Search Menu
DOE PAGES title logo U.S. Department of Energy
Office of Scientific and Technical Information
Search Scholarly Publications

Title: Evidence of toroidally localized turbulence with applied 3D fields in the DIII-D tokamak

Abstract

New evidence indicates that there is significant 3D variation in density fluctuations near the boundary of weakly 3D tokamak plasmas when resonant magnetic perturbations are applied to suppress transient edge instabilities. The increase in fluctuations is concomitant with an increase in the measured density gradient, suggesting that this toroidally localized gradient increase could be a mechanism for turbulence destabilization in localized flux tubes. Two-fluid magnetohydrodynamic simulations find that, although changes to the magnetic field topology are small, there is a significant 3D variation of the density gradient within the flux surfaces that is extended along field lines. This modeling agrees qualitatively with the measurements. The observed gradient and asymmetries are proposed as a mechanism by which global profile gradients in the pedestal could be relaxed due to a local change in the 3D equilibrium. In conclusion, these processes may play an important role in pedestal and scrape-off layer transport in ITER and other future tokamak devices with small applied 3D fields.

Authors:
 [1];  [1];  [2];  [3];  [4];  [4];  [1];  [5];  [2];  [1]
+ Show Author Affiliations
  1. Oak Ridge National Lab. (ORNL), Oak Ridge, TN (United States)
  2. Princeton Plasma Physics Lab. (PPPL), Princeton, NJ (United States)
  3. Univ. of Wisconsin-Madison, Madison, WI (United States)
  4. Univ. of California Los Angeles, Los Angeles, CA (United States)
  5. General Atomics, San Diego, CA (United States)
Publication Date:
Research Org.:
Oak Ridge National Lab. (ORNL), Oak Ridge, TN (United States); General Atomics, San Diego, CA (United States)
Sponsoring Org.:
USDOE Laboratory Directed Research and Development (LDRD) Program; USDOE Office of Nuclear Energy (NE)
OSTI Identifier:
1326530
Alternate Identifier(s):
OSTI ID: 1325845; OSTI ID: 1328678
Grant/Contract Number:  
AC05-00OR22725; AC02-09CH11466; FG02-08ER54999; FG02-08ER54984; FC02-04ER54698
Resource Type:
Accepted Manuscript
Journal Name:
Physical Review Letters
Additional Journal Information:
Journal Volume: 117; Journal Issue: 13; Journal ID: ISSN 0031-9007
Publisher:
American Physical Society (APS)
Country of Publication:
United States
Language:
English
Subject:
70 PLASMA PHYSICS AND FUSION TECHNOLOGY; 73 NUCLEAR PHYSICS AND RADIATION PHYSICS; 72 PHYSICS OF ELEMENTARY PARTICLES AND FIELDS

Citation Formats

Wilcox, R. S., Shafer, M. W., Ferraro, N. M., McKee, G. R., Zeng, L., Rhodes, T. L., Canik, J. M., Paz-Soldan, C., Nazikian, R., and Unterberg, E. A. Evidence of toroidally localized turbulence with applied 3D fields in the DIII-D tokamak. United States: N. p., 2016. Web. doi:10.1103/PhysRevLett.117.135001.
Copy to clipboard
Wilcox, R. S., Shafer, M. W., Ferraro, N. M., McKee, G. R., Zeng, L., Rhodes, T. L., Canik, J. M., Paz-Soldan, C., Nazikian, R., & Unterberg, E. A. Evidence of toroidally localized turbulence with applied 3D fields in the DIII-D tokamak. United States. https://doi.org/10.1103/PhysRevLett.117.135001
Copy to clipboard
Wilcox, R. S., Shafer, M. W., Ferraro, N. M., McKee, G. R., Zeng, L., Rhodes, T. L., Canik, J. M., Paz-Soldan, C., Nazikian, R., and Unterberg, E. A. Wed . "Evidence of toroidally localized turbulence with applied 3D fields in the DIII-D tokamak". United States. https://doi.org/10.1103/PhysRevLett.117.135001. https://www.osti.gov/servlets/purl/1326530.
Copy to clipboard
@article{osti_1326530,
title = {Evidence of toroidally localized turbulence with applied 3D fields in the DIII-D tokamak},
author = {Wilcox, R. S. and Shafer, M. W. and Ferraro, N. M. and McKee, G. R. and Zeng, L. and Rhodes, T. L. and Canik, J. M. and Paz-Soldan, C. and Nazikian, R. and Unterberg, E. A.},
abstractNote = {New evidence indicates that there is significant 3D variation in density fluctuations near the boundary of weakly 3D tokamak plasmas when resonant magnetic perturbations are applied to suppress transient edge instabilities. The increase in fluctuations is concomitant with an increase in the measured density gradient, suggesting that this toroidally localized gradient increase could be a mechanism for turbulence destabilization in localized flux tubes. Two-fluid magnetohydrodynamic simulations find that, although changes to the magnetic field topology are small, there is a significant 3D variation of the density gradient within the flux surfaces that is extended along field lines. This modeling agrees qualitatively with the measurements. The observed gradient and asymmetries are proposed as a mechanism by which global profile gradients in the pedestal could be relaxed due to a local change in the 3D equilibrium. In conclusion, these processes may play an important role in pedestal and scrape-off layer transport in ITER and other future tokamak devices with small applied 3D fields.},
doi = {10.1103/PhysRevLett.117.135001},
journal = {Physical Review Letters},
number = 13,
volume = 117,
place = {United States},
year = {Wed Sep 21 00:00:00 EDT 2016},
month = {Wed Sep 21 00:00:00 EDT 2016}
}
Copy to clipboard
Journal Article:
Free Publicly Available Full Text
Publisher's Version of Record
https://doi.org/10.1103/PhysRevLett.117.135001
Copyright Statement
Other availability
Search WorldCat Search WorldCat to find libraries that may hold this journal
Citation Metrics:
Cited by: 20 works
Citation information provided by
Web of Science
Save / Share:
Export Metadata
Save to My Library
You must Sign In or Create an Account in order to save documents to your library.

Works referenced in this record:

Increase of turbulence and transport with resonant magnetic perturbations in ELM-suppressed plasmas on DIII-D
journal, September 2013

Performance and data analysis aspects of the new DIII-D monostatic profile reflectometer system
journal, November 2014

  • Zeng, L.; Peebles, W. A.; Doyle, E. J.
  • Review of Scientific Instruments, Vol. 85, Issue 11
  • DOI: 10.1063/1.4889775

Suppression and Mitigation of Edge Localized Modes in the DIII-D Tokamak with 3D Magnetic Perturbations
journal, January 2012

Resonant features of energy and particle transport during application of resonant magnetic perturbation fields at TEXTOR and DIII-D
journal, March 2012

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

Progress on the application of ELM control schemes to ITER scenarios from the non-active phase to DT operation
journal, February 2014

Controlling tokamak geometry with three-dimensional magnetic perturbations
journal, October 2014

  • Bird, T. M.; Hegna, C. C.
  • Physics of Plasmas, Vol. 21, Issue 10
  • DOI: 10.1063/1.4898064

Collisionless damping of zonal flows in helical systems
journal, January 2006

  • Sugama, H.; Watanabe, T. -H.
  • Physics of Plasmas, Vol. 13, Issue 1
  • DOI: 10.1063/1.2149311

A novel, multichannel, comb-frequency Doppler backscatter system
journal, October 2010

  • Peebles, W. A.; Rhodes, T. L.; Hillesheim, J. C.
  • Review of Scientific Instruments, Vol. 81, Issue 10
  • DOI: 10.1063/1.3464266

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

  • Evans, Todd E.; Moyer, Richard A.; Burrell, Keith H.
  • Nature Physics, Vol. 2, Issue 6
  • DOI: 10.1038/nphys312

Edge ambipolar potential in toroidal fusion plasmas
journal, May 2014

  • Spizzo, G.; Vianello, N.; White, R. B.
  • Physics of Plasmas, Vol. 21, Issue 5
  • DOI: 10.1063/1.4872173

Calculations of two-fluid linear response to non-axisymmetric fields in tokamaks
journal, May 2012

Microturbulence in DIII-D tokamak pedestal. I. Electrostatic instabilities
journal, April 2014

  • Fulton, D. P.; Lin, Z.; Holod, I.
  • Physics of Plasmas, Vol. 21, Issue 4
  • DOI: 10.1063/1.4871387

Decoupled recovery of energy and momentum with correction of n   =  2 error fields
journal, July 2015

Geometry dependence of stellarator turbulence
journal, November 2009

  • Mynick, H. E.; Xanthopoulos, P.; Boozer, A. H.
  • Physics of Plasmas, Vol. 16, Issue 11
  • DOI: 10.1063/1.3258848

Wide-field turbulence imaging with beam emission spectroscopy
journal, October 2010

  • McKee, G. R.; Fonck, R. J.; Shafer, M. W.
  • Review of Scientific Instruments, Vol. 81, Issue 10
  • DOI: 10.1063/1.3495788

Advances in the physics understanding of ELM suppression using resonant magnetic perturbations in DIII-D
journal, January 2015

Three-dimensional free boundary calculations using a spectral Green's function method
journal, December 1986

    Sort by:
    [ × clear filter / sort ]

    Works referencing / citing this record:

    Helical variation of density profiles and fluctuations in the tokamak pedestal with applied 3D fields and implications for confinement
    journal, May 2018

    • Wilcox, R. S.; Rhodes, T. L.; Shafer, M. W.
    • Physics of Plasmas, Vol. 25, Issue 5
    • DOI: 10.1063/1.5024378

    Poloidally localized edge density fluctuation with applied and spontaneous 3-D fields in experimental advanced superconducting tokamak (EAST)
    journal, September 2019

    • Zhang, T.; Liu, H. Q.; Xiang, H. M.
    • Physics of Plasmas, Vol. 26, Issue 9
    • DOI: 10.1063/1.5119020

    Dynamics of ideal modes and subsequent ELM crashes in 3D tokamak geometry from external magnetic perturbations
    journal, November 2018

    • Willensdorfer, M.; Cote, T. B.; Griener, M.
    • Plasma Physics and Controlled Fusion, Vol. 61, Issue 1
    • DOI: 10.1088/1361-6587/aadc39

    Investigation of RMP induced density pump-out on EAST
    journal, October 2018

    The effect of plasma shape and neutral beam mix on the rotation threshold for RMP-ELM suppression
    journal, March 2019

    Destabilization of field-line localized density fluctuation with a 1/1 internal kink mode in the EAST tokamak
    journal, July 2019

      Sort by:
      [ × clear filter / sort ]

      Similar Records in DOE PAGES and OSTI.GOV collections: