arXiv: Plasma Physics最新文献_第2页

Stationary states of polytropic plasmas 多向等离子体的稳态

arXiv: Plasma Physics Pub Date : 2020-11-11 DOI: 10.1063/5.0024222

R. Guo

引用次数: 3

ITER cold VDEs in the limit of perfectly conducting walls ITER在完全导电壁的极限下冷却vde

arXiv: Plasma Physics Pub Date : 2020-11-11 DOI: 10.1063/5.0037464

C. Clauser, S. Jardin

{"title":"ITER cold VDEs in the limit of perfectly conducting walls","authors":"C. Clauser, S. Jardin","doi":"10.1063/5.0037464","DOIUrl":"https://doi.org/10.1063/5.0037464","url":null,"abstract":"Recently, it has been shown that a vertical displacement event (VDE) can occur in ITER even when the walls are perfect conductors, as a consequence of the current quench [A. H. Boozer, Physics of Plasmas 26 114501 (2019)]. We used the extended-MHD code M3D-C1 with an ITER-like equilibrium and induced a current quench to explore cold VDEs in the limit of perfectly conducting walls, using different wall geometries. In the particular case of a rectangular wall with the side walls far away from the plasma, we obtained very good agreement with the analytical model developed by Boozer that considers a top/bottom flat-plates wall. We show that the solution in which the plasma stays at the initial equilibrium position is improved when bringing the side walls closer to the plasma. When using the ITER first wall in the limit of a perfect conductor, the plasma stays stable at the initial equilibrium position far beyond the value predicted by the flat-plates wall limit. On the other hand, when considering the limit in which the inner shell of the ITER vacuum vessel is acting as a perfect conductor, the plasma is displaced during the current quench but the edge safety factor stays above $2$ longer in the current decay compared to the flat-plates wall limit. In all the simulated cases, the vertical displacement is found to be strongly dependent on the plasma current, in agreement with a similar finding in the flat-plates wall limit, showing an important difference with usual VDEs in which the current quench is not a necessary condition.","PeriodicalId":8461,"journal":{"name":"arXiv: Plasma Physics","volume":"39 1","pages":""},"PeriodicalIF":0.0,"publicationDate":"2020-11-11","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"76573005","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: 4

Turbulent transport of fast ions in tokamak plasmas in the presence of resonant magnetic perturbations 共振磁扰动下托卡马克等离子体中快离子的湍流输运

arXiv: Plasma Physics Pub Date : 2020-11-04 DOI: 10.1063/5.0035541

D. Palade

引用次数: 3

Laser-Accelerated, Low-Divergence 15-MeV Quasimonoenergetic Electron Bunches at 1 kHz 激光加速，低发散15兆电子伏特准单能电子束在1千赫

arXiv: Plasma Physics Pub Date : 2020-10-29 DOI: 10.1103/PhysRevX.11.021055

F. Salehi, M. Le, L. Railing, M. Kolesik, H. Milchberg

引用次数: 18

Thermomagnetic instability of plasma composition gradients 等离子体组成梯度的热磁不稳定性

arXiv: Plasma Physics Pub Date : 2020-10-28 DOI: 10.1063/5.0027210

J. Sadler, Hui Li

引用次数: 1

Hydrodynamical model of QED cascade expansion in an extremely strong laser pulse 超强激光脉冲中QED级联膨胀的流体动力学模型

arXiv: Plasma Physics Pub Date : 2020-10-27 DOI: 10.1063/5.0035347

A. S. Samsonov, I. Kostyukov, E. Nerush

引用次数: 4

Exact hybrid-kinetic equilibria for magnetized plasmas with shearing flows 剪切流磁化等离子体的精确混合动力学平衡

arXiv: Plasma Physics Pub Date : 2020-10-14 DOI: 10.1051/0004-6361/202039656

G. Guzzi, A. Settino, F. Valentini, F. Malara

{"title":"Exact hybrid-kinetic equilibria for magnetized plasmas with shearing flows","authors":"G. Guzzi, A. Settino, F. Valentini, F. Malara","doi":"10.1051/0004-6361/202039656","DOIUrl":"https://doi.org/10.1051/0004-6361/202039656","url":null,"abstract":"Context. Magnetized plasmas characterized by shearing flows are present in many natural contexts, such as the Earth's magnetopause and the solar wind. The collisionless nature of involved plasmas requires a kinetic description. When the width of the shear layer is of the order of ion scales, the Hybrid Vlasov-Maxwell approach can be adopted. Aims. The aim of the paper is to derive explicit forms for stationary configurations of magnetized plasmas with planar shearing flows,within the Hybrid Vlasov-Maxwell description. Two configurations are considered: the first with a uniform magnetic field obliquely directed with respect to the bulk velocity; and the second with a uniform-magnitude variable-direction magnetic field. Methods. Stationary ion distribution functions are obtained by combining single-particle constant of motions, which are derived studying particle dynamics. Preliminary information about the form of the distribution functions are analytically derived considering a local approximation for the background electromagnetic field. Then, a numerical method is set up to obtain a solution for general profiles. Results. The explicit distribution functions that are found allow to obtain profiles of density, bulk velocity, temperature and heat flux. Anisotropy and agyrotropy in the distribution function are also evaluated. Stationarity of the solution during numerical simulations is checked in the uniform oblique magnetic field case. Conclusions. The considered configurations can be used as models for the Earth's magnetopause in simulations of the Kelvin-Helmholtz instability.","PeriodicalId":8461,"journal":{"name":"arXiv: Plasma Physics","volume":"100 1","pages":""},"PeriodicalIF":0.0,"publicationDate":"2020-10-14","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"82031144","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

Non destructive testing of actively cooled plasma facing components by means of thermal transient excitation and infrared imaging. 热瞬态激发和红外成像技术在主动冷却等离子体表面构件无损检测中的应用。

arXiv: Plasma Physics Pub Date : 2020-10-06 DOI: 10.1016/B978-0-444-82762-3.50081-1

R. Mitteau, S. Berrebi, P. Chappuis, Ph. Darses, A. Dufayet, L. Garampon, D. Guilhem, M. Lipa, V. Martin, H. Roche

引用次数: 14

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":"4 1","pages":""},"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