Explaining Cold-Pulse Dynamics in Tokamak Plasmas Using Local Turbulent Transport Models

P. Rodriguez-Fernandez; A. E. White; N. T. Howard; B. A. Grierson; G. M. Staebler; J. E. Rice; X. Yuan; N. M. Cao; A. J. Creely; M. J. Greenwald; A. E. Hubbard; J. W. Hughes; J. H. Irby; F. Sciortino

doi:10.1103/PhysRevLett.120.075001

Explaining Cold-Pulse Dynamics in Tokamak Plasmas Using Local Turbulent Transport Models

P. Rodriguez-Fernandez, A. E. White, N. T. Howard, B. A. Grierson, G. M. Staebler, J. E. Rice, X. Yuan, N. M. Cao, A. J. Creely, M. J. Greenwald, A. E. Hubbard, J. W. Hughes, J. H. Irby, F. Sciortino

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Abstract

A long-standing enigma in plasma transport has been resolved by modeling of cold-pulse experiments conducted on the Alcator C-Mod tokamak. Controlled edge cooling of fusion plasmas triggers core electron heating on time scales faster than an energy confinement time, which has long been interpreted as strong evidence of nonlocal transport. This Letter shows that the steady-state profiles, the cold-pulse rise time, and disappearance at higher density as measured in these experiments are successfully captured by a recent local quasilinear turbulent transport model, demonstrating that the existence of nonlocal transport phenomena is not necessary for explaining the behavior and time scales of cold-pulse experiments in tokamak plasmas.

Original language	English
Article number	075001
Journal	Physical Review Letters
Volume	120
Issue number	7
DOIs	https://doi.org/10.1103/PhysRevLett.120.075001
State	Published - Feb 16 2018
Externally published	Yes

Funding

The authors thank the Alcator C-Mod team for their excellent work on these experiments and the transp team for their support with the intensive runs. Data analysis was performed using the OMFIT framework . This work was supported by U.S. Department of Energy Award No. DE-FC02-99ER54512, using Alcator C-Mod, a DOE Office of Science User Facility. P. R. F. was also supported by U.S. Department of Energy Award No. DE-SC0014264 and a La Caixa Fellowship.

Funders	Funder number
U.S. Department of Energy	DE-FC02-99ER54512
Office of Science	DE-SC0014264

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10.1103/PhysRevLett.120.075001

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Rodriguez-Fernandez, P., White, A. E., Howard, N. T., Grierson, B. A., Staebler, G. M., Rice, J. E., Yuan, X., Cao, N. M., Creely, A. J., Greenwald, M. J., Hubbard, A. E., Hughes, J. W., Irby, J. H., & Sciortino, F. (2018). Explaining Cold-Pulse Dynamics in Tokamak Plasmas Using Local Turbulent Transport Models. Physical Review Letters, 120(7), Article 075001. https://doi.org/10.1103/PhysRevLett.120.075001

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title = "Explaining Cold-Pulse Dynamics in Tokamak Plasmas Using Local Turbulent Transport Models",

abstract = "A long-standing enigma in plasma transport has been resolved by modeling of cold-pulse experiments conducted on the Alcator C-Mod tokamak. Controlled edge cooling of fusion plasmas triggers core electron heating on time scales faster than an energy confinement time, which has long been interpreted as strong evidence of nonlocal transport. This Letter shows that the steady-state profiles, the cold-pulse rise time, and disappearance at higher density as measured in these experiments are successfully captured by a recent local quasilinear turbulent transport model, demonstrating that the existence of nonlocal transport phenomena is not necessary for explaining the behavior and time scales of cold-pulse experiments in tokamak plasmas.",

author = "P. Rodriguez-Fernandez and White, {A. E.} and Howard, {N. T.} and Grierson, {B. A.} and Staebler, {G. M.} and Rice, {J. E.} and X. Yuan and Cao, {N. M.} and Creely, {A. J.} and Greenwald, {M. J.} and Hubbard, {A. E.} and Hughes, {J. W.} and Irby, {J. H.} and F. Sciortino",

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doi = "10.1103/PhysRevLett.120.075001",

language = "English",

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Rodriguez-Fernandez, P, White, AE, Howard, NT, Grierson, BA, Staebler, GM, Rice, JE, Yuan, X, Cao, NM, Creely, AJ, Greenwald, MJ, Hubbard, AE, Hughes, JW, Irby, JH & Sciortino, F 2018, 'Explaining Cold-Pulse Dynamics in Tokamak Plasmas Using Local Turbulent Transport Models', Physical Review Letters, vol. 120, no. 7, 075001. https://doi.org/10.1103/PhysRevLett.120.075001

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AU - Rodriguez-Fernandez, P.

AU - White, A. E.

AU - Howard, N. T.

AU - Grierson, B. A.

AU - Staebler, G. M.

AU - Rice, J. E.

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AU - Cao, N. M.

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AU - Greenwald, M. J.

AU - Hubbard, A. E.

AU - Hughes, J. W.

AU - Irby, J. H.

AU - Sciortino, F.

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AB - A long-standing enigma in plasma transport has been resolved by modeling of cold-pulse experiments conducted on the Alcator C-Mod tokamak. Controlled edge cooling of fusion plasmas triggers core electron heating on time scales faster than an energy confinement time, which has long been interpreted as strong evidence of nonlocal transport. This Letter shows that the steady-state profiles, the cold-pulse rise time, and disappearance at higher density as measured in these experiments are successfully captured by a recent local quasilinear turbulent transport model, demonstrating that the existence of nonlocal transport phenomena is not necessary for explaining the behavior and time scales of cold-pulse experiments in tokamak plasmas.

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Explaining Cold-Pulse Dynamics in Tokamak Plasmas Using Local Turbulent Transport Models

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