Response of multiscale turbulence to electron cyclotron heating in the DIII-D tokamak

T. L. Rhodes; W. A. Peebles; M. A. Van Zeeland; J. S. DeGrassie; R. V. Bravenec; K. H. Burrell; J. C. DeBoo; J. Lohr; C. C. Petty; X. V. Nguyen; E. J. Doyle; C. M. Greenfield; L. Zeng; G. Wang

doi:10.1063/1.2714019

Response of multiscale turbulence to electron cyclotron heating in the DIII-D tokamak

T. L. Rhodes, W. A. Peebles, M. A. Van Zeeland, J. S. DeGrassie, R. V. Bravenec, K. H. Burrell, J. C. DeBoo, J. Lohr, C. C. Petty, X. V. Nguyen, E. J. Doyle, C. M. Greenfield, L. Zeng, G. Wang

Research output: Contribution to journal › Article › peer-review

36 Scopus citations

Abstract

Small-scale density turbulence (k⊥ ρ i ∼4-10) and electron thermal flux are both observed to increase during electron cyclotron heating (ECH) of a high-temperature tokamak plasma (k⊥ is the turbulent wavenumber and ρ i the ion gyroradius). In contrast, large- (k⊥ ρ i 1) and intermediate-scale (k⊥ ρ i ∼1-3) turbulence ñ n levels and ion thermal transport remain effectively constant. This implies that the small-scale turbulence is not a remnant or tail of the ubiquitous, large-scale or intermediate-scale turbulence, and also indicates a potentially important role in determining anomalous electron thermal transport. Radial scans of small-scale turbulence during ECH indicate decreased fluctuations in the deep core compared with increased levels towards the edge. This trend is consistent with linear gyrokinetic growth rate predictions for electron temperature gradient driven instabilities.

Original language	English
Article number	056117
Journal	Physics of Plasmas
Volume	14
Issue number	5
DOIs	https://doi.org/10.1063/1.2714019
State	Published - 2007
Externally published	Yes

Funding

This work was supported by the U.S. Department of Energy under Contract Nos. DE-FG03-01ER54615, DE-FC02-04ER54698, DE-AC05-76OR00033, DE-FG03-97ER54415, and DE-FG02-89ER53296.

Funders	Funder number
U.S. Department of Energy	DE-AC05-76OR00033, DE-FG03-01ER54615, DE-FG03-97ER54415, DE-FC02-04ER54698, DE-FG02-89ER53296

UN SDGs

This output contributes to the following UN Sustainable Development Goals (SDGs)

Access to Document

10.1063/1.2714019

Cite this

Rhodes, T. L., Peebles, W. A., Van Zeeland, M. A., DeGrassie, J. S., Bravenec, R. V., Burrell, K. H., DeBoo, J. C., Lohr, J., Petty, C. C., Nguyen, X. V., Doyle, E. J., Greenfield, C. M., Zeng, L., & Wang, G. (2007). Response of multiscale turbulence to electron cyclotron heating in the DIII-D tokamak. Physics of Plasmas, 14(5), Article 056117. https://doi.org/10.1063/1.2714019

@article{9478e53a39f54cbe953df9d6d65c6c00,

title = "Response of multiscale turbulence to electron cyclotron heating in the DIII-D tokamak",

abstract = "Small-scale density turbulence (k⊥ ρ i ∼4-10) and electron thermal flux are both observed to increase during electron cyclotron heating (ECH) of a high-temperature tokamak plasma (k⊥ is the turbulent wavenumber and ρ i the ion gyroradius). In contrast, large- (k⊥ ρ i 1) and intermediate-scale (k⊥ ρ i ∼1-3) turbulence {\~n} n levels and ion thermal transport remain effectively constant. This implies that the small-scale turbulence is not a remnant or tail of the ubiquitous, large-scale or intermediate-scale turbulence, and also indicates a potentially important role in determining anomalous electron thermal transport. Radial scans of small-scale turbulence during ECH indicate decreased fluctuations in the deep core compared with increased levels towards the edge. This trend is consistent with linear gyrokinetic growth rate predictions for electron temperature gradient driven instabilities.",

author = "Rhodes, {T. L.} and Peebles, {W. A.} and {Van Zeeland}, {M. A.} and DeGrassie, {J. S.} and Bravenec, {R. V.} and Burrell, {K. H.} and DeBoo, {J. C.} and J. Lohr and Petty, {C. C.} and Nguyen, {X. V.} and Doyle, {E. J.} and Greenfield, {C. M.} and L. Zeng and G. Wang",

year = "2007",

doi = "10.1063/1.2714019",

language = "English",

volume = "14",

journal = "Physics of Plasmas",

issn = "1070-664X",

publisher = "American Institute of Physics",

number = "5",

}

TY - JOUR

T1 - Response of multiscale turbulence to electron cyclotron heating in the DIII-D tokamak

AU - Rhodes, T. L.

AU - Peebles, W. A.

AU - Van Zeeland, M. A.

AU - DeGrassie, J. S.

AU - Bravenec, R. V.

AU - Burrell, K. H.

AU - DeBoo, J. C.

AU - Lohr, J.

AU - Petty, C. C.

AU - Nguyen, X. V.

AU - Doyle, E. J.

AU - Greenfield, C. M.

AU - Zeng, L.

AU - Wang, G.

PY - 2007

Y1 - 2007

N2 - Small-scale density turbulence (k⊥ ρ i ∼4-10) and electron thermal flux are both observed to increase during electron cyclotron heating (ECH) of a high-temperature tokamak plasma (k⊥ is the turbulent wavenumber and ρ i the ion gyroradius). In contrast, large- (k⊥ ρ i 1) and intermediate-scale (k⊥ ρ i ∼1-3) turbulence ñ n levels and ion thermal transport remain effectively constant. This implies that the small-scale turbulence is not a remnant or tail of the ubiquitous, large-scale or intermediate-scale turbulence, and also indicates a potentially important role in determining anomalous electron thermal transport. Radial scans of small-scale turbulence during ECH indicate decreased fluctuations in the deep core compared with increased levels towards the edge. This trend is consistent with linear gyrokinetic growth rate predictions for electron temperature gradient driven instabilities.

AB - Small-scale density turbulence (k⊥ ρ i ∼4-10) and electron thermal flux are both observed to increase during electron cyclotron heating (ECH) of a high-temperature tokamak plasma (k⊥ is the turbulent wavenumber and ρ i the ion gyroradius). In contrast, large- (k⊥ ρ i 1) and intermediate-scale (k⊥ ρ i ∼1-3) turbulence ñ n levels and ion thermal transport remain effectively constant. This implies that the small-scale turbulence is not a remnant or tail of the ubiquitous, large-scale or intermediate-scale turbulence, and also indicates a potentially important role in determining anomalous electron thermal transport. Radial scans of small-scale turbulence during ECH indicate decreased fluctuations in the deep core compared with increased levels towards the edge. This trend is consistent with linear gyrokinetic growth rate predictions for electron temperature gradient driven instabilities.

UR - http://www.scopus.com/inward/record.url?scp=34249908325&partnerID=8YFLogxK

U2 - 10.1063/1.2714019

DO - 10.1063/1.2714019

M3 - Article

AN - SCOPUS:34249908325

SN - 1070-664X

VL - 14

JO - Physics of Plasmas

JF - Physics of Plasmas

IS - 5

M1 - 056117

ER -

Response of multiscale turbulence to electron cyclotron heating in the DIII-D tokamak

Abstract

Funding

UN SDGs

Access to Document

Other files and links

Fingerprint

Cite this