arXiv - PHYS - Plasma Physics最新文献_第9页

Magneto-Hydrodynamic Simulations of Pedestal Instabilities for Tokamak Plasmas with Different Ion Masses 不同离子质量托卡马克等离子体的台座不稳定性的磁流体动力学模拟

arXiv - PHYS - Plasma Physics Pub Date : 2024-08-08 DOI: arxiv-2408.04518

Matthias Rosenthal

{"title":"Magneto-Hydrodynamic Simulations of Pedestal Instabilities for Tokamak Plasmas with Different Ion Masses","authors":"Matthias Rosenthal","doi":"arxiv-2408.04518","DOIUrl":"https://doi.org/arxiv-2408.04518","url":null,"abstract":"In this bachelor's thesis, isotope effects for pedestal instabilities have\u0000been studied based on an ASDEX Upgrade H-Mode scenario. This was done using the\u0000JOREK code for extended MHD simulations, including the ion diamagnetic drift\u0000and the establishment of ExB flows. Simulations with single toroidal harmonics\u0000were performed for multiple times during the build-up of the pedestal, to\u0000assess the evolution of the linear stability of modes occurring near the edge.\u0000When changing the average ion masses from 2.0 to 2.5 and 3.0, the variations\u0000were small, and MHD's momentum equation was shown to be the major cause for\u0000them. As a second step, simulations with multiple toroidal harmonics were\u0000performed to simulate an Edge Localized Mode (ELM) crash, again comparing\u0000between the average ion masses of 2.0, 2.5, and 3.0. The resulting variations\u0000of heat and particle losses were compared to JET results. The experimental\u0000differences between ion masses could not be reproduced. Together with the fact\u0000that the simulations' pedestal for an average ion mass of 2.5 and 3.0 was not\u0000matched to the experiment, this indicates that other effects, such as\u0000small-scale turbulences, must be included - for example, by adapting the\u0000simulations' transport coefficients - to explain the experimental differences.","PeriodicalId":501274,"journal":{"name":"arXiv - PHYS - Plasma Physics","volume":"44 1","pages":""},"PeriodicalIF":0.0,"publicationDate":"2024-08-08","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"141941532","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

Transverse instability of electron-acoustic solitons in a relativistic degenerate astrophysical magnetoplasma 相对论退化天体物理磁等离子体中电子声孤子的横向不稳定性

arXiv - PHYS - Plasma Physics Pub Date : 2024-08-08 DOI: arxiv-2408.04404

A. P. Misra, A. Abdikian

{"title":"Transverse instability of electron-acoustic solitons in a relativistic degenerate astrophysical magnetoplasma","authors":"A. P. Misra, A. Abdikian","doi":"arxiv-2408.04404","DOIUrl":"https://doi.org/arxiv-2408.04404","url":null,"abstract":"We study the nonlinear theory of small-amplitude electron-acoustic solitons\u0000(EASs) in a relativistic astrophysical magnetoplasma consisting of\u0000two-temperature electrons: a sparse population of relativistic nondegenerate\u0000classical electrons and a group of fully degenerate dense relativistic\u0000electrons (main constituent) immersed in a static magnetic field with a\u0000neutralizing stationary ion background. By using the multiple-scale reductive\u0000perturbation technique with the Lorentz transformation, the Zakharov-Kuznetsov\u0000(ZK) and the modified Zakharov-Kuznetsov (mZK) equations are derived to\u0000describe the evolution of EASs in two different regimes of relativistic\u0000degeneracy: $r_{d0}<50$ and $r_{d0}gtrsim50$. The characteristics of the plane\u0000soliton solutions of ZK and mZK equations and the soliton energy are studied.\u0000We show that the solitons moving at an angle $alpha$ to the external magnetic\u0000field can be unstable under transverse long-wavelength perturbations. The\u0000growth rates of instabilities are obtained and analyzed with the effects of the\u0000relativity parameter $beta_{rm{cl}}=k_BT_{rm{cl}}/m_ec^2$ and the degeneracy\u0000parameter $r_{d0}$, where $k_B$ is the Boltzmann constant and $T_{rm{cl}}$ is\u0000the temperature of classical electrons. Interestingly, the ZK solitons, even if\u0000it is stable for the first-order perturbations, can be unstable in the\u0000second-order correction. Furthermore, while the first-order growth rates of\u0000perturbations for ZK solitons tend to vanish as $alpharightarrow 38^circ$,\u0000that for the mZK soliton goes to zero as $alpharightarrow 90^circ$. However,\u0000depending on the angle $alpha$, the growth rates are found to be reduced\u0000either by increasing the values of $beta_{rm{cl}}$ or by decreasing the\u0000values of $r_{d0}$. The applications of our results to astrophysical plasmas,\u0000such as those in the environments of white dwarfs are discussed.","PeriodicalId":501274,"journal":{"name":"arXiv - PHYS - Plasma Physics","volume":"1 1","pages":""},"PeriodicalIF":0.0,"publicationDate":"2024-08-08","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"141941371","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

Short wavelength limit of the dynamic Matsubara local field correction 动态松原局部场校正的短波长极限

arXiv - PHYS - Plasma Physics Pub Date : 2024-08-07 DOI: arxiv-2408.04669

Tobias Dornheim, Panagiotis Tolias, Zhandos Moldabekov, Jan Vorberger

{"title":"Short wavelength limit of the dynamic Matsubara local field correction","authors":"Tobias Dornheim, Panagiotis Tolias, Zhandos Moldabekov, Jan Vorberger","doi":"arxiv-2408.04669","DOIUrl":"https://doi.org/arxiv-2408.04669","url":null,"abstract":"We investigate the short wavelength limit of the dynamic Matsubara local\u0000field correction $widetilde{G}(mathbf{q},z_l)$ of the uniform electron gas\u0000based on direct emph{ab initio} path integral Monte Carlo (PIMC) results over\u0000an unprecedented range of wavenumbers, $qlesssim20q_textnormal{F}$, where\u0000$q_textnormal{F}$ is the Fermi wavenumber. We find excellent agreement with\u0000the analytically derived asymptotic limit by Hou emph{et\u0000al.}~[textit{Phys.~Rev.~B}~textbf{106}, L081126 (2022)] for the static local\u0000field correction and empirically confirm the independence of the short\u0000wavelength limit with respect to the Matsubara frequency $z_l$. In the warm\u0000dense matter regime, we find that the onset of the quantum tail in the static\u0000local field correction closely coincides with the onset of the algebraic tail\u0000in the momentum distribution function and the corresponding empirical criterion\u0000reported by Hunger emph{et al.}~[textit{Phys.~Rev.~E} textbf{103}, 053204\u0000(2021)]. In the strongly coupled electron liquid regime, our calculations\u0000reveal a more complicated non-monotonic convergence towards the $qtoinfty$\u0000limit that is shaped by the spatial structure in the system. We expect our\u0000results to be of broad interest for a number of fields including the study of\u0000matter under extreme conditions, the development of improved dielectric\u0000theories, and the construction of advanced exchange--correlation functionals\u0000for thermal density functional theory.","PeriodicalId":501274,"journal":{"name":"arXiv - PHYS - Plasma Physics","volume":"23 1","pages":""},"PeriodicalIF":0.0,"publicationDate":"2024-08-07","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"141941531","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

Enabling High-Throughput Parallel I/O in Particle-in-Cell Monte Carlo Simulations with openPMD and Darshan I/O Monitoring 利用 openPMD 和 Darshan I/O 监控在细胞内粒子蒙特卡罗模拟中实现高吞吐量并行 I/O

arXiv - PHYS - Plasma Physics Pub Date : 2024-08-06 DOI: arxiv-2408.02869

Jeremy J. Williams, Daniel Medeiros, Stefan Costea, David Tskhakaya, Franz Poeschel, René Widera, Axel Huebl, Scott Klasky, Norbert Podhorszki, Leon Kos, Ales Podolnik, Jakub Hromadka, Tapish Narwal, Klaus Steiniger, Michael Bussmann, Erwin Laure, Stefano Markidis

{"title":"Enabling High-Throughput Parallel I/O in Particle-in-Cell Monte Carlo Simulations with openPMD and Darshan I/O Monitoring","authors":"Jeremy J. Williams, Daniel Medeiros, Stefan Costea, David Tskhakaya, Franz Poeschel, René Widera, Axel Huebl, Scott Klasky, Norbert Podhorszki, Leon Kos, Ales Podolnik, Jakub Hromadka, Tapish Narwal, Klaus Steiniger, Michael Bussmann, Erwin Laure, Stefano Markidis","doi":"arxiv-2408.02869","DOIUrl":"https://doi.org/arxiv-2408.02869","url":null,"abstract":"Large-scale HPC simulations of plasma dynamics in fusion devices require\u0000efficient parallel I/O to avoid slowing down the simulation and to enable the\u0000post-processing of critical information. Such complex simulations lacking\u0000parallel I/O capabilities may encounter performance bottlenecks, hindering\u0000their effectiveness in data-intensive computing tasks. In this work, we focus\u0000on introducing and enhancing the efficiency of parallel I/O operations in\u0000Particle-in-Cell Monte Carlo simulations. We first evaluate the scalability of\u0000BIT1, a massively-parallel electrostatic PIC MC code, determining its initial\u0000write throughput capabilities and performance bottlenecks using an HPC I/O\u0000performance monitoring tool, Darshan. We design and develop an adaptor to the\u0000openPMD I/O interface that allows us to stream PIC particle and field\u0000information to I/O using the BP4 backend, aggressively optimized for I/O\u0000efficiency, including the highly efficient ADIOS2 interface. Next, we explore\u0000advanced optimization techniques such as data compression, aggregation, and\u0000Lustre file striping, achieving write throughput improvements while enhancing\u0000data storage efficiency. Finally, we analyze the enhanced high-throughput\u0000parallel I/O and storage capabilities achieved through the integration of\u0000openPMD with rapid metadata extraction in BP4 format. Our study demonstrates\u0000that the integration of openPMD and advanced I/O optimizations significantly\u0000enhances BIT1's I/O performance and storage capabilities, successfully\u0000introducing high throughput parallel I/O and surpassing the capabilities of\u0000traditional file I/O.","PeriodicalId":501274,"journal":{"name":"arXiv - PHYS - Plasma Physics","volume":"13 1","pages":""},"PeriodicalIF":0.0,"publicationDate":"2024-08-06","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"141941372","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

Suppression of Edge Localized Modes in ITER Baseline Scenario in EAST using Edge Localized Magnetic Perturbations 利用边缘局部磁扰动抑制 EAST 中 ITER 基准方案的边缘局部模态

arXiv - PHYS - Plasma Physics Pub Date : 2024-08-06 DOI: arxiv-2408.03272

P. Xie, Y. Sun, M. Jia, A. Loarte, Y. Q. Liu, C. Ye, S. Gu, H. Sheng, Y. Liang, Q. Ma, H. Yang, C. A. Paz-Soldan, G. Deng, S. Fu, G. Chen, K. He, T. Jia, D. Lu, B. Lv, J. Qian, H. H. Wang, S. Wang, D. Weisberg, X. Wu, W. Xu, X. Yan, Y. Yu, Q. Zang, L. Zeng, T. Zhang, C. Zhou, Z. Zhou, B. Wan, the EAST Team

引用次数: 0

Wavenumber Calibration for an Imaging Refractometer 成像折射仪的波长校准

arXiv - PHYS - Plasma Physics Pub Date : 2024-08-05 DOI: arxiv-2408.02660

A. Rososhek, B. R. Kusse, W. M. Potter, N. J. Wilson, E. S. Lavine, D. A. Hammer

引用次数: 0

Tomographic diffractometry of laser-induced plasma formations 激光诱导等离子体形成的断层衍射仪

arXiv - PHYS - Plasma Physics Pub Date : 2024-08-05 DOI: arxiv-2408.02772

Ivan Ostrovsky, Gilad Hurvitz, Eli Bograd, Eli Flaxer, Soumitra Hazra, Sharly Fleischer

引用次数: 0

Long-living Equilibria in Kinetic Astrophysical Plasma Turbulence 动力学天体物理等离子体湍流中的长效平衡

arXiv - PHYS - Plasma Physics Pub Date : 2024-08-05 DOI: arxiv-2408.02656

Mario Imbrogno, Claudio Meringolo, Sergio Servidio, Alejandro Cruz-Osorio, Benoît Cerutti, Francesco Pegoraro

{"title":"Long-living Equilibria in Kinetic Astrophysical Plasma Turbulence","authors":"Mario Imbrogno, Claudio Meringolo, Sergio Servidio, Alejandro Cruz-Osorio, Benoît Cerutti, Francesco Pegoraro","doi":"arxiv-2408.02656","DOIUrl":"https://doi.org/arxiv-2408.02656","url":null,"abstract":"Turbulence in classical fluids is characterized by persistent structures that\u0000emerge from the chaotic landscape. We investigate the analogous process in\u0000fully kinetic plasma turbulence by using high-resolution, direct numerical\u0000simulations in two spatial dimensions. We observe the formation of long-living\u0000vortices with a profile typical of macroscopic, magnetically dominated\u0000force-free states. Inspired by the Harris pinch model for inhomogeneous\u0000equilibria, we describe these metastable solutions with a self-consistent\u0000kinetic model in a cylindrical coordinate system centered on a representative\u0000vortex, starting from an explicit form of the particle velocity distribution\u0000function. Such new equilibria can be simplified to a Gold-Hoyle solution of the\u0000modified force-free state. Turbulence is mediated by the long-living\u0000structures, accompanied by transients in which such vortices merge and form\u0000self-similarly new metastable equilibria. This process can be relevant to the\u0000comprehension of various astrophysical phenomena, going from the formation of\u0000plasmoids in the vicinity of massive compact objects to the emergence of\u0000coherent structures in the heliosphere.","PeriodicalId":501274,"journal":{"name":"arXiv - PHYS - Plasma Physics","volume":"3 1","pages":""},"PeriodicalIF":0.0,"publicationDate":"2024-08-05","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"141941374","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

Characterizing the Performance of the Implicit Massively Parallel Particle-in-Cell iPIC3D Code 鉴定隐式大规模并行 "单元内粒子 "iPIC3D 代码的性能

arXiv - PHYS - Plasma Physics Pub Date : 2024-08-04 DOI: arxiv-2408.01983

Jeremy J. Williams, Daniel Medeiros, Ivy B. Peng, Stefano Markidis

引用次数: 0

Large-Angle Collisions in Burning Plasmas of Inertial Confinement Fusions 惯性约束聚变燃烧等离子体中的大角度碰撞

arXiv - PHYS - Plasma Physics Pub Date : 2024-08-04 DOI: arxiv-2408.01948

Y. H. Xue, D. Wu, J. Zhang

{"title":"Large-Angle Collisions in Burning Plasmas of Inertial Confinement Fusions","authors":"Y. H. Xue, D. Wu, J. Zhang","doi":"arxiv-2408.01948","DOIUrl":"https://doi.org/arxiv-2408.01948","url":null,"abstract":"A recent neutron analysis of experiments conducted at the National Ignition\u0000Facility (NIF) has revealed deviations from the Maxwellian distributions in the\u0000ion relative kinetic energy of burning plasmas, with the surprising emergence\u0000of supra-thermal deuterium and tritium (DT) ions that fall outside the\u0000predictions of macroscopic statistical hydrodynamic models. Our\u0000hybrid-particle-in-cell simulations, incorporating the newly-developed model of\u0000large-angle collisions, suggest this could be attributed to the increased\u0000significance of large-angle collisions among DT ions and (alpha)-particles\u0000in the burning plasma. Extensive investigations into the implications of\u0000large-angle collisions in the burning plasma have yield several key findings,\u0000including an ignition moment promotion by (sim 10, {rm ps}), the presence\u0000of supra-thermal ions below an energy threshold, and a hotspot expansion rate\u0000about six times faster than expected. Furthermore, we have established the\u0000congruency between the NIF neutron spectral moment analysis and our\u0000simulations. Our researches on large-angle collisions in burning plasmas offer\u0000new insights for experiment interpretation and update our understanding for new\u0000designs of inertial confinement fusions.","PeriodicalId":501274,"journal":{"name":"arXiv - PHYS - Plasma Physics","volume":"30 1","pages":""},"PeriodicalIF":0.0,"publicationDate":"2024-08-04","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"141941376","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