Observation of edge instability limiting the pedestal growth in Tokamak plasmas

A. Diallo; J. W. Hughes; M. Greenwald; B. Labombard; E. Davis; S. G. Baek; C. Theiler; P. Snyder; J. Canik; J. Walk; T. Golfinopoulos; J. Terry; M. Churchill; A. Hubbard; M. Porkolab; L. Delgado-Aparicio; M. L. Reinke; A. White

doi:10.1103/PhysRevLett.112.115001

Observation of edge instability limiting the pedestal growth in Tokamak plasmas

A. Diallo, J. W. Hughes, M. Greenwald, B. Labombard, E. Davis, S. G. Baek, C. Theiler, P. Snyder, J. Canik, J. Walk, T. Golfinopoulos, J. Terry, M. Churchill, A. Hubbard, M. Porkolab, L. Delgado-Aparicio, M. L. Reinke, A. White

Fusion Energy Division

Research output: Contribution to journal › Article › peer-review

82 Scopus citations

Abstract

With fusion device performance hinging on the edge pedestal pressure, it is imperative to experimentally understand the physical mechanism dictating the pedestal characteristics and to validate and improve pedestal predictive models. This Letter reports direct evidence of density and magnetic fluctuations showing the stiff onset of an edge instability leading to the saturation of the pedestal on the Alcator C-Mod tokamak. Edge stability analyses indicate that the pedestal is unstable to both ballooning mode and kinetic ballooning mode in agreement with observations.

Original language	English
Article number	115001
Journal	Physical Review Letters
Volume	112
Issue number	11
DOIs	https://doi.org/10.1103/PhysRevLett.112.115001
State	Published - Mar 17 2014

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Diallo, A., Hughes, J. W., Greenwald, M., Labombard, B., Davis, E., Baek, S. G., Theiler, C., Snyder, P., Canik, J., Walk, J., Golfinopoulos, T., Terry, J., Churchill, M., Hubbard, A., Porkolab, M., Delgado-Aparicio, L., Reinke, M. L., & White, A. (2014). Observation of edge instability limiting the pedestal growth in Tokamak plasmas. Physical Review Letters, 112(11), Article 115001. https://doi.org/10.1103/PhysRevLett.112.115001

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abstract = "With fusion device performance hinging on the edge pedestal pressure, it is imperative to experimentally understand the physical mechanism dictating the pedestal characteristics and to validate and improve pedestal predictive models. This Letter reports direct evidence of density and magnetic fluctuations showing the stiff onset of an edge instability leading to the saturation of the pedestal on the Alcator C-Mod tokamak. Edge stability analyses indicate that the pedestal is unstable to both ballooning mode and kinetic ballooning mode in agreement with observations.",

author = "A. Diallo and Hughes, {J. W.} and M. Greenwald and B. Labombard and E. Davis and Baek, {S. G.} and C. Theiler and P. Snyder and J. Canik and J. Walk and T. Golfinopoulos and J. Terry and M. Churchill and A. Hubbard and M. Porkolab and L. Delgado-Aparicio and Reinke, {M. L.} and A. White",

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Diallo, A, Hughes, JW, Greenwald, M, Labombard, B, Davis, E, Baek, SG, Theiler, C, Snyder, P, Canik, J, Walk, J, Golfinopoulos, T, Terry, J, Churchill, M, Hubbard, A, Porkolab, M, Delgado-Aparicio, L, Reinke, ML & White, A 2014, 'Observation of edge instability limiting the pedestal growth in Tokamak plasmas', Physical Review Letters, vol. 112, no. 11, 115001. https://doi.org/10.1103/PhysRevLett.112.115001

TY - JOUR

T1 - Observation of edge instability limiting the pedestal growth in Tokamak plasmas

AU - Diallo, A.

AU - Hughes, J. W.

AU - Greenwald, M.

AU - Labombard, B.

AU - Davis, E.

AU - Baek, S. G.

AU - Theiler, C.

AU - Snyder, P.

AU - Canik, J.

AU - Walk, J.

AU - Golfinopoulos, T.

AU - Terry, J.

AU - Churchill, M.

AU - Hubbard, A.

AU - Porkolab, M.

AU - Delgado-Aparicio, L.

AU - Reinke, M. L.

AU - White, A.

PY - 2014/3/17

Y1 - 2014/3/17

N2 - With fusion device performance hinging on the edge pedestal pressure, it is imperative to experimentally understand the physical mechanism dictating the pedestal characteristics and to validate and improve pedestal predictive models. This Letter reports direct evidence of density and magnetic fluctuations showing the stiff onset of an edge instability leading to the saturation of the pedestal on the Alcator C-Mod tokamak. Edge stability analyses indicate that the pedestal is unstable to both ballooning mode and kinetic ballooning mode in agreement with observations.

AB - With fusion device performance hinging on the edge pedestal pressure, it is imperative to experimentally understand the physical mechanism dictating the pedestal characteristics and to validate and improve pedestal predictive models. This Letter reports direct evidence of density and magnetic fluctuations showing the stiff onset of an edge instability leading to the saturation of the pedestal on the Alcator C-Mod tokamak. Edge stability analyses indicate that the pedestal is unstable to both ballooning mode and kinetic ballooning mode in agreement with observations.

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DO - 10.1103/PhysRevLett.112.115001

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SN - 0031-9007

VL - 112

JO - Physical Review Letters

JF - Physical Review Letters

IS - 11

M1 - 115001

ER -

Observation of edge instability limiting the pedestal growth in Tokamak plasmas

Abstract

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