Broad wavenumber turbulence measurements during neutral beam injection on the DIII-D Tokamak

T. L. Rhodes; W. A. Peebles; M. A. Van Zeeland; J. S. Degrassie; G. R. McKee; G. M. Staebler; J. C. Deboo; E. J. Doyle; M. Gilmore; P. Gohil; C. M. Greenfield; R. J. Groebner; X. V. Nguyen; G. Wang; L. Zeng

doi:10.1088/0029-5515/47/8/027

Broad wavenumber turbulence measurements during neutral beam injection on the DIII-D Tokamak

T. L. Rhodes, W. A. Peebles, M. A. Van Zeeland, J. S. Degrassie, G. R. McKee, G. M. Staebler, J. C. Deboo, E. J. Doyle, M. Gilmore, P. Gohil, C. M. Greenfield, R. J. Groebner, X. V. Nguyen, G. Wang, L. Zeng

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Abstract

Density fluctuation measurements covering a wavenumber range relevant to ITG, TEM and ETG type instabilities (k_⊥ ρ_i ≈ 0.2→ 10) are compared during Ohmic and neutral beam injection (NBI). These short time duration NBI perturbations modified the background temperature as well as the density fluctuation behaviour but had little effect on the background density. It is found that both the measured and calculated responses to these perturbations varied with wavenumber supporting the need for broad wavenumber comparisons. The experimentally measured fluctuation changes and calculated growth rates (from the linear gyrokinetic code GKS) show qualitative similarities to each other at low and intermediate k while the comparison at high k is inconclusive.

Original language	English
Article number	027
Pages (from-to)	936-942
Number of pages	7
Journal	Nuclear Fusion
Volume	47
Issue number	8
DOIs	https://doi.org/10.1088/0029-5515/47/8/027
State	Published - Aug 1 2007
Externally published	Yes

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Rhodes, T. L., Peebles, W. A., Van Zeeland, M. A., Degrassie, J. S., McKee, G. R., Staebler, G. M., Deboo, J. C., Doyle, E. J., Gilmore, M., Gohil, P., Greenfield, C. M., Groebner, R. J., Nguyen, X. V., Wang, G., & Zeng, L. (2007). Broad wavenumber turbulence measurements during neutral beam injection on the DIII-D Tokamak. Nuclear Fusion, 47(8), 936-942. Article 027. https://doi.org/10.1088/0029-5515/47/8/027

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title = "Broad wavenumber turbulence measurements during neutral beam injection on the DIII-D Tokamak",

abstract = "Density fluctuation measurements covering a wavenumber range relevant to ITG, TEM and ETG type instabilities (k⊥ ρi ≈ 0.2→ 10) are compared during Ohmic and neutral beam injection (NBI). These short time duration NBI perturbations modified the background temperature as well as the density fluctuation behaviour but had little effect on the background density. It is found that both the measured and calculated responses to these perturbations varied with wavenumber supporting the need for broad wavenumber comparisons. The experimentally measured fluctuation changes and calculated growth rates (from the linear gyrokinetic code GKS) show qualitative similarities to each other at low and intermediate k while the comparison at high k is inconclusive.",

author = "Rhodes, {T. L.} and Peebles, {W. A.} and {Van Zeeland}, {M. A.} and Degrassie, {J. S.} and McKee, {G. R.} and Staebler, {G. M.} and Deboo, {J. C.} and Doyle, {E. J.} and M. Gilmore and P. Gohil and Greenfield, {C. M.} and Groebner, {R. J.} and Nguyen, {X. V.} and G. Wang and L. Zeng",

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Rhodes, TL, Peebles, WA, Van Zeeland, MA, Degrassie, JS, McKee, GR, Staebler, GM, Deboo, JC, Doyle, EJ, Gilmore, M, Gohil, P, Greenfield, CM, Groebner, RJ, Nguyen, XV, Wang, G & Zeng, L 2007, 'Broad wavenumber turbulence measurements during neutral beam injection on the DIII-D Tokamak', Nuclear Fusion, vol. 47, no. 8, 027, pp. 936-942. https://doi.org/10.1088/0029-5515/47/8/027

TY - JOUR

T1 - Broad wavenumber turbulence measurements during neutral beam injection on the DIII-D Tokamak

AU - Rhodes, T. L.

AU - Peebles, W. A.

AU - Van Zeeland, M. A.

AU - Degrassie, J. S.

AU - McKee, G. R.

AU - Staebler, G. M.

AU - Deboo, J. C.

AU - Doyle, E. J.

AU - Gilmore, M.

AU - Gohil, P.

AU - Greenfield, C. M.

AU - Groebner, R. J.

AU - Nguyen, X. V.

AU - Wang, G.

AU - Zeng, L.

PY - 2007/8/1

Y1 - 2007/8/1

N2 - Density fluctuation measurements covering a wavenumber range relevant to ITG, TEM and ETG type instabilities (k⊥ ρi ≈ 0.2→ 10) are compared during Ohmic and neutral beam injection (NBI). These short time duration NBI perturbations modified the background temperature as well as the density fluctuation behaviour but had little effect on the background density. It is found that both the measured and calculated responses to these perturbations varied with wavenumber supporting the need for broad wavenumber comparisons. The experimentally measured fluctuation changes and calculated growth rates (from the linear gyrokinetic code GKS) show qualitative similarities to each other at low and intermediate k while the comparison at high k is inconclusive.

AB - Density fluctuation measurements covering a wavenumber range relevant to ITG, TEM and ETG type instabilities (k⊥ ρi ≈ 0.2→ 10) are compared during Ohmic and neutral beam injection (NBI). These short time duration NBI perturbations modified the background temperature as well as the density fluctuation behaviour but had little effect on the background density. It is found that both the measured and calculated responses to these perturbations varied with wavenumber supporting the need for broad wavenumber comparisons. The experimentally measured fluctuation changes and calculated growth rates (from the linear gyrokinetic code GKS) show qualitative similarities to each other at low and intermediate k while the comparison at high k is inconclusive.

UR - http://www.scopus.com/inward/record.url?scp=34547815757&partnerID=8YFLogxK

U2 - 10.1088/0029-5515/47/8/027

DO - 10.1088/0029-5515/47/8/027

M3 - Article

AN - SCOPUS:34547815757

SN - 0029-5515

VL - 47

SP - 936

EP - 942

JO - Nuclear Fusion

JF - Nuclear Fusion

IS - 8

M1 - 027

ER -

Broad wavenumber turbulence measurements during neutral beam injection on the DIII-D Tokamak

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