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

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.

doi:10.1063/1.5096800

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

Journal Article · 04 June 2019 · Physics of Plasmas

DOI: https://doi.org/10.1063/1.5096800 · OSTI ID:1547058

^[1]; White, A. E. ^[1];

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^[3]; Yuan, X. ^[2];

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^[1]; Rhodes, T. L. ^[3]; Sciortino, F. ^[1];

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^[6]; Fable, E. ^[6]; Meneghini, O. ^[4]

Massachusetts Inst. of Technology (MIT), Cambridge, MA (United States)
Princeton Plasma Physics Lab. (PPPL), Princeton, NJ (United States)
Univ. of California, Los Angeles, CA (United States)
General Atomics, San Diego, CA (United States)
Univ. of Texas, Austin, TX (United States)
Max Planck Institut für Plasmaphysik, Garching (Germany)

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.

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Research Organization:: Princeton Plasma Physics Laboratory (PPPL), Princeton, NJ (United States)

Sponsoring Organization:: USDOE Office of Science (SC), Fusion Energy Sciences (FES) (SC-24)

Grant/Contract Number:: FC02-04ER54698; SC0014264; AC02-09CH11466; FG02-97ER54415; SC0019352; FG02-08ER54984

OSTI ID:: 1547058

Journal Information:: Physics of Plasmas, Journal Name: Physics of Plasmas Journal Issue: 6 Vol. 26; ISSN 1070-664X

Publisher:: American Institute of Physics (AIP)Copyright Statement

Country of Publication:: United States

Language:: English

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