A quantitative model for heat pulse propagation across large helical device plasmas

Zhu, Hao; Dendy, R. O.; Chapman, Sandra C.; Inagaki, S.

doi:10.1063/1.4923307

Cited by 5 publications

(7 citation statements)

References 33 publications

Supporting

Mentioning

Contrasting

Order By: Relevance

“…Other models have been proposed in past work [63,64,65,66], but their validity to reproduce quantitatively the core temperature behavior and the experimental trends with plasma parameters still remains to be explored. The success of local quasilinear transport models based on nonlinear gyrokinetics (e.g.…”

Section: Discussionmentioning

confidence: 99%

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

et al. 2019

View full text Add to dashboard Cite

Cold pulses are introduced in Ohmic DIII-D tokamak plasmas, revealing for the first time in this machine a quick increase of core electron temperature shortly after the edge cold-pulse injection at low collisionality.The experimental results are consistent with predict-first simulations enabled by the Trapped Gyro-Landau-Fluid (TGLF) 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 (TEM) turbulence at low collisionality, thus providing confidence that local transport modeling is enough to explain cold-pulse propagation and associated phenomenology.

show abstract

Section: Discussionmentioning

confidence: 99%

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

et al. 2019

View full text Add to dashboard Cite

show abstract

“…Therefore, a slightest imbalance of the forces is sufficient for providing a finite velocity and the propagation of δB. The standard transport analysis [1,[3][4][5] postulates an absence of a plasma perpendicular velocity when the equilibrium is thus perturbed. This is partially justified by the presence of strong toroidal field preventing large radial displacement v•dt in a flux-conserving plasma in tokamaks and stellarators.…”

Section: Formulation Of the Problemmentioning

confidence: 99%

“…Non-local transport (NLT) phenomena (core plasma heating appearing as a reaction on its cooling at the edge) attracts attention of the fusion society for decades [1][2][3][4][5]. Up to now there is no convincing explanation of this effect, though a number of models have been proposed, see reviews in [1,2] and more recent approaches [3,4]. The term NLT reflects the inability of simple diffusive models to reproduce the inversion of the heat/cooling pulse, while their potentials have not yet been exhausted.…”

Section: Introductionmentioning

confidence: 99%

“…The term NLT reflects the inability of simple diffusive models to reproduce the inversion of the heat/cooling pulse, while their potentials have not yet been exhausted. In such models reviewed in [1,2] and briefly mentioned in [3][4][5] (and in seemingly more advanced ones involving the turbulence etc.) the energy exchange between the plasma and the magnetic field is completely ignored, while it can be essential [2,6,7] in tokamaks and stellarators.…”

Section: Introductionmentioning

confidence: 99%

“…Large external forces combined with small plasma motion can produce a significant energy transfer acting as an additional heat source and strongly affecting NLT [2,6,7]. This exchange has not been incorporated or even evaluated in [3][4][5] and similar studies [8,9]. Here we consider this mechanism and take into account the plasma displacement caused by the perturbation of the force balance during Heat Pulse Propagation (HPP).…”

Section: Introductionmentioning

confidence: 99%

See 2 more Smart Citations

Modeling of Heat Pulse Propagation During TESPEL Injection into the LHD Plasma

Sergeev

Dnestrovskiy

Frolov

et al. 2019

Plasma and Fusion Research

View full text Add to dashboard Cite

Anomalous transport is a paradigm for analysis of both Power Balance (PB) and Heat Pulse Propagation (HPP) in magnetically confined plasmas including so called non-local transport (NLT) phenomena (core heating as a reaction on the edge cooling). One of the alternative explanations of the NLT proposes to take into account the plasma motion caused by the perturbation of the force balance during HPP. First results of numerical modeling of the electron heat transport by the ASTRA code confirm the viability of this approach.

show abstract

Local transport dynamics of cold pulses in tokamak plasmas

Rodriguez-Fernandez

Angioni

White

2022

Rev. Mod. Plasma Phys.

View full text Add to dashboard Cite

For over two decades, our fundamental understanding of energy transport dynamics in the core of tokamak plasmas had been challenged by the striking observation of temperature perturbation reversals following the injection of cold pulses at the plasma edge. These phenomena were first discovered by Gentle et al. (Phys. Rev. Lett. 74(18):3620–3623, 1995) in 1995 and had long been suggested to be evidence of nonlocal transport effects. In recent years, a new explanation to these phenomena has emerged, fully consistent with the theory of turbulent transport in magnetized plasmas and in remarkable agreement with experiment. This article reviews the experimental observation of temperature reversals in tokamak plasmas and presents the explanation based on local transport physics.

show abstract

A quantitative model for heat pulse propagation across large helical device plasmas

Cited by 5 publications

References 33 publications

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

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

Modeling of Heat Pulse Propagation During TESPEL Injection into the LHD Plasma

Local transport dynamics of cold pulses in tokamak plasmas

Contact Info

Product

Resources

About