skip to main content
DOE PAGES title logo U.S. Department of Energy
Office of Scientific and Technical Information

Title: Noninductively Driven Tokamak Plasmas at Near-Unity Toroidal Beta

Abstract

Access to and characterization of sustained, toroidally confined plasmas with a very high plasma-to-magnetic pressure ratio (β t), low internal inductance, high elongation, and nonsolenoidal current drive is a central goal of present tokamak plasma research. Stable access to this desirable parameter space is demonstrated in plasmas with ultralow aspect ratio and high elongation. Local helicity injection provides nonsolenoidal sustainment, low internal inductance, and ion heating. Equilibrium analyses indicate β t up to ~100% with a minimum |B| well spanning up to ~50% of the plasma volume.

Authors:
ORCiD logo [1]; ORCiD logo [1]; ORCiD logo [1]; ORCiD logo [1]; ORCiD logo [1]; ORCiD logo [1]; ORCiD logo [1]
  1. Univ. of Wisconsin, Madison, WI (United States). Dept. of Engineering Physics
Publication Date:
Research Org.:
Univ. of Wisconsin, Madison, WI (United States)
Sponsoring Org.:
USDOE Office of Science (SC), Fusion Energy Sciences (FES) (SC-24)
OSTI Identifier:
1377887
Alternate Identifier(s):
OSTI ID: 1371809
Grant/Contract Number:  
FG02-96ER54375
Resource Type:
Accepted Manuscript
Journal Name:
Physical Review Letters
Additional Journal Information:
Journal Volume: 119; Journal Issue: 3; Related Information: D.J. Schlossberg, G.M. Bodner, M.W. Bongard, M.G. Burke, R.J. Fonck, J.M. Perry, and J.A. Reusch, "Public Data Set: Noninductively Driven Tokamak Plasmas at Near-Unity Toroidal Beta," DOI: 10.18138/1340695; Journal ID: ISSN 0031-9007
Publisher:
American Physical Society (APS)
Country of Publication:
United States
Language:
English
Subject:
70 PLASMA PHYSICS AND FUSION TECHNOLOGY; tokamaks; nuclear fusion; equilibrium reconstruction; spherical tokamak; helicity injection; magnetic reconnection

Citation Formats

Schlossberg, David J., Bodner, Grant M., Bongard, Michael W., Burke, Marcus G., Fonck, Raymond J., Perry, Justin M., and Reusch, Joshua A. Noninductively Driven Tokamak Plasmas at Near-Unity Toroidal Beta. United States: N. p., 2017. Web. doi:10.1103/PhysRevLett.119.035001.
Schlossberg, David J., Bodner, Grant M., Bongard, Michael W., Burke, Marcus G., Fonck, Raymond J., Perry, Justin M., & Reusch, Joshua A. Noninductively Driven Tokamak Plasmas at Near-Unity Toroidal Beta. United States. doi:10.1103/PhysRevLett.119.035001.
Schlossberg, David J., Bodner, Grant M., Bongard, Michael W., Burke, Marcus G., Fonck, Raymond J., Perry, Justin M., and Reusch, Joshua A. Sat . "Noninductively Driven Tokamak Plasmas at Near-Unity Toroidal Beta". United States. doi:10.1103/PhysRevLett.119.035001. https://www.osti.gov/servlets/purl/1377887.
@article{osti_1377887,
title = {Noninductively Driven Tokamak Plasmas at Near-Unity Toroidal Beta},
author = {Schlossberg, David J. and Bodner, Grant M. and Bongard, Michael W. and Burke, Marcus G. and Fonck, Raymond J. and Perry, Justin M. and Reusch, Joshua A.},
abstractNote = {Access to and characterization of sustained, toroidally confined plasmas with a very high plasma-to-magnetic pressure ratio (βt), low internal inductance, high elongation, and nonsolenoidal current drive is a central goal of present tokamak plasma research. Stable access to this desirable parameter space is demonstrated in plasmas with ultralow aspect ratio and high elongation. Local helicity injection provides nonsolenoidal sustainment, low internal inductance, and ion heating. Equilibrium analyses indicate βt up to ~100% with a minimum |B| well spanning up to ~50% of the plasma volume.},
doi = {10.1103/PhysRevLett.119.035001},
journal = {Physical Review Letters},
number = 3,
volume = 119,
place = {United States},
year = {2017},
month = {7}
}

Journal Article:
Free Publicly Available Full Text
Publisher's Version of Record

Citation Metrics:
Cited by: 2 works
Citation information provided by
Web of Science

Save / Share:

Works referenced in this record:

Fusion nuclear science facilities and pilot plants based on the spherical tokamak
journal, August 2016


Continuous, edge localized ion heating during non-solenoidal plasma startup and sustainment in a low aspect ratio tokamak
journal, May 2017

  • Burke, M. G.; Barr, J. L.; Bongard, M. W.
  • Nuclear Fusion, Vol. 57, Issue 7, Article No. 076010
  • DOI: 10.1088/1741-4326/aa6f2b

Solenoid-free plasma start-up in spherical tokamaks
journal, September 2014


Recent progress on spherical torus research
journal, April 2015

  • Ono, Masayuki; Kaita, Robert
  • Physics of Plasmas, Vol. 22, Issue 4
  • DOI: 10.1063/1.4915073

Tokamak startup using outboard current injection on the Pegasus Toroidal Experiment
journal, June 2011


Calculation and interpretation of analytic high‐beta poloidal equilibria in finite aspect ratio tokamaks
journal, January 1996

  • Hsu, S. C.; Artun, M.; Cowley, S. C.
  • Physics of Plasmas, Vol. 3, Issue 1
  • DOI: 10.1063/1.871852

H-mode plasmas at very low aspect ratio on the Pegasus Toroidal Experiment
journal, September 2016


Mechanisms of stochastic diffusion of energetic ions in spherical tori
journal, June 2002

  • Kolesnichenko, Ya. I.; White, R. B.; Yakovenko, Yu. V.
  • Physics of Plasmas, Vol. 9, Issue 6
  • DOI: 10.1063/1.1475685

Multi-point, high-speed passive ion velocity distribution diagnostic on the Pegasus Toroidal Experiment
journal, October 2012

  • Burke, M. G.; Fonck, R. J.; Bongard, M. W.
  • Review of Scientific Instruments, Vol. 83, Issue 10
  • DOI: 10.1063/1.4733309

Neoclassical conductivity and bootstrap current formulas for general axisymmetric equilibria and arbitrary collisionality regime
journal, July 1999

  • Sauter, O.; Angioni, C.; Lin-Liu, Y. R.
  • Physics of Plasmas, Vol. 6, Issue 7
  • DOI: 10.1063/1.873240

Equilibrium properties at very low aspect ratio in the Pegasus toroidal experiment
journal, August 2008


Tokamak Startup Using Point-Source dc Helicity Injection
journal, June 2009


High-beta characteristics of first and second-stable spherical tokamaks in reconnection heating experiments of TS-3
journal, August 2003


Overview of JT-60U results leading to high integrated performance in reactor-relevant regimes
journal, December 2003


Optimization of DIII-D advanced tokamak discharges with respect to the β limit
journal, May 2005

  • Ferron, J. R.; Casper, T. A.; Doyle, E. J.
  • Physics of Plasmas, Vol. 12, Issue 5
  • DOI: 10.1063/1.1871247

Integrated plasma physics modelling for the Culham steady state spherical tokamak fusion power plant
journal, July 2004


An optimization of beta in the DIII‐D tokamak
journal, November 1992

  • Lazarus, E. A.; Lao, L. L.; Osborne, T. H.
  • Physics of Fluids B: Plasma Physics, Vol. 4, Issue 11
  • DOI: 10.1063/1.860373

Features of spherical torus plasmas
journal, June 1986


High-performance discharges in the Small Tight Aspect Ratio Tokamak (START)
journal, May 1998

  • Gates, D. A.; Akers, R.; Appel, L.
  • Physics of Plasmas, Vol. 5, Issue 5
  • DOI: 10.1063/1.872819

Aspect ratio scaling of ideal no-wall stability limits in high bootstrap fraction tokamak plasmas
journal, February 2004

  • Menard, J. E.; Bell, M. G.; Bell, R. E.
  • Physics of Plasmas, Vol. 11, Issue 2
  • DOI: 10.1063/1.1640623

The upgraded Pegasus Toroidal Experiment
journal, July 2006


A novel, cost-effective, multi-point Thomson scattering system on the Pegasus Toroidal Experiment (invited)
journal, September 2016

  • Schlossberg, D. J.; Bodner, G. M.; Bongard, M. W.
  • Review of Scientific Instruments, Vol. 87, Issue 11, Article No. 11E403
  • DOI: 10.1063/1.4962193

Wall Stabilization of High Beta Tokamak Discharges in DIII-D
journal, March 1995


Some considerations on closed configurations of magnetohydrostatic equilibrium
journal, February 1968


The direct criterion of Newcomb for the ideal MHD stability of an axisymmetric toroidal plasma
journal, July 2016


Achievement of Record β in the START Spherical Tokamak
journal, May 1998


Energetic particle orbits in the National Spherical Tokamak Experiment
journal, October 1997

  • Mikkelsen, D. R.; White, R. B.; Akers, R. J.
  • Physics of Plasmas, Vol. 4, Issue 10
  • DOI: 10.1063/1.872263

Spherical torus concept as power plants—the ARIES-ST study
journal, February 2003


The spherical tokamak programme at Culham
journal, September 1999


Fishbone Mode in Spherical Tokamaks
journal, April 1999


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


Initial Experiments at High Normalized Current in the Pegasus Toroidal Experiment
journal, December 2006

  • Unterberg, E. A.; Battaglia, D. J.; Bongard, M. W.
  • Journal of Fusion Energy, Vol. 26, Issue 1-2
  • DOI: 10.1007/s10894-006-9056-z

Public Data Set: Non-Inductively Driven Tokamak Plasmas at Near-Unity Toroidal Beta
dataset, July 2017

  • Schlossberg, David; Bodner, Grant; Bongard, Michael
  • Pegasus-Supplementary information for journal article at DOI: 10.1103/PhysRevLett.119.035001, 1 file (3.6 MB)
  • DOI: 10.18138/1340695

Public Data Set: Non-Inductively Driven Tokamak Plasmas at Near-Unity Toroidal Beta
dataset, July 2017

  • Schlossberg, David; Bodner, Grant; Bongard, Michael
  • Pegasus-Supplementary information for journal article at DOI: 10.1103/PhysRevLett.119.035001, 1 file (3.6 MB)
  • DOI: 10.18138/1340695

    Works referencing / citing this record:

    Public Data Set: A Power-Balance Model for Local Helicity Injection Startup in a Spherical Tokamak
    dataset, May 2018

    • Barr, J. L.; Bongard, M. W.; Burke, M. G.
    • Pegasus Public Data Sets
    • DOI: 10.18138/1345037

    Public Data Set: Non-inductively Driven Tokamak Plasmas at Near-Unity βt in the Pegasus Toroidal Experiment
    dataset, March 2018

    • Reusch, Joshua; Bodner, Grant; Bongard, Michael
    • Pegasus-Supplementary information for journal article at DOI: 10.1063/1.5017966, 1 file (5.1 MB)
    • DOI: 10.18138/1410490

    Public Data Set: Initiation and Sustainment of Tokamak Plasmas with Local Helicity Injection as the Majority Current Drive
    dataset, July 2018

    • Perry, Justin; Bodner, Grant; Bongard, Michael
    • Pegasus-Supplementary information for journal article at DOI: https://doi.org/10.1088/1741-4326/aac72e, 1 file (17.1 MB)
    • DOI: 10.18138/1419641

    Public Data Set: Radially Scanning Magnetic Probes to Study Local Helicity Injection Dynamics
    dataset, July 2018

    • Richner, Nathan; Bongard, Michael; Fonck, Raymond
    • Pegasus-Supplementary information for journal article at DOI: 10.1063/1.5036527, 1 file (9.4 MB)
    • DOI: 10.18138/1432455

    Public Data Set: Non-Inductively Driven Tokamak Plasmas at Near-Unity Toroidal Beta
    dataset, July 2017

    • Schlossberg, David; Bodner, Grant; Bongard, Michael
    • Pegasus-Supplementary information for journal article at DOI: 10.1103/PhysRevLett.119.035001, 1 file (3.6 MB)
    • DOI: 10.18138/1340695

    Public Data Set: A Power-Balance Model for Local Helicity Injection Startup in a Spherical Tokamak
    dataset, May 2018

    • Barr, J. L.; Bongard, M. W.; Burke, M. G.
    • Pegasus Public Data Sets
    • DOI: 10.18138/1345037

    Public Data Set: Non-inductively Driven Tokamak Plasmas at Near-Unity βt in the Pegasus Toroidal Experiment
    dataset, March 2018

    • Reusch, Joshua; Bodner, Grant; Bongard, Michael
    • Pegasus-Supplementary information for journal article at DOI: 10.1063/1.5017966, 1 file (5.1 MB)
    • DOI: 10.18138/1410490

    Public Data Set: Initiation and Sustainment of Tokamak Plasmas with Local Helicity Injection as the Majority Current Drive
    dataset, July 2018

    • Perry, Justin; Bodner, Grant; Bongard, Michael
    • Pegasus-Supplementary information for journal article at DOI: https://doi.org/10.1088/1741-4326/aac72e, 1 file (17.1 MB)
    • DOI: 10.18138/1419641

    Public Data Set: Radially Scanning Magnetic Probes to Study Local Helicity Injection Dynamics
    dataset, July 2018

    • Richner, Nathan; Bongard, Michael; Fonck, Raymond
    • Pegasus-Supplementary information for journal article at DOI: 10.1063/1.5036527, 1 file (9.4 MB)
    • DOI: 10.18138/1432455

    Public Data Set: Advancing Local Helicity Injection for Non-Solenoidal Tokamak Startup
    dataset, January 2019

    • Bongard, Michael; Bodner, Grant; Burke, Marcus
    • University of Wisconsin-Madison
    • DOI: 10.18138/1489772

    Public Data Set: Spatial Heterodyne Spectroscopy for High Speed Measurements of Stark Split Neutral Beam Emission in a High Temperature Plasma
    dataset, January 2018

    • Burke, Marcus; Fonck, Raymond; McKee, George
    • University of Wisconsin-Madison
    • DOI: 10.18138/1435641

    Initial Experiments at High Normalized Current in the Pegasus Toroidal Experiment
    journal, December 2006

    • Unterberg, E. A.; Battaglia, D. J.; Bongard, M. W.
    • Journal of Fusion Energy, Vol. 26, Issue 1-2
    • DOI: 10.1007/s10894-006-9056-z

    Mechanisms of stochastic diffusion of energetic ions in spherical tori
    journal, June 2002

    • Kolesnichenko, Ya. I.; White, R. B.; Yakovenko, Yu. V.
    • Physics of Plasmas, Vol. 9, Issue 6
    • DOI: 10.1063/1.1475685

    Aspect ratio scaling of ideal no-wall stability limits in high bootstrap fraction tokamak plasmas
    journal, February 2004

    • Menard, J. E.; Bell, M. G.; Bell, R. E.
    • Physics of Plasmas, Vol. 11, Issue 2
    • DOI: 10.1063/1.1640623

    Optimization of DIII-D advanced tokamak discharges with respect to the β limit
    journal, May 2005

    • Ferron, J. R.; Casper, T. A.; Doyle, E. J.
    • Physics of Plasmas, Vol. 12, Issue 5
    • DOI: 10.1063/1.1871247

    Multi-point, high-speed passive ion velocity distribution diagnostic on the Pegasus Toroidal Experiment
    journal, October 2012

    • Burke, M. G.; Fonck, R. J.; Bongard, M. W.
    • Review of Scientific Instruments, Vol. 83, Issue 10
    • DOI: 10.1063/1.4733309

    Recent progress on spherical torus research
    journal, April 2015

    • Ono, Masayuki; Kaita, Robert
    • Physics of Plasmas, Vol. 22, Issue 4
    • DOI: 10.1063/1.4915073

    The direct criterion of Newcomb for the ideal MHD stability of an axisymmetric toroidal plasma
    journal, July 2016


    A novel, cost-effective, multi-point Thomson scattering system on the Pegasus Toroidal Experiment (invited)
    journal, September 2016

    • Schlossberg, D. J.; Bodner, G. M.; Bongard, M. W.
    • Review of Scientific Instruments, Vol. 87, Issue 11, Article No. 11E403
    • DOI: 10.1063/1.4962193

    Non-inductively driven tokamak plasmas at near-unity βt in the P egasus toroidal experiment
    journal, May 2018

    • Reusch, J. A.; Bodner, G. M.; Bongard, M. W.
    • Physics of Plasmas, Vol. 25, Issue 5
    • DOI: 10.1063/1.5017966

    An optimization of beta in the DIII‐D tokamak
    journal, November 1992

    • Lazarus, E. A.; Lao, L. L.; Osborne, T. H.
    • Physics of Fluids B: Plasma Physics, Vol. 4, Issue 11
    • DOI: 10.1063/1.860373

    Calculation and interpretation of analytic high‐beta poloidal equilibria in finite aspect ratio tokamaks
    journal, January 1996

    • Hsu, S. C.; Artun, M.; Cowley, S. C.
    • Physics of Plasmas, Vol. 3, Issue 1
    • DOI: 10.1063/1.871852

    Energetic particle orbits in the National Spherical Tokamak Experiment
    journal, October 1997

    • Mikkelsen, D. R.; White, R. B.; Akers, R. J.
    • Physics of Plasmas, Vol. 4, Issue 10
    • DOI: 10.1063/1.872263

    High-performance discharges in the Small Tight Aspect Ratio Tokamak (START)
    journal, May 1998

    • Gates, D. A.; Akers, R.; Appel, L.
    • Physics of Plasmas, Vol. 5, Issue 5
    • DOI: 10.1063/1.872819

    Neoclassical conductivity and bootstrap current formulas for general axisymmetric equilibria and arbitrary collisionality regime
    journal, July 1999

    • Sauter, O.; Angioni, C.; Lin-Liu, Y. R.
    • Physics of Plasmas, Vol. 6, Issue 7
    • DOI: 10.1063/1.873240

    Features of spherical torus plasmas
    journal, June 1986


    Overview of JT-60U results leading to high integrated performance in reactor-relevant regimes
    journal, December 2003


    High-beta characteristics of first and second-stable spherical tokamaks in reconnection heating experiments of TS-3
    journal, August 2003


    Integrated plasma physics modelling for the Culham steady state spherical tokamak fusion power plant
    journal, July 2004


    Equilibrium properties at very low aspect ratio in the Pegasus toroidal experiment
    journal, August 2008


    Tokamak startup using outboard current injection on the Pegasus Toroidal Experiment
    journal, June 2011


    Fusion nuclear science facilities and pilot plants based on the spherical tokamak
    journal, August 2016


    H-mode plasmas at very low aspect ratio on the Pegasus Toroidal Experiment
    journal, September 2016


    Solenoid-free plasma start-up in spherical tokamaks
    journal, September 2014


    Continuous, edge localized ion heating during non-solenoidal plasma startup and sustainment in a low aspect ratio tokamak
    journal, May 2017

    • Burke, M. G.; Barr, J. L.; Bongard, M. W.
    • Nuclear Fusion, Vol. 57, Issue 7, Article No. 076010
    • DOI: 10.1088/1741-4326/aa6f2b

    Public Data Set: Advancing Local Helicity Injection for Non-Solenoidal Tokamak Startup
    dataset, January 2019

    • Bongard, Michael; Bodner, Grant; Burke, Marcus
    • University of Wisconsin-Madison
    • DOI: 10.18138/1489772

    Non-inductively driven tokamak plasmas at near-unity βt in the P egasus toroidal experiment
    journal, May 2018

    • Reusch, J. A.; Bodner, G. M.; Bongard, M. W.
    • Physics of Plasmas, Vol. 25, Issue 5
    • DOI: 10.1063/1.5017966

    Public Data Set: Non-Inductively Driven Tokamak Plasmas at Near-Unity Toroidal Beta
    dataset, July 2017

    • Schlossberg, David; Bodner, Grant; Bongard, Michael
    • Pegasus-Supplementary information for journal article at DOI: 10.1103/PhysRevLett.119.035001, 1 file (3.6 MB)
    • DOI: 10.18138/1340695