High-Intensity Laser–Matter Interaction

Schwoerer, H.

doi:10.1007/3-540-30272-7_2

Cited by 6 publications

(9 citation statements)

References 25 publications

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“…The first observation of the ponderomotive effect was reported in 1957 [41]. The PMF is a low-frequency phenomenon induced by a high-frequency field in which charged particles tend to be expelled from the regions of strong field in the opposite direction to the intensity gradient [42,43]. The PMF is an average of the electromagnetic Lorentz force over a period, taking into account changes of the wave amplitude over the particle's orbit.…”

Section: Ponderomotive Forcementioning

confidence: 99%

Explicit general solutions to relativistic electron dynamics in plane-wave electromagnetic fields and simulations of ponderomotive acceleration

Yang¹,

Craxton²,

Haines³

2011

Plasma Phys. Control. Fusion

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This study examines single-particle electron motions in both a plane electromagnetic wave and a Gaussian focus in vacuum. Exact, explicit analytic expressions for relativistic electron trajectories in a plane wave are obtained, using the proper time as a parameter, in the general case of arbitrary initial positions and velocities. It is shown that previous analyses can be completed using the proper-time parameter. The conditions under which localized oscillatory motions ('figure-of-eight' orbits) occur are derived from the new solutions. The general solutions are also connected with the figure-of-eight orbits by a Lorentz transformation. The analytic solutions for arbitrary initial conditions and an arbitrary initial field phase can be used to determine the ranges of electron ejection angle and emerging electron energy in a vacuum laser accelerator, in which electrons are ejected externally, and provide a basis for explaining the spectrum of nonlinear Thomson scattering radiation. Numerical solutions are used for electron motions in the focus of a Gaussian laser beam, and the mean motion allows one to test a new expression for the relativistic ponderomotive force. It is suggested that plane wave solutions can provide a basis for approximating the orbital motion of particles in Gaussian beams.

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Section: Ponderomotive Forcementioning

confidence: 99%

Explicit general solutions to relativistic electron dynamics in plane-wave electromagnetic fields and simulations of ponderomotive acceleration

Yang¹,

Craxton²,

Haines³

2011

Plasma Phys. Control. Fusion

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“…Attempts to modify α-decay rates were made soon after the discovery of radioactivity. In one of these experiments, Rutherford attempted a sudden change of temperature and pressure, up to 2500 • C and pressures of 100 MPa for a short period of time, and no effect was observed on the half-lives (as cited in [10]). This negative result could be explained in the Gamow picture of quantum mechanical tunnelling: the distortions or even removal of the electron cloud surrounding the mother nucleus caused by temperature, pressure, magnetic or gravitational fields produce a negligible effect on the Coulomb barrier, such that changes in the decay rate of the order of δλ/λ ≈ 10 −7 are expected [11].…”

Section: Introductionmentioning

confidence: 99%

α-Decay in ultra-intense laser fields

Mișicu¹,

Rizea²

2013

J. Phys. G: Nucl. Part. Phys.

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We investigate the α-decay of a spherical nucleus under the influence of an ultra-intense laser field for the case when the radius vector joining the centerof-masses of the α-particle and the daughter is aligned with the direction of the external field. The time-independent part of the α-daughter interaction is taken from elastic scattering compilations whereas the time-varying part describes the interaction between the decaying system with the laser field. The time-dependent Schrödinger equation is solved numerically by appealing to a modified scheme of the Crank-Nicolson type where an additional first-order time derivative appears compared to the field-free case. The tunneling probability of the α-cluster, and derived quantities (decay rate, total flux) is determined for various laser intensities and frequencies for either continous waves or few-cycle pulses of envelope function F (t) = 1. We show that in the latter case pulse sequences containing an odd number of half-cycles determine an enhancement of the tunneling probability compared to the field-free case and the continuous wave case. The present study is carried out taking as example the alpha decaying nucleus 106 Te.

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“…A variety of physical mechanisms of electron accelerations have been discussed depending on the laser and target conditions [20][21][22].…”

Section: Laser Accelerator and Laser Nuclear Physicsmentioning

confidence: 99%