Analytic treatment of the relativistic motion of charged particles in electric and magnetic field

Giovanelli, Raffaele

doi:10.1007/bf02456999

Cited by 4 publications

(2 citation statements)

References 2 publications

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“…The advent of a similar seven feed array at Arecibo ("ALFA", the Arecibo L-band Feed Array) has enabled a second-generation wide area extragalactic HI line survey, ALFALFA, the Arecibo Legacy Fast ALFA survey (Giovanelli et al 2005a,b;Giovanelli 2008;Haynes 2008). Initiated in February 2005, survey observations are now more than 90% complete.…”

Section: Introductionmentioning

confidence: 99%

The ARECIBO LEGACY FAST ALFA SURVEY: THE α.40 H I SOURCE CATALOG, ITS CHARACTERISTICS AND THEIR IMPACT ON THE DERIVATION OF THE H I MASS FUNCTION

Haynes

Giovanelli

Martin

et al. 2011

The Astronomical Journal

608

264

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We present a current catalog of 21 cm HI line sources extracted from the Arecibo Legacy Fast Arecibo L-band Feed Array (ALFALFA) survey over ∼2800 deg 2 of sky: the α.40 catalog. Covering 40% of the final survey area, the α.40 catalog contains 15855 sources in the regionsOf those, 15041 are certainly extragalactic, yielding a source density of 5.3 galaxies per deg 2 , a factor of 29 improvement over the catalog extracted from the HI Parkes All Sky Survey. In addition to the source centroid positions, HI line flux densities, recessional velocities and line widths, the catalog includes the coordinates of the most probable optical counterpart of each HI line detection, and a separate compilation provides a crossmatch to identifications given in the photometric and spectroscopic catalogs associated with the Sloan Digital Sky Survey Data Release 7. Fewer than 2% of the extragalactic HI line sources cannot be identified with a feasible optical counterpart; some of those may be rare OH megamasers at 0.16 < z <0.25. A detailed analysis is presented of the completeness, width dependent sensitivity function and bias inherent of the α.40 catalog. The impact of survey selection, distance errors, current volume coverage and local large scale structure on the derivation of the HI mass function is assessed. While α.40 does not yet provide a completely representative sampling of cosmological volume, derivations of the HI mass function using future data releases from ALFALFA will further improve both statistical and systematic uncertainties.

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Section: Introductionmentioning

confidence: 99%

The ARECIBO LEGACY FAST ALFA SURVEY: THE α.40 H I SOURCE CATALOG, ITS CHARACTERISTICS AND THEIR IMPACT ON THE DERIVATION OF THE H I MASS FUNCTION

Haynes

Giovanelli

Martin

et al. 2011

The Astronomical Journal

608

264

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“…This is unacceptable for our investigation of neutron star magnetospheres. Giovanelli (1987) showed how to use exact analytical solutions in constant electromagnetic fields to construct new particle pushers by transformations to appropriate frames where electric and magnetic fields are parallel. Our ideas follow the same line with an extensive test of the algorithm in several geometric configurations.…”

Section: Introductionmentioning

confidence: 99%

A relativistic particle pusher for ultra-strong electromagnetic fields

Pétri

2020

J. Plasma Phys.

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Kinetic plasma simulations are nowadays commonly used to study a wealth of nonlinear behaviours and properties in laboratory and space plasmas. In particular, in high-energy physics and astrophysics, the plasma usually evolves in ultra-strong electromagnetic fields produced by intense laser beams for the former or by rotating compact objects such as neutron stars and black holes for the latter. In these ultra-strong electromagnetic fields, the gyro-period is several orders of magnitude smaller than the time scale on which we desire to investigate the plasma evolution. Some approximations are required such as, for instance, artificially decreasing the electromagnetic field strength, which is certainly not satisfactory. The main flaw of this downscaling is that it cannot reproduce particle acceleration to ultra-relativistic speeds with a Lorentz factor above $\gamma \approx 10^3$ – $10^4$ . In this paper, we design a new algorithm able to catch particle motion and acceleration to a Lorentz factor of up to $10^{15}$ or even higher by using Lorentz boosts to special frames where the electric and magnetic field are parallel. Assuming that these fields are locally uniform in space and constant in time, we solve analytically the equation of motion in a tiny region smaller than the length scale of the spatial and temporal gradient of the field. This analytical integration of the orbit severely reduces the constraint on the time step, allowing us to use large time steps, avoiding resolving the ultra-high gyro-frequency. We performed simulations in ultra-strong spatially and time-dependent electromagnetic fields, showing that our particle pusher is able to follow accurately the exact analytical solution for very long times. This property is crucial to properly capture for instance lepton electrodynamics in electromagnetic waves produced by fast rotating neutron stars. We conclude with a simple implementation of our new pusher into a one-dimensional relativistic electromagnetic particle-in-cell code, testing it against plasma oscillations, two-stream instabilities and strongly magnetized relativistic shocks.

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Relativistic electron motion in FEL-like fields taking retarded interactions into account

Giovanelli

1993

Il Nuovo Cimento D

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Analytic treatment of the relativistic motion of charged particles in electric and magnetic field

Cited by 4 publications

References 2 publications

The ARECIBO LEGACY FAST ALFA SURVEY: THE α.40 H I SOURCE CATALOG, ITS CHARACTERISTICS AND THEIR IMPACT ON THE DERIVATION OF THE H I MASS FUNCTION

The ARECIBO LEGACY FAST ALFA SURVEY: THE α.40 H I SOURCE CATALOG, ITS CHARACTERISTICS AND THEIR IMPACT ON THE DERIVATION OF THE H I MASS FUNCTION

A relativistic particle pusher for ultra-strong electromagnetic fields

Relativistic electron motion in FEL-like fields taking retarded interactions into account

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