Observation of a Critical Gradient Threshold for Electron Temperature Fluctuations in the DIII-D Tokamak

Hillesheim, J. C.; DeBoo, J. C.; Peebles, W. A.; Carter, T. A.; Wang, G.; Rhodes, T. L.; Schmitz, L.; McKee, G. R.; Yan, Z.; Staebler, G. M.; Burrell, K. H.; Doyle, E. J.; Holland, C.; Petty, C. C.; Smith, S. P.; White, A. E.; Zeng, L.

doi:10.1103/PhysRevLett.110.045003

Title: Observation of a Critical Gradient Threshold for Electron Temperature Fluctuations in the DIII-D Tokamak

Full Record
Other Related Research

Authors:: Hillesheim, J. C.; DeBoo, J. C.; Peebles, W. A.; Carter, T. A.; Wang, G.; Rhodes, T. L.; Schmitz, L.; McKee, G. R.; Yan, Z.; Staebler, G. M.; Burrell, K. H.; Doyle, E. J.; Holland, C.; Petty, C. C.; Smith, S. P.; White, A. E.; Zeng, L.

Publication Date:: 2013-01-23

Sponsoring Org.:: USDOE

OSTI Identifier:: 1101936

Resource Type:: Publisher's Accepted Manuscript

Journal Name:: Physical Review Letters

Additional Journal Information:: Journal Volume: 110; Journal Issue: 4; Journal ID: ISSN 0031-9007

Publisher:: American Physical Society

Country of Publication:: United States

Language:: English

Citation Formats


                    Hillesheim, J. C., DeBoo, J. C., Peebles, W. A., Carter, T. A., Wang, G., Rhodes, T. L., Schmitz, L., McKee, G. R., Yan, Z., Staebler, G. M., Burrell, K. H., Doyle, E. J., Holland, C., Petty, C. C., Smith, S. P., White, A. E., and Zeng, L.. Observation of a Critical Gradient Threshold for Electron Temperature Fluctuations in the DIII-D Tokamak.  United States: N. p., 2013. 
Web.  doi:10.1103/PhysRevLett.110.045003.

Copy to clipboard


                    Hillesheim, J. C., DeBoo, J. C., Peebles, W. A., Carter, T. A., Wang, G., Rhodes, T. L., Schmitz, L., McKee, G. R., Yan, Z., Staebler, G. M., Burrell, K. H., Doyle, E. J., Holland, C., Petty, C. C., Smith, S. P., White, A. E., & Zeng, L.. Observation of a Critical Gradient Threshold for Electron Temperature Fluctuations in the DIII-D Tokamak.  United States.  https://doi.org/10.1103/PhysRevLett.110.045003

Copy to clipboard


                    Hillesheim, J. C., DeBoo, J. C., Peebles, W. A., Carter, T. A., Wang, G., Rhodes, T. L., Schmitz, L., McKee, G. R., Yan, Z., Staebler, G. M., Burrell, K. H., Doyle, E. J., Holland, C., Petty, C. C., Smith, S. P., White, A. E., and Zeng, L.. Wed .  
"Observation of a Critical Gradient Threshold for Electron Temperature Fluctuations in the DIII-D Tokamak".  United States.  https://doi.org/10.1103/PhysRevLett.110.045003.

Copy to clipboard


                    
@article{osti_1101936,

  title        = {Observation of a Critical Gradient Threshold for Electron Temperature Fluctuations in the DIII-D Tokamak},

  author       = {Hillesheim, J. C. and DeBoo, J. C. and Peebles, W. A. and Carter, T. A. and Wang, G. and Rhodes, T. L. and Schmitz, L. and McKee, G. R. and Yan, Z. and Staebler, G. M. and Burrell, K. H. and Doyle, E. J. and Holland, C. and Petty, C. C. and Smith, S. P. and White, A. E. and Zeng, L.},

  abstractNote = {},

  doi          = {10.1103/PhysRevLett.110.045003},

  journal      = {Physical Review Letters},

  number       = 4,

  volume       = 110,

  place        = {United States},

  year         = {2013},

  month        = {1}

}

Copy to clipboard

Journal Article:

Free Publicly Available Full Text

Accepted Manuscript (Publisher)

Publisher's Version of Record
https://doi.org/10.1103/PhysRevLett.110.045003

Other availability

Search WorldCat to find libraries that may hold this journal

Citation Metrics:

Cited by: 39 works

Citation information provided by
Web of Science

Save / Share:

Export Metadata

Save to My Library

Similar Records in DOE PAGES and OSTI.GOV collections:

Experimental characterization of multiscale and multifield turbulence as a critical gradient threshold is surpassed in the DIII-D tokamak

Journal Article Hillesheim, J. C. ; Peebles, W. A. ; Carter, T. A. ; ... - Physics of Plasmas

A critical gradient for long wavelength (k{sub θ}ρ{sub s}≲0.4) electron temperature fluctuations has been observed in an experiment in the DIII-D tokamak [J. L. Luxon, Nucl. Fusion 42, 614 (2002)], where below a threshold value of L{sub T{sub e}{sup −1}}=|∇T{sub e}|/T{sub e} electron temperature fluctuations are constant and above they steadily increase. Above the critical gradient, the electron heat flux inferred by power balance also increases rapidly. Critical gradients are a predicted attribute of turbulence arising from linear instabilities and are thought to be related to transport stiffness. The presented results are the first direct, systematic demonstration of critical gradientmore »« less
https://doi.org/10.1063/1.4807123
Electron temperature fluctuation measurements and techniques in the DIII-D tokamak

Journal Article Rettig, C L ; Peebles, W A ; Lohr, J ; ... - Review of Scientific Instruments

Several techniques for determining the level and characteristics of electron temperature fluctuations via measurements and analysis of electron cyclotron emission (ECE) have recently been proposed and demonstrated [S. Sattler and H. J. Hartfuss, Plasma Phys. Cont. Fus. {bold 35}, 1285 (1993) and G. Cima {ital et al.}, Phys. Plasmas (1994)]. A technique relying on the correlation of ECE in orthogonal frequency bins but lying within the line broadening of the local emission spectrum is being pursued at DIII-D. Special concerns include the effect of large rotation in the discharges due to neutral beam injection and extremely low fluctuation levels inmore »« less
https://doi.org/10.1063/1.1147613
Electron temperature critical gradient and transport stiffness in DIII-D

Journal Article Smith, Sterling P. ; Petty, Clinton C. ; White, Anne E. ; ... - Nuclear Fusion

The electron energy flux has been probed as a function of electron temperature gradient on the DIII-D tokamak, in a continuing effort to validate turbulent transport models. In the scan of gradient, a critical electron temperature gradient has been found in the electron heat fluxes and stiffness at various radii in L-mode plasmas. The TGLF reduced turbulent transport model [G.M. Staebler et al, Phys. Plasmas 14, 055909 (2007)] and full gyrokinetic GYRO model [J. Candy and R.E. Waltz, J. Comput. Phys. 186, 545 (2003)] recover the general trend of increasing electron energy flux with increasing electron temperature gradient scale length,more »« less
Cited by 17
https://doi.org/10.1088/0029-5515/55/8/083011

Full Text Available
Increased electron temperature turbulence during suppression of edge localized mode by resonant magnetic perturbations in the DIII-D tokamak [Increased electron temperature turbulence during edge localized mode (ELM) suppression by resonant magnetic perturbations (RMPs) in the DIII-D tokamak]

Journal Article Sung, Choongki ; Wang, G. ; Rhodes, Terry L. ; ... - Physics of Plasmas

We report the first observation of increased edge electron temperature turbulence correlated with changes in gradients and the ELM suppression time which occurs after the application of resonant magnetic perturbations (RMP) on DIII-D H-mode plasmas. This increase (T^~_e/T_e approximately doubles) occurs in the region extending from the top of the pedestal outward to the upper part of the edge steep gradient region. This is significant as it is consistent with increased turbulence driven transport potentially replacing some part of the edge localized mode (ELM) driven transport. However, temperature turbulence does not change with the initial RMP application while ELMs aremore »« less
Cited by 16
https://doi.org/10.1063/1.4999785

Full Text Available
COMPARISON OF GKS CALCULATED CRITICAL ION TEMPERATURE GRADIENTS AND ITG GROWTH RATES TO DIII-D MEASURED GRADIENTS AND DIFFUSIVITIES

Journal Article BAKER, DR ; STAEBLER, GM ; PETTY, CC ; ... - PHYS. PLASMAS.

OAK-B135 The gyrokinetic equations predict that various drift type waves or modes can be unstable in a tokamak. For some of these modes, such as the ion temperature gradient (ITG) mode and the electron temperature gradient mode, there exists a critical gradient, above which the mode is unstable. Since the existence of unstable modes can cause increased transport, plasmas which are centrally heated tend to increase in temperature gradient until the modes become unstable. Under some conditions the increased transport can fix the gradient at the critical value. here they present a comparison between the measured ion temperature gradients andmore »« less
https://doi.org/10.1063/1.1621001

Full Text Available

Similar Records