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  1. ui.adsabs.harvard.edu

    The dynamics of pulsar's polar cap cascade, based on the Ruderman-Sutherland model, has been investigated for the first time numerically in one dimension by Timokhin. ... we present the results of one and two dimensional QED-PIC simulations of the development of electromagnetic cascades at the surface of the polar cap and the subsequent plasma ...
    Author:Thomas Grismayer, Marija Vranic, Ricardo Fonseca, Luis SilvaPublished:2016
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  3. Jan 18, 2024This paper aims to investigate the effect of photon polarization during the QED cascade occurring over the polar cap of a pulsar. We employ a Monte Carlo-based QED algorithm that accurately accounts for both spin and polarization effects during photon emission and pair production in both single-particle and particle-in-cell (PIC) simulations.
  4. academic.oup.com

    Apr 9, 2024Schematic representation of the polarized QED cascade over a pulsar polar cap. High-energy e ± particles, drifting in the curved magnetic field, emit γ ∥ photons through CR, which subsequently convert into e ± pairs. The resulting e ± pairs can emit both γ ∥ and γ ⊥ photons via SR. The symbols γ ∥ and γ ⊥ denote photons polarized parallel and perpendicular to the plane of the ...
  5. iopscience.iop.org

    We perform 2D QED-PIC simulations with the code OSIRIS (Fonseca et al. 2002, 2008) in axisymmetric cylindrical coordinates (R, z).The lower z boundary (z = 0) is a rotating conducting disk of radius R 0.The reference scale R 0 should be interpreted as the polar cap radius, and the z-axis as the magnetic (and rotation) axis of the neutron star.The rotation of the conducting disk is imposed by ...
    Author:Fábio Cruz, Thomas Grismayer, Alexander Y. Chen, Anatoly Spitkovsky, Luis O. SilvaPublished:2021
  6. bohrium.dp.tech

    Apr 9, 2024It is furthermore still uncertain from where the radio emission emanates in polar cap region. We investigate the generation of electromagnetic waves by pair cascades and their propagation in the polar cap for three representative inclination angles of a magnetic dipole, $0^\circ$, $45^\circ$, and $90^\circ$. 2D particle-in-cell simulations that ...
  7. iopscience.iop.org

    2. QED-PIC Simulations We perform 2D QED-PIC simulations with the code OSIRIS (Fonseca et al. 2002, 2008) in axisymmetric cylindrical coordinates (R, z).Thelowerz boundary (z=0) is a rotating conducting disk of radius R 0. The reference scale R 0 should be interpreted as the polar cap radius, and the z-axis as the magnetic
  8. Jan 18, 2024The polarized QED cascade process over a pulsar polar cap is illustrated in Fig. 1.High-energy e ± superscript 𝑒 plus-or-minus e^{\pm} italic_e start_POSTSUPERSCRIPT ± end_POSTSUPERSCRIPT, accelerated by the electric field, are confined to move along the curved magnetic field lines with minimal pitch angles, emitting γ 𝛾 \gamma italic_γ photons through curvature radiation (CR).
  9. absimage.aps.org

    sion, we present the results of one and two dimensional QED-PIC simulations of the development of electromagnetic cascades at the surface of the polar cap and the subsequent plasma discharges that are accompanied by strong electrostatic waves. [1] M. Vranic et al., NJP, in press (2016) [2] T. Grismayer et al., Physics of Plasmas 23, 056706 ...
  10. ar5iv.labs.arxiv.org

    The driving mechanism of these cascades is the emission of gamma-ray photons and their conversion into pairs via Quantum Electrodynamics (QED) processes. In this work, we present 2D particle-in-cell simulations of pair cascades in pulsar polar caps with realistic magnetic field geometry that include the relevant QED processes from first principles.
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