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

Abstract

Cold pulses are presented 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, hence providing confidence that local transport modeling is enough to explain cold-pulse propagation and associated phenomenology.

Authors:
ORCiD logo [1];  [1]; ORCiD logo [1]; ORCiD logo [2]; ORCiD logo [3];  [2]; ORCiD logo [4]; ORCiD logo [5]; ORCiD logo [1];  [3];  [1]; ORCiD logo [1]; ORCiD logo [4]; ORCiD logo [6];  [6];  [4]
  1. Massachusetts Inst. of Technology (MIT), Cambridge, MA (United States)
  2. Princeton Plasma Physics Lab. (PPPL), Princeton, NJ (United States)
  3. Univ. of California, Los Angeles, CA (United States)
  4. General Atomics, San Diego, CA (United States)
  5. Univ. of Texas, Austin, TX (United States)
  6. Max Planck Institut für Plasmaphysik, Garching (Germany)
Publication Date:
Research Org.:
Princeton Plasma Physics Lab. (PPPL), Princeton, NJ (United States); Dept. of Energy (DOE), Washington DC (United States)
Sponsoring Org.:
USDOE Office of Science (SC), Fusion Energy Sciences (FES) (SC-24)
OSTI Identifier:
1547058
Alternate Identifier(s):
OSTI ID: 1524461; OSTI ID: 1569021
Grant/Contract Number:  
FC02-04ER54698; SC0014264; AC02-09CH11466; FG02-97ER54415; SC0019352; FG02-08ER54984
Resource Type:
Accepted Manuscript
Journal Name:
Physics of Plasmas
Additional Journal Information:
Journal Volume: 26; Journal Issue: 6; Conference: 60. Annual Meeting APS Division of Plasma Physics, Portland, OR (United States), 5-9 Nov 2018; Journal ID: ISSN 1070-664X
Publisher:
American Institute of Physics (AIP)
Country of Publication:
United States
Language:
English
Subject:
70 PLASMA PHYSICS AND FUSION TECHNOLOGY

Citation Formats

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., and Meneghini, O. Predict-first experiments and modeling of perturbative cold pulses in the DIII-D tokamak. United States: N. p., 2019. Web. doi:10.1063/1.5096800.
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. Predict-first experiments and modeling of perturbative cold pulses in the DIII-D tokamak. United States. doi:10.1063/1.5096800.
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., and Meneghini, O. Tue . "Predict-first experiments and modeling of perturbative cold pulses in the DIII-D tokamak". United States. doi:10.1063/1.5096800.
@article{osti_1547058,
title = {Predict-first experiments and modeling of perturbative cold pulses in the DIII-D tokamak},
author = {Rodriguez-Fernandez, P. and White, A. E. and Howard, N. T. and Grierson, B. A. and Zeng, L. and Yuan, X. and Staebler, G. M. and Austin, M. E. and Odstrcil, T. and Rhodes, T. L. and Sciortino, F. and Rice, J. E. and Thome, K. E. and Angioni, C. and Fable, E. and Meneghini, O.},
abstractNote = {Cold pulses are presented 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, hence providing confidence that local transport modeling is enough to explain cold-pulse propagation and associated phenomenology.},
doi = {10.1063/1.5096800},
journal = {Physics of Plasmas},
number = 6,
volume = 26,
place = {United States},
year = {2019},
month = {6}
}

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