Active feedback stabilization of the resistive wall mode on the DIII-D device

M. Okabayashi; J. Bialek; M. S. Chance; M. S. Chu; E. D. Fredrickson; A. M. Garofalo; M. Gryaznevich; R. E. Hatcher; T. H. Jensen; L. C. Johnson; R. J. La Haye; E. A. Lazarus; M. A. Makowski; J. Manickam; G. A. Navratil; J. T. Scoville; E. J. Strait; A. D. Turnbull; M. L. Walker

doi:10.1063/1.1351823

Active feedback stabilization of the resistive wall mode on the DIII-D device

M. Okabayashi, J. Bialek, M. S. Chance, M. S. Chu, E. D. Fredrickson, A. M. Garofalo, M. Gryaznevich, R. E. Hatcher, T. H. Jensen, L. C. Johnson, R. J. La Haye, E. A. Lazarus, M. A. Makowski, J. Manickam, G. A. Navratil, J. T. Scoville, E. J. Strait, A. D. Turnbull, M. L. Walker

Institute of Space and Plasma Sciences

Research output: Contribution to journal › Conference article › peer-review

119 Citations (Scopus)

Abstract

A proof of principle magnetic feedback stabilization experiment has been carried out to suppress the resistive wall mode (RWM), a branch of the ideal magnetohydrodynamic (MHD) kink mode under the influence of a stabilizing resistive wall, on the DIII-D tokamak device [Plasma Phys. Controlled Fusion Research (International Atomic Energy Agency, Vienna, 1986), p. 159; Phys. Plasmas 1, 1415 (1994)]. The RWM was successfully suppressed and the high beta duration above the no-wall limit was extended to more than 50 times the resistive wall flux diffusion time. It was observed that the mode structure was well preserved during the time of the feedback application. Several lumped parameter formulations were used to study the feedback process. The observed feedback characteristics are in good qualitative agreement with the analysis. These results provide encouragement to future efforts towards optimizing the RWM feedback methodology in parallel to what has been successfully developed for the n = 0 vertical positional control. Newly developed MHD codes have been extremely useful in guiding the experiments and in providing possible paths for the next step.

Original language	English
Pages (from-to)	2071-2082
Number of pages	12
Journal	Physics of Plasmas
Volume	8
Issue number	5 II
DOIs	https://doi.org/10.1063/1.1351823
Publication status	Published - 2001 May
Event	42nd Annual Meeting of the APS Division of Plasma Physics - Quebec, Que, Canada Duration: 2000 Oct 23 → 2000 Oct 27

All Science Journal Classification (ASJC) codes

Condensed Matter Physics

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10.1063/1.1351823

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Okabayashi, M., Bialek, J., Chance, M. S., Chu, M. S., Fredrickson, E. D., Garofalo, A. M., Gryaznevich, M., Hatcher, R. E., Jensen, T. H., Johnson, L. C., La Haye, R. J., Lazarus, E. A., Makowski, M. A., Manickam, J., Navratil, G. A., Scoville, J. T., Strait, E. J., Turnbull, A. D., & Walker, M. L. (2001). Active feedback stabilization of the resistive wall mode on the DIII-D device. Physics of Plasmas, 8(5 II), 2071-2082. https://doi.org/10.1063/1.1351823

@article{76ff5a18ee344963a669e8c8e78a4952,

title = "Active feedback stabilization of the resistive wall mode on the DIII-D device",

abstract = "A proof of principle magnetic feedback stabilization experiment has been carried out to suppress the resistive wall mode (RWM), a branch of the ideal magnetohydrodynamic (MHD) kink mode under the influence of a stabilizing resistive wall, on the DIII-D tokamak device [Plasma Phys. Controlled Fusion Research (International Atomic Energy Agency, Vienna, 1986), p. 159; Phys. Plasmas 1, 1415 (1994)]. The RWM was successfully suppressed and the high beta duration above the no-wall limit was extended to more than 50 times the resistive wall flux diffusion time. It was observed that the mode structure was well preserved during the time of the feedback application. Several lumped parameter formulations were used to study the feedback process. The observed feedback characteristics are in good qualitative agreement with the analysis. These results provide encouragement to future efforts towards optimizing the RWM feedback methodology in parallel to what has been successfully developed for the n = 0 vertical positional control. Newly developed MHD codes have been extremely useful in guiding the experiments and in providing possible paths for the next step.",

author = "M. Okabayashi and J. Bialek and Chance, {M. S.} and Chu, {M. S.} and Fredrickson, {E. D.} and Garofalo, {A. M.} and M. Gryaznevich and Hatcher, {R. E.} and Jensen, {T. H.} and Johnson, {L. C.} and {La Haye}, {R. J.} and Lazarus, {E. A.} and Makowski, {M. A.} and J. Manickam and Navratil, {G. A.} and Scoville, {J. T.} and Strait, {E. J.} and Turnbull, {A. D.} and Walker, {M. L.}",

year = "2001",

month = may,

doi = "10.1063/1.1351823",

language = "English",

volume = "8",

pages = "2071--2082",

journal = "Physics of Plasmas",

issn = "1070-664X",

publisher = "American Institute of Physics Publising LLC",

number = "5 II",

note = "42nd Annual Meeting of the APS Division of Plasma Physics ; Conference date: 23-10-2000 Through 27-10-2000",

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Okabayashi, M, Bialek, J, Chance, MS, Chu, MS, Fredrickson, ED, Garofalo, AM, Gryaznevich, M, Hatcher, RE, Jensen, TH, Johnson, LC, La Haye, RJ, Lazarus, EA, Makowski, MA, Manickam, J, Navratil, GA, Scoville, JT, Strait, EJ, Turnbull, AD & Walker, ML 2001, 'Active feedback stabilization of the resistive wall mode on the DIII-D device', Physics of Plasmas, vol. 8, no. 5 II, pp. 2071-2082. https://doi.org/10.1063/1.1351823

TY - JOUR

T1 - Active feedback stabilization of the resistive wall mode on the DIII-D device

AU - Okabayashi, M.

AU - Bialek, J.

AU - Chance, M. S.

AU - Chu, M. S.

AU - Fredrickson, E. D.

AU - Garofalo, A. M.

AU - Gryaznevich, M.

AU - Hatcher, R. E.

AU - Jensen, T. H.

AU - Johnson, L. C.

AU - La Haye, R. J.

AU - Lazarus, E. A.

AU - Makowski, M. A.

AU - Manickam, J.

AU - Navratil, G. A.

AU - Scoville, J. T.

AU - Strait, E. J.

AU - Turnbull, A. D.

AU - Walker, M. L.

PY - 2001/5

Y1 - 2001/5

N2 - A proof of principle magnetic feedback stabilization experiment has been carried out to suppress the resistive wall mode (RWM), a branch of the ideal magnetohydrodynamic (MHD) kink mode under the influence of a stabilizing resistive wall, on the DIII-D tokamak device [Plasma Phys. Controlled Fusion Research (International Atomic Energy Agency, Vienna, 1986), p. 159; Phys. Plasmas 1, 1415 (1994)]. The RWM was successfully suppressed and the high beta duration above the no-wall limit was extended to more than 50 times the resistive wall flux diffusion time. It was observed that the mode structure was well preserved during the time of the feedback application. Several lumped parameter formulations were used to study the feedback process. The observed feedback characteristics are in good qualitative agreement with the analysis. These results provide encouragement to future efforts towards optimizing the RWM feedback methodology in parallel to what has been successfully developed for the n = 0 vertical positional control. Newly developed MHD codes have been extremely useful in guiding the experiments and in providing possible paths for the next step.

AB - A proof of principle magnetic feedback stabilization experiment has been carried out to suppress the resistive wall mode (RWM), a branch of the ideal magnetohydrodynamic (MHD) kink mode under the influence of a stabilizing resistive wall, on the DIII-D tokamak device [Plasma Phys. Controlled Fusion Research (International Atomic Energy Agency, Vienna, 1986), p. 159; Phys. Plasmas 1, 1415 (1994)]. The RWM was successfully suppressed and the high beta duration above the no-wall limit was extended to more than 50 times the resistive wall flux diffusion time. It was observed that the mode structure was well preserved during the time of the feedback application. Several lumped parameter formulations were used to study the feedback process. The observed feedback characteristics are in good qualitative agreement with the analysis. These results provide encouragement to future efforts towards optimizing the RWM feedback methodology in parallel to what has been successfully developed for the n = 0 vertical positional control. Newly developed MHD codes have been extremely useful in guiding the experiments and in providing possible paths for the next step.

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U2 - 10.1063/1.1351823

DO - 10.1063/1.1351823

M3 - Conference article

AN - SCOPUS:6644228711

SN - 1070-664X

VL - 8

SP - 2071

EP - 2082

JO - Physics of Plasmas

JF - Physics of Plasmas

IS - 5 II

T2 - 42nd Annual Meeting of the APS Division of Plasma Physics

Y2 - 23 October 2000 through 27 October 2000

ER -

Active feedback stabilization of the resistive wall mode on the DIII-D device

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