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

Title: Resonance in fast-wave amplitude in the periphery of cylindrical plasmas and application to edge losses of wave heating power in tokamaks

Abstract

Heating magnetically confined plasmas using waves in the ion-cyclotron range of frequencies typically requires coupling these waves over a steep density gradient. Furthermore, this process has produced an unexpected and deleterious phenomenon on the National Spherical Torus eXperiment (NSTX): a prompt loss of wave power along magnetic field lines in front of the antenna to the divertor. Understanding this loss may be key to achieving effective heating and expanding the operational space of NSTX-Upgrade. Here, we propose that a new type of mode, which conducts a significant fraction of the total wave power in the low-density peripheral plasma, is driving these losses. We demonstrate the existence of such modes, which are distinct from surface modes and coaxial modes, in a cylindrical cold-plasma model when a half wavelength structure fits into the region outside the core plasma. The latter condition generalizes the previous hypothesis regarding the occurence of the edge losses and may explain why full-wave simulations predict these losses in some cases but not others. If valid, this condition implies that outer gap control is a potential strategy for mitigating the losses in NSTX-Upgrade in addition to raising the magnetic field or influencing the edge density.

Authors:
ORCiD logo [1];  [1];  [1]; ORCiD logo [1]; ORCiD logo [1]
  1. Princeton Plasma Physics Laboratory, Princeton, New Jersey 08540, USA
Publication Date:
Research Org.:
Princeton Plasma Physics Lab. (PPPL), Princeton, NJ (United States)
Sponsoring Org.:
USDOE
OSTI Identifier:
1257631
Alternate Identifier(s):
OSTI ID: 1263692
Grant/Contract Number:  
AC02-09CH11466
Resource Type:
Accepted Manuscript
Journal Name:
Physics of Plasmas
Additional Journal Information:
Journal Volume: 23; Journal Issue: 7; Journal ID: ISSN 1070-664X
Publisher:
American Institute of Physics (AIP)
Country of Publication:
United States
Language:
English
Subject:
70 PLASMA PHYSICS AND FUSION TECHNOLOGY; wave heating; cold plasma waves

Citation Formats

Perkins, R. J., Hosea, J. C., Bertelli, N., Taylor, G., and Wilson, J. R. Resonance in fast-wave amplitude in the periphery of cylindrical plasmas and application to edge losses of wave heating power in tokamaks. United States: N. p., 2016. Web. doi:10.1063/1.4954899.
Perkins, R. J., Hosea, J. C., Bertelli, N., Taylor, G., & Wilson, J. R. Resonance in fast-wave amplitude in the periphery of cylindrical plasmas and application to edge losses of wave heating power in tokamaks. United States. doi:10.1063/1.4954899.
Perkins, R. J., Hosea, J. C., Bertelli, N., Taylor, G., and Wilson, J. R. Fri . "Resonance in fast-wave amplitude in the periphery of cylindrical plasmas and application to edge losses of wave heating power in tokamaks". United States. doi:10.1063/1.4954899. https://www.osti.gov/servlets/purl/1257631.
@article{osti_1257631,
title = {Resonance in fast-wave amplitude in the periphery of cylindrical plasmas and application to edge losses of wave heating power in tokamaks},
author = {Perkins, R. J. and Hosea, J. C. and Bertelli, N. and Taylor, G. and Wilson, J. R.},
abstractNote = {Heating magnetically confined plasmas using waves in the ion-cyclotron range of frequencies typically requires coupling these waves over a steep density gradient. Furthermore, this process has produced an unexpected and deleterious phenomenon on the National Spherical Torus eXperiment (NSTX): a prompt loss of wave power along magnetic field lines in front of the antenna to the divertor. Understanding this loss may be key to achieving effective heating and expanding the operational space of NSTX-Upgrade. Here, we propose that a new type of mode, which conducts a significant fraction of the total wave power in the low-density peripheral plasma, is driving these losses. We demonstrate the existence of such modes, which are distinct from surface modes and coaxial modes, in a cylindrical cold-plasma model when a half wavelength structure fits into the region outside the core plasma. The latter condition generalizes the previous hypothesis regarding the occurence of the edge losses and may explain why full-wave simulations predict these losses in some cases but not others. If valid, this condition implies that outer gap control is a potential strategy for mitigating the losses in NSTX-Upgrade in addition to raising the magnetic field or influencing the edge density.},
doi = {10.1063/1.4954899},
journal = {Physics of Plasmas},
number = 7,
volume = 23,
place = {United States},
year = {2016},
month = {7}
}

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

Citation Metrics:
Cited by: 1 work
Citation information provided by
Web of Science

Figures / Tables:

Figure 1 Figure 1: Model geometry and radial density profile.

Save / Share:

Works referenced in this record:

Predicting High Harmonic Ion Cyclotron Heating Efficiency in Tokamak Plasmas
journal, September 2011


Full wave simulations of fast wave heating losses in the scrape-off layer of NSTX and NSTX-U
journal, May 2014


Effect of surface modes on coupling to fast waves in the lower hybrid range of frequencies
journal, October 1992


Edge transport studies in the edge and scrape-off layer of the National Spherical Torus Experiment with Langmuir probes
journal, April 2014

  • Boedo, J. A.; Myra, J. R.; Zweben, S.
  • Physics of Plasmas, Vol. 21, Issue 4
  • DOI: 10.1063/1.4873390

An overview of the ITER project
journal, October 2007


Blob structure and motion in the edge and SOL of NSTX
journal, January 2016

  • Zweben, S. J.; Myra, J. R.; Davis, W. M.
  • Plasma Physics and Controlled Fusion, Vol. 58, Issue 4, Article No. 044007
  • DOI: 10.1088/0741-3335/58/4/044007

Advances in high-harmonic fast wave physics in the National Spherical Torus Experiment
journal, May 2010

  • Taylor, G.; Bell, R. E.; Hosea, J. C.
  • Physics of Plasmas, Vol. 17, Issue 5
  • DOI: 10.1063/1.3371956

Ion cyclotron wave coupling in the magnetized plasma edge of tokamaks: impact of a finite, inhomogeneous density inside the antenna box
journal, March 2016


Dominant Influence of Electron Inertia on Ion Cyclotron-Wave Generation in Plasma
journal, July 1969


Numerical modeling of the coupling of an ICRH antenna with a plasma with self-consistent antenna currents
journal, July 2002


High harmonic fast wave heating efficiency enhancement and current drive at longer wavelength on the National Spherical Torus Experiment
journal, May 2008

  • Hosea, J.; Bell, R. E.; LeBlanc, B. P.
  • Physics of Plasmas, Vol. 15, Issue 5
  • DOI: 10.1063/1.2837051

Effect of the plasma density profile on ion-cyclotron wave generation
journal, January 1973


Simulation of high-power electromagnetic wave heating in the ITER burning plasma
journal, July 2008

  • Jaeger, E. F.; Berry, L. A.; D’Azevedo, E. F.
  • Physics of Plasmas, Vol. 15, Issue 7
  • DOI: 10.1063/1.2959128

Ion Cyclotron Wave Generation in the Model C Stellarator
journal, January 1970


Resonance in Fast-Wave Amplitude in the Periphery of Cylindrical Plasmas and Application to Edge Losses of Wave Heating Power in Tokamaks
dataset, January 2016

  • Perkins, R. J.; Hosea, J. C.; Bertelli, N.
  • Princeton Plasma Physics Laboratory (PPPL), Princeton, NJ (United States)
  • DOI: 10.11578/1366752

Resonance in Fast-Wave Amplitude in the Periphery of Cylindrical Plasmas and Application to Edge Losses of Wave Heating Power in Tokamaks
dataset, January 2016

  • Perkins, R.; Hosea, J.; Bertelli, N.
  • Princeton Plasma Physics Laboratory (PPPL), Princeton, NJ (United States)
  • DOI: 10.11578/1562047

    Works referencing / citing this record:

    Resonance in Fast-Wave Amplitude in the Periphery of Cylindrical Plasmas and Application to Edge Losses of Wave Heating Power in Tokamaks
    dataset, January 2016

    • Perkins, R. J.; Hosea, J. C.; Bertelli, N.
    • Princeton Plasma Physics Laboratory (PPPL), Princeton, NJ (United States)
    • DOI: 10.11578/1366752

    Resonance in Fast-Wave Amplitude in the Periphery of Cylindrical Plasmas and Application to Edge Losses of Wave Heating Power in Tokamaks
    dataset, January 2016

    • Perkins, R. J.; Hosea, J. C.; Bertelli, N.
    • Princeton Plasma Physics Laboratory (PPPL), Princeton, NJ (United States)
    • DOI: 10.11578/1366752

    An overview of the ITER project
    journal, October 2007


    Ion Cyclotron Wave Generation in the Model C Stellarator
    journal, January 1970


    Effect of the plasma density profile on ion-cyclotron wave generation
    journal, January 1973


    High harmonic fast wave heating efficiency enhancement and current drive at longer wavelength on the National Spherical Torus Experiment
    journal, May 2008

    • Hosea, J.; Bell, R. E.; LeBlanc, B. P.
    • Physics of Plasmas, Vol. 15, Issue 5
    • DOI: 10.1063/1.2837051

    Simulation of high-power electromagnetic wave heating in the ITER burning plasma
    journal, July 2008

    • Jaeger, E. F.; Berry, L. A.; D’Azevedo, E. F.
    • Physics of Plasmas, Vol. 15, Issue 7
    • DOI: 10.1063/1.2959128

    Advances in high-harmonic fast wave physics in the National Spherical Torus Experiment
    journal, May 2010

    • Taylor, G.; Bell, R. E.; Hosea, J. C.
    • Physics of Plasmas, Vol. 17, Issue 5
    • DOI: 10.1063/1.3371956

    Edge transport studies in the edge and scrape-off layer of the National Spherical Torus Experiment with Langmuir probes
    journal, April 2014

    • Boedo, J. A.; Myra, J. R.; Zweben, S.
    • Physics of Plasmas, Vol. 21, Issue 4
    • DOI: 10.1063/1.4873390

    Full wave simulations of fast wave heating losses in the scrape-off layer of NSTX and NSTX-U
    journal, May 2014


    Blob structure and motion in the edge and SOL of NSTX
    journal, January 2016

    • Zweben, S. J.; Myra, J. R.; Davis, W. M.
    • Plasma Physics and Controlled Fusion, Vol. 58, Issue 4, Article No. 044007
    • DOI: 10.1088/0741-3335/58/4/044007

    Ion cyclotron wave coupling in the magnetized plasma edge of tokamaks: impact of a finite, inhomogeneous density inside the antenna box
    journal, March 2016


    Resonance in Fast-Wave Amplitude in the Periphery of Cylindrical Plasmas and Application to Edge Losses of Wave Heating Power in Tokamaks
    dataset, January 2016

    • Perkins, R.; Hosea, J.; Bertelli, N.
    • Princeton Plasma Physics Laboratory (PPPL), Princeton, NJ (United States)
    • DOI: 10.11578/1562047

      Figures/Tables have been extracted from DOE-funded journal article accepted manuscripts.