Structures and dynamics in a two-dimensional dipolar dust particle system

Hou, Xue-Ni; Liu, Y. H.; Kravchenko, O. V.; Lapushkina, T. A.; Azarova, O. A.; Chen, Z. Y.; Huang, Feng

doi:10.1063/1.5005806

Cited by 9 publications

(8 citation statements)

References 26 publications

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“…Due to the significant difference in the linear growth rate between n/m = 1/2 mode and n/m = 2/4 GAE, it is difficult to analyse n/m = 1/2 mode. To reduce the numerical noise induced by n/m = 2/4 GAE, n =+1 filter is applied on the calculated δP h∥ and δP h⊥ from equation (17)(18). This filter performs Fourier transform along the toroidal and poloidal directions of Boozer coordinate.…”

Section: Time Evolution and Spatial Profile Of Alfvén Eigenmodesmentioning

confidence: 99%

“…Several simulation codes have been developed to study the interaction between energetic particles and AEs in magnetic confinement fusion devices: MEGA [13,14] (full-MHD hybrid simulation model), EUTERPE [15] and GTC [16] (gyrokinetic PIC code), NIMROD [17,18] (a finite element hybrid MHD code) and FAR3D [19] (a reduced-MHD equation with Landau closure model for energetic particle). MEGA, EUTERPE, GTC and FAR3D have been utilized both tokamak and stellarator/heliotron configuration.…”

Section: Introductionmentioning

confidence: 99%

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Magnetohydrodynamic hybrid simulation of Alfvén eigenmodes in Heliotron J, a low shear helical axis stellarator/heliotron

Adulsiriswad¹,

Todo²,

Yamamoto³

et al. 2020

Nucl. Fusion

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Alfvén eigenmodes destabilized by energetic particles in Heliotron J, a low magnetic shear helical axis stellarator/heliotron with four toroidal equilibrium field periods, are investigated with MEGA, a hybrid simulation code for energetic particles interacting with a magnetohydrodynamic fluid. The objectives of this study are to validate the MEGA simulation results on Alfvén eigenmodes in Heliotron J, and to clarify the properties of Alfvén eigenmodes. The experimentally observed global Alfvén eigenmode (GAE) was reproduced with MEGA simulations based on the experimental bulk plasma temperature and density profiles. Beside GAE, GAE was also observed with lower amplitude and linear growth rate. The frequency and spatial location of GAE are close to those of the experimentally observed energetic particle mode (EPM). For GAE, it was found that the three-dimensional spatial profile of the GAE was primarily composed of n = 2 harmonics while the contribution from the other toroidal mode numbers such as n = 2 ± iNfp was weak, where ‘i’ and ‘Nfp’ are arbitrary integer and toroidal field period, respectively. This indicates that the coupling of harmonics with the same toroidal mode number through toroidicity is dominant for the GAE spatial profile, and the coupling with the different toroidal mode numbers through helicity and bumpiness has minor effects. For GAE, the coupling of harmonic through toroidicity is weaker than that of GAE. The non-linear evolutions of the GAE and GAE destabilized by energetic particles with a bump-on-tail distribution and a slowing-down distribution were compared. Weak dependence of the linear growth rate for both and modes on charge-exchange time were implied.

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Section: Time Evolution and Spatial Profile Of Alfvén Eigenmodesmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

Magnetohydrodynamic hybrid simulation of Alfvén eigenmodes in Heliotron J, a low shear helical axis stellarator/heliotron

Adulsiriswad¹,

Todo²,

Yamamoto³

et al. 2020

Nucl. Fusion

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“…This concept has been used to magnetize complex plasma giving rise to effective magnetic fields exceeding 10 4 T [39,40]. In fact, millimeter-sized dust particles in a complex plasma can exhibit large electric dipole moments [41] which can be exposed to large magnetic fields such that a Hall parameter κ of about unity is in reach. However, it is not yet clear how one would prepare oppositely charged particles in the rotating electrode setup.…”

Section: Discussion and Outlookmentioning

confidence: 99%

Strongly enhanced dynamics of a charged Rouse dimer by an external magnetic field

et al. 2022

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While the dynamics of dimers and polymer chains in a viscous solvent is well understood within the celebrated Rouse model, the effect of an external magnetic field on the dynamics of a charged chain is much less understood. Here we generalize the Rouse model for a charged dimer to include the effect of an external magnetic field. Our analytically solvable model allows a fundamental insight into the magneto-generated dynamics of the dimer in the overdamped limit as induced by the Lorentz-force. Surprisingly, for a dimer of oppositely charged particles, we find an enormous enhancement of the dynamics of the dimer center which exhibits even a transient superballistic behavior. This is highly unusual in an overdamped system for there is neither inertia nor any internal or external driving. We attribute this to a significant translation and rotation coupling due to the Lorentz force. We also find that magnetic field reduces the mobility of a dimer along its orientation and its effective rotational diffusion coefficient. In principle, our predictions can be tested by experiments with colloidal particles and complex plasmas.

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“…由于等离子体中尘埃子系统具有独特的时间空间尺度(微米毫秒量级), 使得其在实验中可以用普通相机进行观测, 因此尘埃等离子体还为研究凝聚态物理提供了一个宏观可视化研究平台. 尘埃等离子体内部这些复杂的过程, 使得系统能够呈现出诸如等离子体晶格、尘埃声波等新奇的物理现象 [10][11][12][13][14][15][16] , 近些年引起了人们极大的关注. 尘埃颗粒通过与等离子体粒子以及不稳定性波动模式相互作用而吸收能量并转化为颗粒动能 [17][18][19] , 然而, 通常情况下颗粒悬浮在极板鞘层附近随机运动, 其获得的动能不能被有效收集与利用.…”

Section: 引言unclassified