Predict-first experiments and modeling of perturbative cold pulses in the DIII-D tokamak

P. Rodriguez-Fernandez; A. E. White; N. T. Howard; B. A. Grierson; L. Zeng; X. Yuan; G. M. Staebler; M. E. Austin; T. Odstrcil; T. L. Rhodes; F. Sciortino; J. E. Rice; K. E. Thome; C. Angioni; E. Fable; O. Meneghini

doi:10.1063/1.5096800

Predict-first experiments and modeling of perturbative cold pulses in the DIII-D tokamak

P. Rodriguez-Fernandez, A. E. White, N. T. Howard, B. A. Grierson, L. Zeng, X. Yuan, G. M. Staebler, M. E. Austin, T. Odstrcil, T. L. Rhodes, F. Sciortino, J. E. Rice, K. E. Thome, C. Angioni, E. Fable, O. Meneghini

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Abstract

Cold pulses are introduced in Ohmic DIII-D tokamak plasmas via injection of impurities with a laser blow-off system, revealing for the first time in this machine a quick increase in core electron temperature shortly after the edge cold-pulse injection at low collisionality. The experimental results are consistent with predict-first simulations of heat transport enabled by the Trapped Gyro-Landau-Fluid transport model. Measurements of electron density evolution during the cold-pulse propagation are enabled by a high time resolution density profile reflectometer. The density evolution reveals the quick propagation of a pulse from edge to core, which is a mechanism to transiently increase core temperature in low-collisionality plasmas. Local transport simulations with measured density evolution demonstrate that the core temperature response can indeed be explained by the stabilization of Trapped Electron Mode turbulence at low collisionality, thus providing confidence that local transport modeling is enough to explain cold-pulse propagation and associated phenomenology.

Original language	English
Article number	062503
Journal	Physics of Plasmas
Volume	26
Issue number	6
DOIs	https://doi.org/10.1063/1.5096800
State	Published - Jun 1 2019
Externally published	Yes

Funding

The authors appreciate insightful discussions with Dr. Mantica, Professor Gentle, and Dr. Citrin on the dynamics of cold-pulse propagation in tokamak plasmas. We thank Dr. Osborne and the DIII-D team for their excellent work on the experiments, and the TRANSP team for their support with the intensive runs. Data analysis was performed using the OMFIT framework.51,52,71 This material is based upon work supported by the U.S. Department of Energy, Office of Science, Office of Fusion Energy Sciences, using the DIII-D National Fusion Facility, a DOE Office of Science user facility, under Award Nos. DE-FC02-04ER54698, DE-SC0014264, DE-AC02-09CH11466, DE-FG02-97ER54415, DE-SC0019352, and DE-FG02-08ER54984. P.R.F. was also supported by Fundación Bancaria “la Caixa” under Award No. LCF/BQ/AN14/10340041. DIII-D data shown in this paper can be obtained in digital format by following the links at https://fusion.gat.com/global/D3D_DMP.

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Rodriguez-Fernandez, P., White, A. E., Howard, N. T., Grierson, B. A., Zeng, L., Yuan, X., Staebler, G. M., Austin, M. E., Odstrcil, T., Rhodes, T. L., Sciortino, F., Rice, J. E., Thome, K. E., Angioni, C., Fable, E., & Meneghini, O. (2019). Predict-first experiments and modeling of perturbative cold pulses in the DIII-D tokamak. Physics of Plasmas, 26(6), Article 062503. https://doi.org/10.1063/1.5096800

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title = "Predict-first experiments and modeling of perturbative cold pulses in the DIII-D tokamak",

abstract = "Cold pulses are introduced in Ohmic DIII-D tokamak plasmas via injection of impurities with a laser blow-off system, revealing for the first time in this machine a quick increase in core electron temperature shortly after the edge cold-pulse injection at low collisionality. The experimental results are consistent with predict-first simulations of heat transport enabled by the Trapped Gyro-Landau-Fluid transport model. Measurements of electron density evolution during the cold-pulse propagation are enabled by a high time resolution density profile reflectometer. The density evolution reveals the quick propagation of a pulse from edge to core, which is a mechanism to transiently increase core temperature in low-collisionality plasmas. Local transport simulations with measured density evolution demonstrate that the core temperature response can indeed be explained by the stabilization of Trapped Electron Mode turbulence at low collisionality, thus providing confidence that local transport modeling is enough to explain cold-pulse propagation and associated phenomenology.",

author = "P. Rodriguez-Fernandez and White, {A. E.} and Howard, {N. T.} and Grierson, {B. A.} and L. Zeng and X. Yuan and Staebler, {G. M.} and Austin, {M. E.} and T. Odstrcil and Rhodes, {T. L.} and F. Sciortino and Rice, {J. E.} and Thome, {K. E.} and C. Angioni and E. Fable and O. Meneghini",

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Rodriguez-Fernandez, P, White, AE, Howard, NT, Grierson, BA, Zeng, L, Yuan, X, Staebler, GM, Austin, ME, Odstrcil, T, Rhodes, TL, Sciortino, F, Rice, JE, Thome, KE, Angioni, C, Fable, E & Meneghini, O 2019, 'Predict-first experiments and modeling of perturbative cold pulses in the DIII-D tokamak', Physics of Plasmas, vol. 26, no. 6, 062503. https://doi.org/10.1063/1.5096800

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T1 - Predict-first experiments and modeling of perturbative cold pulses in the DIII-D tokamak

AU - Rodriguez-Fernandez, P.

AU - White, A. E.

AU - Howard, N. T.

AU - Grierson, B. A.

AU - Zeng, L.

AU - Yuan, X.

AU - Staebler, G. M.

AU - Austin, M. E.

AU - Odstrcil, T.

AU - Rhodes, T. L.

AU - Sciortino, F.

AU - Rice, J. E.

AU - Thome, K. E.

AU - Angioni, C.

AU - Fable, E.

AU - Meneghini, O.

PY - 2019/6/1

Y1 - 2019/6/1

N2 - Cold pulses are introduced in Ohmic DIII-D tokamak plasmas via injection of impurities with a laser blow-off system, revealing for the first time in this machine a quick increase in core electron temperature shortly after the edge cold-pulse injection at low collisionality. The experimental results are consistent with predict-first simulations of heat transport enabled by the Trapped Gyro-Landau-Fluid transport model. Measurements of electron density evolution during the cold-pulse propagation are enabled by a high time resolution density profile reflectometer. The density evolution reveals the quick propagation of a pulse from edge to core, which is a mechanism to transiently increase core temperature in low-collisionality plasmas. Local transport simulations with measured density evolution demonstrate that the core temperature response can indeed be explained by the stabilization of Trapped Electron Mode turbulence at low collisionality, thus providing confidence that local transport modeling is enough to explain cold-pulse propagation and associated phenomenology.

AB - Cold pulses are introduced in Ohmic DIII-D tokamak plasmas via injection of impurities with a laser blow-off system, revealing for the first time in this machine a quick increase in core electron temperature shortly after the edge cold-pulse injection at low collisionality. The experimental results are consistent with predict-first simulations of heat transport enabled by the Trapped Gyro-Landau-Fluid transport model. Measurements of electron density evolution during the cold-pulse propagation are enabled by a high time resolution density profile reflectometer. The density evolution reveals the quick propagation of a pulse from edge to core, which is a mechanism to transiently increase core temperature in low-collisionality plasmas. Local transport simulations with measured density evolution demonstrate that the core temperature response can indeed be explained by the stabilization of Trapped Electron Mode turbulence at low collisionality, thus providing confidence that local transport modeling is enough to explain cold-pulse propagation and associated phenomenology.

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Predict-first experiments and modeling of perturbative cold pulses in the DIII-D tokamak

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