Quantitative density fluctuation measurements utilizing quadrature reflectometers on DIII-D

G. Wang; W. A. Peebles; T. L. Rhodes; G. J. Kramer; E. J. Doyle; G. R. McKee; R. Nazikian; N. A. Crocker; X. Nguyen; L. Zeng; S. Kubota; M. A. VanZeeland

doi:10.1088/0029-5515/46/9/S06

Quantitative density fluctuation measurements utilizing quadrature reflectometers on DIII-D

G. Wang, W. A. Peebles, T. L. Rhodes, G. J. Kramer, E. J. Doyle, G. R. McKee, R. Nazikian, N. A. Crocker, X. Nguyen, L. Zeng, S. Kubota, M. A. VanZeeland

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22 Scopus citations

Abstract

Fixed-frequency reflectometers utilizing quadrature phase detection are employed on DIII-D to study both coherent and turbulent density fluctuations. For coherent fluctuations, the reconstructed phase information successfully identifies MHD/coherent mode activity, e.g. tearing modes, compressional Alfvén eigenmodes, etc. For an m ≤ 3/n ≤ 2 tearing mode, a basic 1D phase screen model is applied to infer fluctuation levels, and the result is consistent with the beam emission spectroscopy (BES) measurement. For turbulent fluctuation studies, a 2D full-wave code (Valeo E.J., Kramer G.J. and Nazikian R. 2002 Plasma Phys. Control. Fusion 44 L1) is applied to interpret reflectometry data obtained in the H-mode edge pedestal region to deduce density fluctuation levels. The measurement is simulated using realistic geometry, plasma conditions and antenna patterns. Comparison of the fluctuation level deduced from the 2D code with BES measurement shows reasonable agreement.

Original language	English (US)
Article number	S06
Pages (from-to)	S708-S713
Journal	Nuclear Fusion
Volume	46
Issue number	9
DOIs	https://doi.org/10.1088/0029-5515/46/9/S06
State	Published - Sep 1 2006

All Science Journal Classification (ASJC) codes

Nuclear and High Energy Physics
Condensed Matter Physics

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@article{1a5f3fc607ff4857a5851e0fd6b4bc64,

title = "Quantitative density fluctuation measurements utilizing quadrature reflectometers on DIII-D",

abstract = "Fixed-frequency reflectometers utilizing quadrature phase detection are employed on DIII-D to study both coherent and turbulent density fluctuations. For coherent fluctuations, the reconstructed phase information successfully identifies MHD/coherent mode activity, e.g. tearing modes, compressional Alfv{\'e}n eigenmodes, etc. For an m ≤ 3/n ≤ 2 tearing mode, a basic 1D phase screen model is applied to infer fluctuation levels, and the result is consistent with the beam emission spectroscopy (BES) measurement. For turbulent fluctuation studies, a 2D full-wave code (Valeo E.J., Kramer G.J. and Nazikian R. 2002 Plasma Phys. Control. Fusion 44 L1) is applied to interpret reflectometry data obtained in the H-mode edge pedestal region to deduce density fluctuation levels. The measurement is simulated using realistic geometry, plasma conditions and antenna patterns. Comparison of the fluctuation level deduced from the 2D code with BES measurement shows reasonable agreement.",

author = "G. Wang and Peebles, \{W. A.\} and Rhodes, \{T. L.\} and Kramer, \{G. J.\} and Doyle, \{E. J.\} and McKee, \{G. R.\} and R. Nazikian and Crocker, \{N. A.\} and X. Nguyen and L. Zeng and S. Kubota and VanZeeland, \{M. A.\}",

year = "2006",

month = sep,

day = "1",

doi = "10.1088/0029-5515/46/9/S06",

language = "English (US)",

volume = "46",

pages = "S708--S713",

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T1 - Quantitative density fluctuation measurements utilizing quadrature reflectometers on DIII-D

AU - Wang, G.

AU - Peebles, W. A.

AU - Rhodes, T. L.

AU - Kramer, G. J.

AU - Doyle, E. J.

AU - McKee, G. R.

AU - Nazikian, R.

AU - Crocker, N. A.

AU - Nguyen, X.

AU - Zeng, L.

AU - Kubota, S.

AU - VanZeeland, M. A.

PY - 2006/9/1

Y1 - 2006/9/1

N2 - Fixed-frequency reflectometers utilizing quadrature phase detection are employed on DIII-D to study both coherent and turbulent density fluctuations. For coherent fluctuations, the reconstructed phase information successfully identifies MHD/coherent mode activity, e.g. tearing modes, compressional Alfvén eigenmodes, etc. For an m ≤ 3/n ≤ 2 tearing mode, a basic 1D phase screen model is applied to infer fluctuation levels, and the result is consistent with the beam emission spectroscopy (BES) measurement. For turbulent fluctuation studies, a 2D full-wave code (Valeo E.J., Kramer G.J. and Nazikian R. 2002 Plasma Phys. Control. Fusion 44 L1) is applied to interpret reflectometry data obtained in the H-mode edge pedestal region to deduce density fluctuation levels. The measurement is simulated using realistic geometry, plasma conditions and antenna patterns. Comparison of the fluctuation level deduced from the 2D code with BES measurement shows reasonable agreement.

AB - Fixed-frequency reflectometers utilizing quadrature phase detection are employed on DIII-D to study both coherent and turbulent density fluctuations. For coherent fluctuations, the reconstructed phase information successfully identifies MHD/coherent mode activity, e.g. tearing modes, compressional Alfvén eigenmodes, etc. For an m ≤ 3/n ≤ 2 tearing mode, a basic 1D phase screen model is applied to infer fluctuation levels, and the result is consistent with the beam emission spectroscopy (BES) measurement. For turbulent fluctuation studies, a 2D full-wave code (Valeo E.J., Kramer G.J. and Nazikian R. 2002 Plasma Phys. Control. Fusion 44 L1) is applied to interpret reflectometry data obtained in the H-mode edge pedestal region to deduce density fluctuation levels. The measurement is simulated using realistic geometry, plasma conditions and antenna patterns. Comparison of the fluctuation level deduced from the 2D code with BES measurement shows reasonable agreement.

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SN - 0029-5515

VL - 46

SP - S708-S713

JO - Nuclear Fusion

JF - Nuclear Fusion

IS - 9

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ER -

Quantitative density fluctuation measurements utilizing quadrature reflectometers on DIII-D

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