Multi-field/multi-scale turbulence response to electron cyclotron heating of DIII-D ohmic plasmas

G. Wang; W. A. Peebles; T. L. Rhodes; J. C. Deboo; G. M. Staebler; J. C. Hillesheim; Z. Yan; G. R. McKee; C. C. Petty; W. M. Solomon; K. H. Burrell; E. J. Doyle; A. W. Leonard; L. Schmitz; M. A. Vanzeeland; A. E. White; L. Zeng

doi:10.1063/1.3610552

Multi-field/multi-scale turbulence response to electron cyclotron heating of DIII-D ohmic plasmas

G. Wang, W. A. Peebles, T. L. Rhodes, J. C. Deboo, G. M. Staebler, J. C. Hillesheim, Z. Yan, G. R. McKee, C. C. Petty, W. M. Solomon, K. H. Burrell, E. J. Doyle, A. W. Leonard, L. Schmitz, M. A. Vanzeeland, A. E. White, L. Zeng

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Abstract

The multi-fieldmulti-scale core ( ∼ 0.5-0.8) turbulence response to electron cyclotron heating (ECH) of DIII-D Ohmic plasmas is reported for the first time. Long wavelength (low- k) electron temperature (T e / T e) and high- k density turbulence levels (n e / n e) are observed to strongly increase during ECH. In contrast, low- k and intermediate- k n e / n e showed little change, whereas the cross-phase between local low- k electron temperature and density fluctuations ( n e T e) was significantly modified. The increase in the electron thermal diffusivity determined from power balance is consistent with the increased turbulent transport correlated with the measured increases in low- k T e / T e and high- k n e / n e. Linear stability analysis using the trapped gyro-Landau fluid (TGLF) model indicates an enhanced growth rate for electron modes e.g., trapped electron mode (TEM) at low- k consistent with the observed modifications in T e / T e and n e T e. TGLF also predicts an increase in high- k electron mode growth rates for normalized wavenumbers k s 7, where electron temperature gradient (ETG) modes exist, which is consistent with the observed increase in high- k n e / n e turbulence

Original language	English
Article number	082504
Journal	Physics of Plasmas
Volume	18
Issue number	8
DOIs	https://doi.org/10.1063/1.3610552
State	Published - Aug 2011
Externally published	Yes

Funding

This work supported by the U.S. Department of Energy under DE-FG02-08ER54984, DE-FC02-04ER54698, DE-FG02-89ER53296, DE-FG02-08ER54999, DE-AC02-09CH11466, and DE-FC02-93ER54186.

Funders	Funder number
U.S. Department of Energy	DE-FG02-08ER54999, DE-FG02-08ER54984, DE-AC02-09CH11466, DE-FC02-04ER54698, DE-FC02-93ER54186, DE-FG02-89ER53296

UN SDGs

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

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10.1063/1.3610552

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Wang, G., Peebles, W. A., Rhodes, T. L., Deboo, J. C., Staebler, G. M., Hillesheim, J. C., Yan, Z., McKee, G. R., Petty, C. C., Solomon, W. M., Burrell, K. H., Doyle, E. J., Leonard, A. W., Schmitz, L., Vanzeeland, M. A., White, A. E., & Zeng, L. (2011). Multi-field/multi-scale turbulence response to electron cyclotron heating of DIII-D ohmic plasmas. Physics of Plasmas, 18(8), Article 082504. https://doi.org/10.1063/1.3610552

@article{4c9b53039f3342ed9f5b2d6ce66bd4dd,

title = "Multi-field/multi-scale turbulence response to electron cyclotron heating of DIII-D ohmic plasmas",

abstract = "The multi-fieldmulti-scale core ( ∼ 0.5-0.8) turbulence response to electron cyclotron heating (ECH) of DIII-D Ohmic plasmas is reported for the first time. Long wavelength (low- k) electron temperature (T e / T e) and high- k density turbulence levels (n e / n e) are observed to strongly increase during ECH. In contrast, low- k and intermediate- k n e / n e showed little change, whereas the cross-phase between local low- k electron temperature and density fluctuations ( n e T e) was significantly modified. The increase in the electron thermal diffusivity determined from power balance is consistent with the increased turbulent transport correlated with the measured increases in low- k T e / T e and high- k n e / n e. Linear stability analysis using the trapped gyro-Landau fluid (TGLF) model indicates an enhanced growth rate for electron modes e.g., trapped electron mode (TEM) at low- k consistent with the observed modifications in T e / T e and n e T e. TGLF also predicts an increase in high- k electron mode growth rates for normalized wavenumbers k s 7, where electron temperature gradient (ETG) modes exist, which is consistent with the observed increase in high- k n e / n e turbulence",

author = "G. Wang and Peebles, {W. A.} and Rhodes, {T. L.} and Deboo, {J. C.} and Staebler, {G. M.} and Hillesheim, {J. C.} and Z. Yan and McKee, {G. R.} and Petty, {C. C.} and Solomon, {W. M.} and Burrell, {K. H.} and Doyle, {E. J.} and Leonard, {A. W.} and L. Schmitz and Vanzeeland, {M. A.} and White, {A. E.} and L. Zeng",

year = "2011",

month = aug,

doi = "10.1063/1.3610552",

language = "English",

volume = "18",

journal = "Physics of Plasmas",

issn = "1070-664X",

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Wang, G, Peebles, WA, Rhodes, TL, Deboo, JC, Staebler, GM, Hillesheim, JC, Yan, Z, McKee, GR, Petty, CC, Solomon, WM, Burrell, KH, Doyle, EJ, Leonard, AW, Schmitz, L, Vanzeeland, MA, White, AE & Zeng, L 2011, 'Multi-field/multi-scale turbulence response to electron cyclotron heating of DIII-D ohmic plasmas', Physics of Plasmas, vol. 18, no. 8, 082504. https://doi.org/10.1063/1.3610552

TY - JOUR

T1 - Multi-field/multi-scale turbulence response to electron cyclotron heating of DIII-D ohmic plasmas

AU - Wang, G.

AU - Peebles, W. A.

AU - Rhodes, T. L.

AU - Deboo, J. C.

AU - Staebler, G. M.

AU - Hillesheim, J. C.

AU - Yan, Z.

AU - McKee, G. R.

AU - Petty, C. C.

AU - Solomon, W. M.

AU - Burrell, K. H.

AU - Doyle, E. J.

AU - Leonard, A. W.

AU - Schmitz, L.

AU - Vanzeeland, M. A.

AU - White, A. E.

AU - Zeng, L.

PY - 2011/8

Y1 - 2011/8

N2 - The multi-fieldmulti-scale core ( ∼ 0.5-0.8) turbulence response to electron cyclotron heating (ECH) of DIII-D Ohmic plasmas is reported for the first time. Long wavelength (low- k) electron temperature (T e / T e) and high- k density turbulence levels (n e / n e) are observed to strongly increase during ECH. In contrast, low- k and intermediate- k n e / n e showed little change, whereas the cross-phase between local low- k electron temperature and density fluctuations ( n e T e) was significantly modified. The increase in the electron thermal diffusivity determined from power balance is consistent with the increased turbulent transport correlated with the measured increases in low- k T e / T e and high- k n e / n e. Linear stability analysis using the trapped gyro-Landau fluid (TGLF) model indicates an enhanced growth rate for electron modes e.g., trapped electron mode (TEM) at low- k consistent with the observed modifications in T e / T e and n e T e. TGLF also predicts an increase in high- k electron mode growth rates for normalized wavenumbers k s 7, where electron temperature gradient (ETG) modes exist, which is consistent with the observed increase in high- k n e / n e turbulence

AB - The multi-fieldmulti-scale core ( ∼ 0.5-0.8) turbulence response to electron cyclotron heating (ECH) of DIII-D Ohmic plasmas is reported for the first time. Long wavelength (low- k) electron temperature (T e / T e) and high- k density turbulence levels (n e / n e) are observed to strongly increase during ECH. In contrast, low- k and intermediate- k n e / n e showed little change, whereas the cross-phase between local low- k electron temperature and density fluctuations ( n e T e) was significantly modified. The increase in the electron thermal diffusivity determined from power balance is consistent with the increased turbulent transport correlated with the measured increases in low- k T e / T e and high- k n e / n e. Linear stability analysis using the trapped gyro-Landau fluid (TGLF) model indicates an enhanced growth rate for electron modes e.g., trapped electron mode (TEM) at low- k consistent with the observed modifications in T e / T e and n e T e. TGLF also predicts an increase in high- k electron mode growth rates for normalized wavenumbers k s 7, where electron temperature gradient (ETG) modes exist, which is consistent with the observed increase in high- k n e / n e turbulence

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U2 - 10.1063/1.3610552

DO - 10.1063/1.3610552

M3 - Article

AN - SCOPUS:80052416913

SN - 1070-664X

VL - 18

JO - Physics of Plasmas

JF - Physics of Plasmas

IS - 8

M1 - 082504

ER -

Multi-field/multi-scale turbulence response to electron cyclotron heating of DIII-D ohmic plasmas

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