Electron–positron pair production from vacuum in an electromagnetic field created by two counterpropagating focused laser pulses interacting with each other is analyzed. The dependence of the number of produced pairs on the intensity of a laser pulse and the focusing parameter is studied with a realistic three-dimensional model of the electromagnetic field of the focused wave, which is an exact...

The pathology of shell shock, contemporaneously referred to as post-traumatic stress disorder, has been identified by researchers. Why the brain injury occurs primarily inthe frontal lobes and its ‘distinctive honeycomb pattern of broken and swollen nerve fibres’ was not identified. Every munitions explosion emits a broadband pulse of electromagnetic energy. The electromagnetic energy pulse rea...

and electron plasma frequency, respectively, and b b v c is the directed ion beam velocity normalized to the speed of light. The electromagnetic field perturbations excited by the ion beam pulse in this regime are calculated analytically, and verified by comparison with the numerical simulations. The degrees of beam charge neutralization and current neutralization are estimated, and the transv...

We report on the study of the time-space localized solutions to Maxwell’s equations with toroidal topology that have intriguing properties and interact with interfaces and nanostructures in a peculiar fashion. The ‘Focused Doughnut’ (FD) pulse is an exact, finite-energy electromagnetic perturbation with a uniquespatio-temporal structure that is toroidal in character (Fig. 1) [1]. In contras...

Simulations based on electromagnetic topology (EMT) have been carried out to analyze an external electromagnetic pulse interaction with a shielded coaxial cable linking two systems together. The proposed EMT approach, combined with the SPICE model of the shielded cable, can be applied in the transient simulation directly and used for the electromagnetic interference analysis of systems includin...

This article proposes a novel mean for tuning the natural frequency of an electromagnetic resonant shunt, using pulse-width modulation (PWM) circuit. It is used to modulate value capacitance and electrical shown be proportional command parameter PWM, duty cycle. An easy efficient strategy tune shunt in real time then proposed, thus obtaining low powered always stable vibration control device. T...

We investigate the development of electromagnetic cascades in ice using a GEANT Monte Carlo simulation. We examine the Cherenkov pulse that is generated by the charge excess that develops and propagates with the shower. This study is important for the RICE experiment at the South Pole, as well as any test beam experiment which seeks to measure coherent Cherenkov radiation from an electromagneti...