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Current neutralization and plasma polarization for intense ion beams propagating through magnetized background plasmas in a two-dimensional slab approximation

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Frontiers of physics 2014年第2期9卷 226-233页

作者： Zhang-Hu Hu Mao-Du Chen You-Nian Wang School of Physics and Optoeleetronic Technology Dalian University of Technology Dalian 116024 China

A two-dimensional electromagnetic Particle-in-Cell （PIC） simulation model is proposed to study the propagation of intense, ion beams with beaIn width wb small compared to the electron skin depth c/wpe through background plaslnas in tile presence of external applied magnetic fields. The effcctive eleetron gyrora,dius wge is found to be an important parameter for ion beam transport in the presence of magnetic fields,In the bealn regions, the background plasmas respond differently to the ion beanl of width wb〈wge and wb 〉 wge for the given magnetic field and beaan encrgy, For the case of beam width wb 〈 wge with relative weak external magnetic fiehts, the rotalion effects of plasma electrons a,re found to be signifieant and contributes to the signitica,nt enilaneeinent of the self electric and seif-magnetic fields. While for the ease of beam width wb 〉 wge with relative strong external magnetic fields, the rotation effects of plasma cleetrons are strongly inhibited and a, well neutraliza, tion of ion beam current can be found. Finally, the influences of diftiuent beam widths. beam energies and magnetic fields on the neutralization of ion bc, anl eurrellt are summarized for the eases of wb 〈 wge〈 c/wpe,wge 〈wb〈c/wbp and wb〈c/wpe〈wge.

关键词： current neutralization ion beams magnetized plasmas Particle-in-Cell simulations

Investigation of the Rayleigh–Taylor instability in charged fluids

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Communications in Theoretical Physics 2023年第10期75卷 138-145页

作者： Weiping Zhang Zhongzheng Li Wenshan Duan College of Physics and Electronics Engineering Northwest Normal UniversityLanzhou 730070China Department of Physics Gansu Normal University For NationalitiesHezuo 747000China

The present study shows that the Rayleigh–Taylor(RT)instability and its growth rate are strongly dependent on the charge-mass ratio of charged particles in a charged fluid.A higher charge-mass ratio of the charged fluid appears to result in a stronger effect of the magnetic field to suppress the RT *** study the RT instabilities for both dusty plasma(small chargemass ratio of charged particles)and ion-electron plasma(large charge-mass ratio of charged particles).It is found that the impact of the external magnetic field to suppress the RT instability for ion-electron plasma is much greater than that for dusty *** is also shown that,for a dusty plasma,in addition to region parameters such as the external magnetic field,region length,its gradient,as well as dust particle parameters such as number density,mass,and charge of dust particles,the growth rate of the RT instability in a dusty plasma also depends on parameters of both electrons and ions such as the number densities and temperatures of both electrons and ions.

关键词： Rayleigh–Taylor(RT)instability charged fluid magnetized plasmas dusty plasma

Improved Unlike-Particle Collision Operator for delta-f Drift-Kinetic Particle Simulations

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Communications in Computational Physics 2011年第2期9卷 231-239页

作者： R.A.Kolesnikov W.X.Wang F.L.Hinton Los Alamos National Laboratory Los AlamosNM 87544USA Plasma Physics Laboratory P.O.Box 451PrincetonNJ 08543USA Center for Astrophysics&Space Science University of CaliforniaSan DiegoLa JollaCA 92093USA

plasmas in modern tokamak experiments contain a significant fraction of impurity ion species in addition to main deuterium background.A new unlike-particle collision operator forδf particle simulation has been developed to study the nonlocal effects of impurities due to finite ion orbits on neoclassical transport in toroidal plasmas.A new algorithm for simulation of cross-collisions between different ion species includes test-particle and conserving field-particle *** improved field-particle operator is designed to exactly enforce conservation of number,momentum and energy.

关键词： Drift-kinetics magnetized plasmas

Electromagnetic High Frequency Gyrokinetic Particle-in-Cell Simulation

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Communications in Computational Physics 2008年第8期4卷 575-591页

作者： R.A.Kolesnikov W.W.Lee H.Qin Plasma Physics Laboratory Princeton UniversityP.O.Box 451PrincetonNew Jersey 08543USA

Using the gyrocenter-gauge kinetic theory,an electromagnetic version of the high frequency gyrokinetic numerical algorithm for particle-in-cell simulation has been *** new algorithm,being an alternative to a direct Lorentz-force simulation,offers an efficient way to simulate the dynamics of plasma heating and current drive with radio frequency *** formalism enables separation of gyrocenter and gyrophase motions of a particle in a strong magnetic *** this point of view,a particlemay be viewed as a combination of a slow gyrocenter and a quickly changing Kruskal *** this approach,the nonlinear dynamics of high frequency waves is described by the evolution of Kruskal rings based on first principles *** efficiency of the algorithm is due to the fact that the simulation particles are advanced along the slow gyrocenter orbits,while the Kruskal rings capture fast gyrophase ***,the gyrokinetic formalism allows separation of the cold response from kinetic effects in the current,which allows one to use much smaller number of particles than what is required by a direct Lorentz-force ***,the new algorithm offers the possibility to have particle refinement together with mesh refinement,when *** illustrate the new algorithm,a simulation of the electromagnetic low-hybrid wave propagating in inhomogeneous magnetic field is presented.

关键词： Gyrokinetics magnetized plasmas plasma kinetic equations

A novel multi-shot target platform for laser-driven laboratory astrophysics experiments

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High Power Laser Science and Engineering 2023年第2期11卷 11-19页

作者： Pablo Perez-Martin Irene Prencipe Manfred Sobiella Fabian Donat Ning Kang Zhiyu He Huiya Liu Lei Ren Zhiyong Xie Jun Xiong Yan Zhang Florian-Emanuel Brack MichalČervenák Pavel Gajdoš Lenka Hronová Kakolee Kaniz Michaela Kozlová Florian Kroll Xiayun Pan Gabriel Schaumann Sushil Singh MichalŠmíd Francisco Suzuki-Vidal Panzheng Zhang Jinren Sun Jianqiang Zhu Miroslav Krůs Katerina Falk Helmholtz-Zentrum Dresden-Rossendorf Institute of Radiation PhysicsDresdenGermany Technische Universität Dresden DresdenGermany Key Laboratory of High Power Laser and Physics Shanghai Institute of Optics and Fine MechanicsChinese Academy of SciencesShanghaiChina Shanghai Institute of Laser Plasma China Academy of Engineering PhysicsShanghaiChina Institute of Plasma Physics Czech Academy of SciencesPragueCzech Republic Czech Technical University Faculty of Nuclear Sciences and Physical EngineeringPragueCzech Republic Department of Physics Jagannath UniversityDhakaBangladesh ELI-Beamlines Institute of PhysicsCzech Academy of SciencesPragueCzech Republic Institute for Nuclear Physics Technical University of DarmstadtDarmstadtGermany Institute of Physics Czech Academy of SciencesPragueCzech Republic Blackett Laboratory Imperial CollegeLondonUnited Kingdom First Light Fusion Oxford Industrial ParkYarntonOxfordUnited Kingdom

A new approach to target development for laboratory astrophysics experiments at high-power laser facilities is *** the dawn of high-power lasers,laboratory astrophysics has emerged as a field,bringing insight into physical processes in astrophysical objects,such as the formation of *** important factor for success in these experiments is *** date,targets have mainly relied on expensive and challenging microfabrication *** design presented incorporates replaceable machined parts that assemble into a structure that defines the experimental *** can make targets cheaper and faster to manufacture,while maintaining robustness and *** platform is intended for experiments on plasma flows,but it is flexible and may be adapted to the constraints of other experimental *** of targets used in experimental campaigns are shown,including a design for insertion in a high magnetic field *** results are included,demonstrating the performance of the targets.

关键词： high magnetic fields laboratory astrophysics laser-plasma interaction magnetized plasmas target design