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Turbulence is often invoked to explain the origin of nonthermal particles in space and astrophysical plasmas. By means of 3D fully kinetic particle-in-cell simulations, we demonstrate that turbulence in low-$\beta$ plasmas ($\beta$ is the…

高能天体物理现象 · 物理学 2022-09-16 Luca Comisso , Lorenzo Sironi

We study the energy relaxation of quasiparticles in voltage biased mesoscopic wires in presence of magnetic impurities. The renormalization of the exchange interaction of Kondo impurities coupled to conduction electrons is extended to the…

介观与纳米尺度物理 · 物理学 2009-11-07 Georg Goeppert , Hermann Grabert

Test particle studies of electron scattering on ions, in an oscillatory electromagnetic field have shown that standard theoretical assumptions of small angle collisions and phase independent orbits are incorrect for electron trajectories…

等离子体物理 · 物理学 2009-11-07 A. Brantov , W. Rozmus , V. Yu. Bychenkov , V. T. Tikhonchuk , R. Sydora , C. E. Capjack

We use Monte Carlo approach to study the energetics of electrons accelerated in a pulsar polar gap. As energy-loss mechanisms we consider magnetic Compton scattering of thermal X-ray photons and curvature radiation. The results are compared…

天体物理学 · 物理学 2007-05-23 J. Dyks , B. Rudak

The properties of sputtered and scattered ions are studied for ion beam sputtering of Si by bombardment with noble gas ions. The energy distributions in dependence on ion beam parameters (ion energy: 0.5 - 1 keV; ion species: Ne, Ar, Xe)…

材料科学 · 物理学 2019-06-14 Dmitry Kalanov , André Anders , Carsten Bundesmann

We examine the fate of fast electrons (with energies E>10 eV) in a thermal gas of primordial composition. To follow their interactions with the background gas, we construct a Monte Carlo model that includes: (1) electron-electron scattering…

宇宙学与河外天体物理 · 物理学 2015-05-14 Steven Furlanetto , Samuel Johnson Stoever

Very low-energy scattering of orthopositronium by helium has been investigated for simultaneous study of elastic cross section and pick-off quenching rate using a model exchange potential. The present calculational scheme, while agrees with…

原子与分子团簇 · 物理学 2009-10-31 Sadhan K. Adhikari , P. K. Biswas , R. A. Sultanov

We study the relaxation of a non-equilibrium carrier distribution under the influence of the electron-electron interaction in the presence of disorder. Based on the Anderson model, our Hamiltonian is composed from a single particle part…

无序系统与神经网络 · 物理学 2008-02-15 Peter Bozsoki , Imre Varga , Henning Schomerus

The photon flux resulting from high-energy electron beam interactions with high field systems, such as in the upcoming FACET-II experiments at SLAC National Accelerator Laboratory, may give deep insight into the electron beam's underlying…

加速器物理 · 物理学 2023-09-26 M. Yadav , M. Oruganti , S. Zhang , B. Naranjo , G. Andonian , Y. Zhuang , Ö. Apsimon , C. P. Welsch , J. B. Rosenzweig

The energy distributions of secondary electrons produced by energetic carbon ions (in the energy range used, e.g., in hadron therapy), incident on liquid water, are discussed. For low-energy ions, a new parameterization of the…

生物物理 · 物理学 2015-05-14 Emanuele Scifoni , Eugene Surdutovich , Andrey V. Solov'yov

Energy spectra and angular distributions have been measured of electrons that are emitted upon disassembly of $Xe_{150000}$ following irradiation by intense (10$^{15}-10^{16}$ W cm$^{-2}$) laser pulses whose durations are varied over the…

原子与分子团簇 · 物理学 2009-11-07 V. Kumarappan , M. Krishnamurthy , D. Mathur

Peierls gap is analyzed in case of a two-dimensional lattice under the influence of a magnetic field, in a tight-binding approximation. By using a non-analytic class of potentials, such as the Kohmoto potential in the Harper model,…

介观与纳米尺度物理 · 物理学 2009-06-19 O. Borchin

High quality electron beams, with high spatial and tempo- ral resolution, have an important use in electron diffraction experiments to probe and study the constituents of matter. A cold electron source is being developed based on elec- tron…

加速器物理 · 物理学 2015-05-12 R Appleby , W. Bertsche , M. Harvey , M. Jones , B. Kyle , O. Mete , A. Murray , G. Xia

The low energy excitations in Na2IrO3 have been investigated using resonant inelastic x-ray scattering (RIXS). A magnetic excitation branch can be resolved, whose dispersion reaches a maximum energy of about 35 meV at the \Gamma-point. The…

Electron and ion energization (i.e., heating and nonthermal acceleration) is a fundamental, but poorly understood, outcome of plasma turbulence. In this work, we present new results on this topic from particle-in-cell simulations of driven…

高能天体物理现象 · 物理学 2019-02-13 Vladimir Zhdankin , Dmitri A. Uzdensky , Gregory R. Werner , Mitchell C. Begelman

We study the relaxation dynamics of laser-excited non-equilibrium electron distributions in the valence- and conduction band of a dielectric. We apply Boltzmann collision integrals to trace the influence of different scattering mechanisms…

统计力学 · 物理学 2023-04-28 Nils Brouwer , Steffen Hirtle , Baerbel Rethfeld

By choosing an electron gas resting instead of drifting in the laboratory coordinate system as the initial state, the first order perturbation calculation of the previous paper (Phys. Stat. Sol. (b) 198, 785(1996)) is revised and extended…

统计力学 · 物理学 2009-10-30 Hang-Sheng Wu , Xian-Xiang Huang , Qi-Ming Weng

Magnetic reconnection is a leading mechanism for dissipating magnetic energy and accelerating nonthermal particles in Poynting-flux dominated flows. In this letter, we investigate nonthermal particle acceleration during magnetic…

高能天体物理现象 · 物理学 2016-02-17 Fan Guo , Xiaocan Li , Hui Li , William Daughton , Bing Zhang , Nicole Lloyd-Ronning , Yi-Hsin Liu , Haocheng Zhang , Wei Deng

We investigate evolution of the intracluster medium (ICM), considering the relaxation process between the ions and electrons. According to the standard scenario of structure formation, ICM is heated by the shock in the accretion flow to the…

天体物理学 · 物理学 2009-10-30 Motokazu Takizawa

The low-energy spectra of gamma-ray bursts' (GRBs) prompt emission are closely related to the energy distribution of electrons, which is further regulated by their cooling processes. We develop a numerical code to calculate the evolution of…

高能天体物理现象 · 物理学 2018-01-16 Jin-Jun Geng , Yong-Feng Huang , Xue-Feng Wu , Bing Zhang , Hong-Shi Zong