On the application of electron cyclotron emission imaging to the validation of theoretical models of magnetohydrodynamic activity

B. J. Tobias; R. L. Boivin; J. E. Boom; I. G.J. Classen; C. W. Domier; A. J.H. Donné; W. W. Heidbrink; N. C. Luhmann; T. Munsat; C. M. Muscatello; R. Nazikian; H. K. Park; D. A. Spong; A. D. Turnbull; M. A. Van Zeeland; G. S. Yun

doi:10.1063/1.3563572

On the application of electron cyclotron emission imaging to the validation of theoretical models of magnetohydrodynamic activity

B. J. Tobias, R. L. Boivin, J. E. Boom, I. G.J. Classen, C. W. Domier, A. J.H. Donné, W. W. Heidbrink, N. C. Luhmann, T. Munsat, C. M. Muscatello, R. Nazikian, H. K. Park, D. A. Spong, A. D. Turnbull, M. A. Van Zeeland, G. S. Yun

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Abstract

Two-dimensional (2D) imaging of electron temperature perturbations provides a powerful constraint for validating theoretical models describing magnetohydrodynamic plasma behavior. In observation of Alfvén wave induced temperature fluctuations, electron cyclotron emission imaging provides unambiguous determination of the 2D eigenmode structure. This has provided support for nonperturbative eigenmode solvers which predict symmetry breaking due to poloidal flows in the fast ion population. It is shown that for Alfvén eigenmodes, and in cases where convective flows or saturated perturbations lead to nonaxisymmetric equilibria, electron plasma displacements oriented parallel to a gradient in mean temperature are well defined. Furthermore, during highly dynamic behavior, such as the sawtooth crash, highly resolved 2D temperature behaviors yield valuable insight. In particular, addressing the role of adiabatic heating on time scales much shorter than the resistive diffusion time through the additional diagnosis of local electron density allows progress to be made toward a comprehensive understanding of fast reconnection in tokamak plasmas.

Original language	English
Article number	056107
Journal	Physics of Plasmas
Volume	18
Issue number	5
DOIs	https://doi.org/10.1063/1.3563572
State	Published - May 2011

Funding

This work was supported in part by the U.S. Department of Energy. This work was also supported by NWO, POSTECH, and the Association EURATOM-FOM. In addition, the authors are immensely grateful to all members of the UC Davis Plasma Diagnostics Group, PPPL engineering support, and the DIII-D team, without whose tireless work this project would not have been possible.

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Tobias, B. J., Boivin, R. L., Boom, J. E., Classen, I. G. J., Domier, C. W., Donné, A. J. H., Heidbrink, W. W., Luhmann, N. C., Munsat, T., Muscatello, C. M., Nazikian, R., Park, H. K., Spong, D. A., Turnbull, A. D., Van Zeeland, M. A., & Yun, G. S. (2011). On the application of electron cyclotron emission imaging to the validation of theoretical models of magnetohydrodynamic activity. Physics of Plasmas, 18(5), Article 056107. https://doi.org/10.1063/1.3563572

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title = "On the application of electron cyclotron emission imaging to the validation of theoretical models of magnetohydrodynamic activity",

abstract = "Two-dimensional (2D) imaging of electron temperature perturbations provides a powerful constraint for validating theoretical models describing magnetohydrodynamic plasma behavior. In observation of Alfv{\'e}n wave induced temperature fluctuations, electron cyclotron emission imaging provides unambiguous determination of the 2D eigenmode structure. This has provided support for nonperturbative eigenmode solvers which predict symmetry breaking due to poloidal flows in the fast ion population. It is shown that for Alfv{\'e}n eigenmodes, and in cases where convective flows or saturated perturbations lead to nonaxisymmetric equilibria, electron plasma displacements oriented parallel to a gradient in mean temperature are well defined. Furthermore, during highly dynamic behavior, such as the sawtooth crash, highly resolved 2D temperature behaviors yield valuable insight. In particular, addressing the role of adiabatic heating on time scales much shorter than the resistive diffusion time through the additional diagnosis of local electron density allows progress to be made toward a comprehensive understanding of fast reconnection in tokamak plasmas.",

author = "Tobias, {B. J.} and Boivin, {R. L.} and Boom, {J. E.} and Classen, {I. G.J.} and Domier, {C. W.} and Donn{\'e}, {A. J.H.} and Heidbrink, {W. W.} and Luhmann, {N. C.} and T. Munsat and Muscatello, {C. M.} and R. Nazikian and Park, {H. K.} and Spong, {D. A.} and Turnbull, {A. D.} and {Van Zeeland}, {M. A.} and Yun, {G. S.}",

year = "2011",

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Tobias, BJ, Boivin, RL, Boom, JE, Classen, IGJ, Domier, CW, Donné, AJH, Heidbrink, WW, Luhmann, NC, Munsat, T, Muscatello, CM, Nazikian, R, Park, HK, Spong, DA, Turnbull, AD, Van Zeeland, MA & Yun, GS 2011, 'On the application of electron cyclotron emission imaging to the validation of theoretical models of magnetohydrodynamic activity', Physics of Plasmas, vol. 18, no. 5, 056107. https://doi.org/10.1063/1.3563572

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AU - Munsat, T.

AU - Muscatello, C. M.

AU - Nazikian, R.

AU - Park, H. K.

AU - Spong, D. A.

AU - Turnbull, A. D.

AU - Van Zeeland, M. A.

AU - Yun, G. S.

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N2 - Two-dimensional (2D) imaging of electron temperature perturbations provides a powerful constraint for validating theoretical models describing magnetohydrodynamic plasma behavior. In observation of Alfvén wave induced temperature fluctuations, electron cyclotron emission imaging provides unambiguous determination of the 2D eigenmode structure. This has provided support for nonperturbative eigenmode solvers which predict symmetry breaking due to poloidal flows in the fast ion population. It is shown that for Alfvén eigenmodes, and in cases where convective flows or saturated perturbations lead to nonaxisymmetric equilibria, electron plasma displacements oriented parallel to a gradient in mean temperature are well defined. Furthermore, during highly dynamic behavior, such as the sawtooth crash, highly resolved 2D temperature behaviors yield valuable insight. In particular, addressing the role of adiabatic heating on time scales much shorter than the resistive diffusion time through the additional diagnosis of local electron density allows progress to be made toward a comprehensive understanding of fast reconnection in tokamak plasmas.

AB - Two-dimensional (2D) imaging of electron temperature perturbations provides a powerful constraint for validating theoretical models describing magnetohydrodynamic plasma behavior. In observation of Alfvén wave induced temperature fluctuations, electron cyclotron emission imaging provides unambiguous determination of the 2D eigenmode structure. This has provided support for nonperturbative eigenmode solvers which predict symmetry breaking due to poloidal flows in the fast ion population. It is shown that for Alfvén eigenmodes, and in cases where convective flows or saturated perturbations lead to nonaxisymmetric equilibria, electron plasma displacements oriented parallel to a gradient in mean temperature are well defined. Furthermore, during highly dynamic behavior, such as the sawtooth crash, highly resolved 2D temperature behaviors yield valuable insight. In particular, addressing the role of adiabatic heating on time scales much shorter than the resistive diffusion time through the additional diagnosis of local electron density allows progress to be made toward a comprehensive understanding of fast reconnection in tokamak plasmas.

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On the application of electron cyclotron emission imaging to the validation of theoretical models of magnetohydrodynamic activity

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