Enhancements of residual Reynolds stresses by magnetic perturbations in the edge plasmas of the J-TEXT tokamak

Zhao, Kun; Chen, Z.P.; Shi, Yuejiang; Diamond, P. H.; Dong, J. Q.; Chen, Z.Y.; Ding, Yonghua; Zhuang, G.; Liu, Yehui; Zhang, H.Q.; Chen, Y.Q.; Liu, H.; Cheng, J.; Nie, Lin; Ren, Bo; Cheng, Zhifeng; Gao, Li; Zhang, X.Q.; Yang, Zhoujun; Wang, N.C.; Wang, L.; Li, J.Q.; Jin, Wei; Xu, Jianqiang; Yan, L.W.; Liang, Yun-Feng; Xie, Y.Y.; Liu, B.

doi:10.1088/1741-4326/abadad

Cited by 9 publications

(4 citation statements)

References 48 publications

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“…The toroidal magnetic field and plasma current are the same as those with limiter discharges. Here, the LP arrays were changed, and a fast reciprocating probe array with two steps and 12 tips was used to yield floating potential, temperature, density, and Mach number [27,28], as shown in figure 1(c). All the LP arrays were mounted on the middle plane outside of the machine.…”

Section: Methodsmentioning

confidence: 99%

Effects of sawtooth heat pulses on edge flows and turbulence in a tokamak plasma

Zhao

Nagashima

Guo

et al. 2022

Plasma Sci. Technol.

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The enhancements of the edge zonal flows, radial electric field and turbulence are observed in ECRH heated plasmas [K. J. Zhao et al., Nuclear Fusion 2013, 083011]. In this paper, the effects of sawtooth heat pulses on the flows and turbulence are presented. These experiments are performed using multiple Langmuir probe arrays in the edge plasmas of the HL-2A tokamak. The edge zonal flows, radial electric fields, and turbulence are all enhanced by sawteeth. The propagation of the zonal flow and turbulence intensities is also observed. The delay time of the maximal intensity of the electric fields, zonal flows, and turbulence with respect to the sawtooth crashes is estimated as ∼ 1 ms and comparable to that of the sawtooth-triggered I-phases. Not only the zonal flows but also the radial electric fields lag behind the turbulence. Furthermore, the intensities of both the zonal flows and electric field nearly linearly increase/decrease with the increase/decrease of the turbulence intensity. A double source predator-prey model analysis suggests that a relatively strong turbulence source may contribute to the dominant zonal flow formation during sawtooth cycles.

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Section: Methodsmentioning

confidence: 99%

Effects of sawtooth heat pulses on edge flows and turbulence in a tokamak plasma

Zhao

Nagashima

Guo

et al. 2022

Plasma Sci. Technol.

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“…Figures 6(a)-(c) provide the auto-power spectra of the radial electric field fluctuations, Mach numbers, and poloidal electric field fluctuations at q a =4.1, respectively. The Mach numbers can be estimated as = M mach I I 0.4 ln up down ( ) / [25]. From the measured Mach number and electron temperature, the toroidal velocity is evaluated as…”

Section: Toroidal Component Of the Velocity For The Gamsmentioning

confidence: 99%

Toroidal component of velocity for geodesic acoustic modes in the edge plasmas of the J-TEXT tokamak

Xie¹,

Zhao²,

CHEN³

et al. 2021

Plasma Sci. Technol.

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The toroidal component of the velocity for geodesic acoustic modes (GAMs) is first demonstrated. Multiple Langmuir probe arrays set up near the top tokamak of the J-TEXT were utilized for this study. A significant peak at the GAM frequency is observed in Mach number fluctuations. The toroidal velocity for the GAMs is estimated as∼10-100 m s −1 and increases with the poloidal velocity. The ratio of toroidal component to the poloidal one of the velocity is mainly located in the interval between 0.3 and 1.0. With higher safety factors q, the ratio almost does not change with decreasing the safety factor, whereas it goes up sharply at low q. The coherencies between poloidal electric fields and Mach number fluctuations in turbulence frequency bands are also evaluated, and are higher than those between radial electric fields and Mach number fluctuations.

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“…where m i is the ion mass, ν ⊥ is the perpendicular kinematic viscosity, v pinch is the momentum pinch velocity, and Γ resi ϕ is the radial flux due to residual stress [110,111]. We note that Equation ( 28)-when disregarding the two final right-hand side terms-has the same structure as Equation ( 4).…”

mentioning

confidence: 99%

The Chimera Revisited: Wall- and Magnetically-Bounded Turbulent Flows

Basse

2024

Fluids

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Enhancements of residual Reynolds stresses by magnetic perturbations in the edge plasmas of the J-TEXT tokamak

Cited by 9 publications

References 48 publications

Effects of sawtooth heat pulses on edge flows and turbulence in a tokamak plasma

Effects of sawtooth heat pulses on edge flows and turbulence in a tokamak plasma

Toroidal component of velocity for geodesic acoustic modes in the edge plasmas of the J-TEXT tokamak

The Chimera Revisited: Wall- and Magnetically-Bounded Turbulent Flows

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