arXiv: Plasma Physics最新文献_第4页

Over-critical sharp-gradient plasma slab produced by the collision of laser-induced blast-waves in a gas jet: Application to high-energy proton acceleration 气体射流中激光诱导爆炸波碰撞产生的过临界急梯度等离子体板:在高能质子加速中的应用

arXiv: Plasma Physics Pub Date : 2020-09-30 DOI: 10.1063/5.0031313

J. Marquès, P. Loiseau, J. Bonvalet, M. Tarisien, E. D'humieres, J. Domange, F. Hannachi, L. Lancia, O. Larroche, P. Nicolaï, P. Puyuelo-Valdes, L. Romagnani, J. Santos, V. Tikhonchuk

{"title":"Over-critical sharp-gradient plasma slab produced by the collision of laser-induced blast-waves in a gas jet: Application to high-energy proton acceleration","authors":"J. Marquès, P. Loiseau, J. Bonvalet, M. Tarisien, E. D'humieres, J. Domange, F. Hannachi, L. Lancia, O. Larroche, P. Nicolaï, P. Puyuelo-Valdes, L. Romagnani, J. Santos, V. Tikhonchuk","doi":"10.1063/5.0031313","DOIUrl":"https://doi.org/10.1063/5.0031313","url":null,"abstract":"The generation of thin and high density plasma slabs at high repetition rate is a key issue for ultra-high intensity laser applications. We present a scheme to create such plasma slabs, based on the propagation and collision in a gas jet of two counter-propagating blast waves (BW). Each BW is launched by a sudden and local heating induced by a nanosecond laser beam that propagates along the side of the jet. The resulting cylindrical BW expands perpendicular to the beam. The shock front, bent by the gas jet density gradient, pushes and compresses the plasma toward the jet center. By using two parallel ns laser beams, this scheme enables to tailor independently two opposite sides of the jet, while avoiding the damage risks associated with counterpropagating laser beams. A parametric study is performed using two and three dimensional hydrodynamic, as well as kinetic simulations. The BWs bending combined with the collision in a stagnation regime increases the density by more than 10 times and generates a very thin (down to few microns), near to over-critical plasma slab with a high density contrast (> 100), and a lifetime of a few hundred picoseconds. Two dimensional particle-in-cell simulations are used to study the influence of plasma tailoring on proton acceleration by a high-intensity sub-picosecond laser pulse. Tailoring the plasma not only at the entrance but also the exit side of the ps-pulse enhances the proton beam collimation, increases significantly the number of high energy protons, as well as their maximum energy.","PeriodicalId":8461,"journal":{"name":"arXiv: Plasma Physics","volume":null,"pages":null},"PeriodicalIF":0.0,"publicationDate":"2020-09-30","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"73587135","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}

引用次数: 10

Nonplanar ion-acoustic subsonic shock waves in dissipative electron-ion-pcd plasmas 耗散电子-离子-等离子体中的非平面离子-声学亚音速激波

arXiv: Plasma Physics Pub Date : 2020-09-28 DOI: 10.1063/5.0031171

A. Mamun, B. Sharmin

引用次数: 8

Effect of dynamic ions on band structure of plasmon excitations 动态离子对等离子激元能带结构的影响

arXiv: Plasma Physics Pub Date : 2020-09-17 DOI: 10.1063/5.0026298

M. Akbari-Moghanjoughi

{"title":"Effect of dynamic ions on band structure of plasmon excitations","authors":"M. Akbari-Moghanjoughi","doi":"10.1063/5.0026298","DOIUrl":"https://doi.org/10.1063/5.0026298","url":null,"abstract":"In this paper we develop a new method to study the plasmon energy band structure in multispecies plasmas. Using this method, we investigate plasmon dispersion band structure of different plasma systems with arbitrary degenerate electron fluid. The linearized Schrodinger-Poisson model is used to derive appropriate coupled pseudoforce system from which the energy dispersion structure is calculated. It is shown that the introduction of ion mobility, beyond the jellium (static ion) model with a wide plasmon energy band gap, can fundamentally modify the plasmon dispersion character leading to a new form of low-level energy band, due to the electron-ion band structure mixing. The effects ionic of charge state and chemical potential of the electron fluid on the plasmonic band structure indicate many new features and reveal the fundamental role played by ions in the phonon assisted plasmon excitations in the electron-ion plasma system. Moreover, our study reveals that ion charge screening has a significant impact on the plasmon excitations in ion containing plasmas. The energy band structure of pair plasmas confirm the unique role of ions on the plasmon excitations in many all plasma environments. Current research helps to better understand the underlying mechanisms of collective excitations in charged environment and the important role of heavy species on the elementary plasmon quasiparticles. The method developed in this research may also be extended for complex multispecies and magnetized quantum plasmas as well as to investigation the surface plasmon-polariton interactions in nanometallic structures.","PeriodicalId":8461,"journal":{"name":"arXiv: Plasma Physics","volume":null,"pages":null},"PeriodicalIF":0.0,"publicationDate":"2020-09-17","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"91462767","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}

引用次数: 3

Shear flow in a three-dimensional complex plasma in microgravity conditions 微重力条件下三维复杂等离子体的剪切流

arXiv: Plasma Physics Pub Date : 2020-09-14 DOI: 10.1103/PhysRevResearch.2.033404

V. Nosenko, M. Pustylnik, M. Rubin-Zuzic, A. Lipaev, A. Zobnin, A. Usachev, H. Thomas, M. Thoma, V. Fortov, O. Kononenko, A. Ovchinin

引用次数: 8

Symmetric ideal magnetofluidostatic equilibria with nonvanishing pressure gradients in asymmetric confinement vessels 非对称约束容器中压力梯度不消失的对称理想磁流平衡

arXiv: Plasma Physics Pub Date : 2020-09-11 DOI: 10.1063/5.0028155

N. Sato

引用次数: 1

CONTROL OF CHARACTERISTICS OF SELF-INJECTED AND ACCELERATED ELECTRON BUNCH IN PLASMA BY LASER PULSE SHAPING ON RADIUS, INTENSITY AND SHAPE 激光脉冲整形对等离子体中自注入和加速电子束半径、强度和形状特性的控制

arXiv: Plasma Physics Pub Date : 2020-09-09 DOI: 10.46813/2019-124-039

V. Maslov, D. Bondar, V. Grigorencko, I. Levchuk, I. Onishchenko

引用次数: 1

Increase of amplitude of accelerating wakefield excited by sequence of short relativistic electron bunches in plasma at magnetic field use 磁场作用下等离子体短相对论电子束序列激发加速尾流场振幅的增加

arXiv: Plasma Physics Pub Date : 2020-09-09 DOI: 10.26565/2312-4334-2017-2-02

D. Bondar, I. Levchuk, V. Maslov, I. Onishchenko

{"title":"Increase of amplitude of accelerating wakefield excited by sequence of short relativistic electron bunches in plasma at magnetic field use","authors":"D. Bondar, I. Levchuk, V. Maslov, I. Onishchenko","doi":"10.26565/2312-4334-2017-2-02","DOIUrl":"https://doi.org/10.26565/2312-4334-2017-2-02","url":null,"abstract":"Earlier, the authors found a mechanism for the sequence of short relativistic electron bunches, which leads to resonant excitation of the wakefield, even if the repetition frequency of bunches differs from the plasma frequency. In this case, the synchronization of frequencies is restored due to defocusing of the bunches which get into the bad phases with respect to the plasma wave. However, in this case, the bunches are lost, which as a result of this do not participate in the excitation of the wakefield. In this paper, numerical simulation was used to study the dynamics of electron bunches and the excitation of the wakefield in a magnetized plasma by a long sequence of short bunches of relativistic electrons. When a magnetic field is used, the defocussed bunches return to the region of interaction with the field after a certain time. In this case, the electrons of the bunches, returning to the necessary phases of the field, participate in the excitation of the wakefield. Also, the use of a magnetic field leads to an increase of the frequency of the excited wave relative to the repetition frequency of bunches. The latter increases the time for maintaining the resonance and, consequently, leads to an increase of the amplitude of the excited wakefield.","PeriodicalId":8461,"journal":{"name":"arXiv: Plasma Physics","volume":null,"pages":null},"PeriodicalIF":0.0,"publicationDate":"2020-09-09","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"88887928","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}

引用次数: 0

A Simple Solver for the Two-Fluid Plasma Model Based on PseudoSpectral Time-Domain Algorithm 基于伪谱时域算法的双流体等离子体模型简单求解器

arXiv: Plasma Physics Pub Date : 2020-09-09 DOI: 10.4208/CICP.OA-2020-0117

B. Morel, R. Giust, K. Ardaneh, F. Courvoisier

引用次数: 1

Identification and characterization of current sheets in collisionless plasmas turbulence 无碰撞等离子体湍流中电流片的识别和表征

arXiv: Plasma Physics Pub Date : 2020-09-08 DOI: 10.17169/REFUBIUM-28637

Amirhassan Chatraee Azizabadi

{"title":"Identification and characterization of current sheets in collisionless plasmas turbulence","authors":"Amirhassan Chatraee Azizabadi","doi":"10.17169/REFUBIUM-28637","DOIUrl":"https://doi.org/10.17169/REFUBIUM-28637","url":null,"abstract":"The properties of current sheets forming in a ion-kinetically turbulent collisionless plasma are investigated by utilizing the results of two-dimensional hybrid-kinetic numerical simulations. For this sake the algorithm proposed by Zhdankin et al. (2013) for the analysis of current sheets forming in MHD-turbulent plasmas, was extended to analyse the role and propertes of current sheets formating in a much noisier kinetically turbulent plasma. The applicability of this approach to the analysis of kinetically-turbulent plasmas is verified. Invesigated are, e.g., the effects of the choice of parameters on the current sheet recognition, viz. the threshold current density, the minimum current density and of the local regions around current density peaks. The main current sheet properties are derived, their peak current density, the peak current carrier velocity (mainly electrons), the thickness and length of the current sheets, i.e. also their aspect ratio (length/thickness). By varying the grid resolution of the simulations it is shown that, as long as the electron inertia is not taken into account, the current sheets thin down well below ion inertial length scale until numerical (grid-resolution based) dissipation stops any the further thinning.","PeriodicalId":8461,"journal":{"name":"arXiv: Plasma Physics","volume":null,"pages":null},"PeriodicalIF":0.0,"publicationDate":"2020-09-08","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"73700375","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}

引用次数: 1

Hamiltonian formulations for perturbed dissipationless plasma equations 扰动无耗散等离子体方程的哈密顿公式

arXiv: Plasma Physics Pub Date : 2020-09-04 DOI: 10.1063/5.0028471

A. Brizard, C. Chandre

引用次数: 4