some ITER scenarios
journal, February 2009

Three-dimensional non-linear magnetohydrodynamic modeling of massive gas injection triggered disruptions in JET
journal, June 2015

Tokamak magneto-hydrodynamics and reference magnetic coordinates for simulations of plasma disruptions
journal, June 2015

Inter-code comparison benchmark between DINA and TSC for ITER disruption modelling
journal, May 2014

Velocity boundary conditions at a tokamak resistive wall
journal, March 2014

Modelling of NSTX hot vertical displacement events using M3D-C1
journal, May 2018

JET disruption studies in support of ITER
journal, November 2010

Behaviour of disruptions in Tokamaks
journal, January 1984

Disruptions in JET
journal, April 1989

Phenomenology of major and minor disruptions in high β deuterium and tritium tokamak fusion test reactor plasma
journal, November 1998

Nonlinear magnetohydrodynamics simulation using high-order finite elements
journal, March 2004

Understanding disruptions in tokamaks
journal, May 2012

Solving the Grad–Shafranov equation with spectral elements
journal, May 2014

Analysis of a mixed semi-implicit/implicit algorithm for low-frequency two-fluid plasma modeling
journal, August 2010

Stabilization of numerical interchange in spectral-element magnetohydrodynamics
journal, August 2016

Progress in understanding disruptions triggered by massive gas injection via 3D non-linear MHD modelling with JOREK
journal, October 2016

Three‐dimensional magnetohydrodynamic studies of the reversed‐field pinch
journal, January 1985

The dynamo effect in fusion plasmas
journal, September 1985

Theoretical Aspects of Energy Confinement in Spheromaks
journal, March 1996

Formation and sustainment of electrostatically driven spheromaks in the resistive magnetohydrodynamic model
journal, February 2001

Magnetohydrodynamic simulations of direct current helicity injection for current drive in tokamaks
journal, March 1996

Current drive by coaxial helicity injection in a spherical torus
journal, May 2004

Magnetic reconnection process in transient coaxial helicity injection
journal, September 2013

Self-Organized Stationary States of Tokamaks
journal, November 2015

Nonlinear dynamics of field maintenance and quasiperiodic relaxation in reversed‐field pinches
journal, March 1991

Asymmetric wall force and toroidal rotation in tokamak disruptions
journal, August 2015

Boundary conditions for plasma fluid models at the magnetic presheath entrance
journal, December 2012

Visible imaging and spectroscopy of disruption runaway electrons in DIII-D
journal, April 2013

Cylindrical stationary striations in surface wave produced plasma columns of argon
journal, December 2007

Surface currents on ideal plasmas
journal, November 2010

Edge plasma boundary layer generated by kink modes in tokamaks
journal, June 2011

Modeling of active control of external magnetohydrodynamic instabilities
journal, May 2001

Electromagnetic thin-wall model for simulations of plasma wall-touching kink and vertical modes
journal, December 2015

Axisymmetric simulations of vertical displacement events in tokamaks: A benchmark of M3D-C ¹ , NIMROD, and JOREK
journal, February 2020