The dynamics of an electron bunch irradiated by two focused colliding super-intense laser pulses and the resulting γ and e − e + production are studied. Due to attractors of electron dynamics in a standing wave created by colliding pulses the photon emission and pair production, in general, are more efficient with linearly polarized pulses than with circularly polarized ones. The dependence of the key parameters on the laser intensity and wavelength allows to identify the conditions for the cascade development and γe − e + plasma creation. With the advent of 10 PW laser facilities, the new and so far unexplored field of ultra-intense laser matter interaction will become accessible experimentally [1]. The intensities of the order of 10 23−24 W/cm 2 will be achieved in these interactions, therefore the possibility of efficient generation of gamma-ray photons or even electronpositron pairs has attracted much attention in the last decade (see review article [2] and references therein). In a strong electromagnetic field, electrons can be accelerated to such high energy that the radiation reaction starts to play an important role [3]. Moreover, a new regime of the interaction can be entered, dominated by quantum electrodynamics (QED) effects such as pair production and cascade development [2,4]. If a photon with sufficient energy is emitted due to multiphoton Compton scattering and then interacts with n laser photons, new electron-positron pair can be created via the multiphoton Breit-Wheeler process [5]. Since the probabilities of the photon emission and pair creation depend on the particle momentum, on the electromagnetic field strength, and on their mutual orientation, it is necessary to elucidate the motion of electrons (positrons) in the electromagnetic field in the strong radiation reaction regime.In this Letter we present the analysis of the electron motion and photon emission modeled as a discreet process in the electromagnetic (EM) standing wave (SW) generated by two colliding focused short super-intense laser pulses interacting with an electron bunch. The interaction of charged particles with an intense EM fields is characterized by two dimensionless relativistically invariant parameters [6]. First parameter is a 0 = eE 0 /m e ω 0 c, the dimensionless EM field amplitude, which measures the energy gain of an electron over the field wavelength in units of 2πm e c 2 . It is often referred to as the classical nonlinearity parameter. Here e and m e are the electron charge and mass, E and ω 0 are EM field strength and frequency, c is the speed of light, respectively. The second parameter is, where E S = m 2 e c 3 /e ≃ 1.3 × 10 18 V/m [7], is the Planck constant, and F µν is the EM field tensor. The parameter χ e,γ characterizes the interaction of electrons (positrons) and photons with the EM field. Depending on the energy of charged particles and field strength the interaction happens in one of the following regimes parametrized by a 0 and χ e,γ : (i) a 0 > 1, the electron dynamics is relativistic; (ii) a 0 > ǫ −1...
ELI-Beamlines (ELI-BL), one of the three pillars of the Extreme Light Infrastructure endeavour, will be in a unique position to perform research in high-energy-density-physics (HEDP), plasma physics and ultra-high intensity (UHI) (1022W/cm2) laser–plasma interaction. Recently the need for HED laboratory physics was identified and the P3 (plasma physics platform) installation under construction in ELI-BL will be an answer. The ELI-BL 10 PW laser makes possible fundamental research topics from high-field physics to new extreme states of matter such as radiation-dominated ones, high-pressure quantum ones, warm dense matter (WDM) and ultra-relativistic plasmas. HEDP is of fundamental importance for research in the field of laboratory astrophysics and inertial confinement fusion (ICF). Reaching such extreme states of matter now and in the future will depend on the use of plasma optics for amplifying and focusing laser pulses. This article will present the relevant technological infrastructure being built in ELI-BL for HEDP and UHI, and gives a brief overview of some research under way in the field of UHI, laboratory astrophysics, ICF, WDM, and plasma optics.
The intensities of the order of 1023–24 W/cm2 are required to efficiently generate electron-positron pairs in laser-matter interaction when multiple laser beam collision is employed. To achieve such intense laser fields with the upcoming generation of 10 PW laser beams, focusing to sub-micron spot size is required. In this paper, the possibility of pair production cascade development is studied for the case of a standing wave created by two tightly focused colliding laser pulses. Even though the stronger ponderomotive force expels the seed particles from the interaction volume when a tightly focused laser beam is used, tight focusing allows to achieve cascade pair production due to the higher intensity in the focal spot. Optimizing the target density can compensate the expulsion by the ponderomotive force and lower the threshold power required for cascade pair production. This will in principle allow to produce pairs with 10 PW-class laser facilities which are now under construction and will become accessible soon.
We study electron acceleration within a sub-critical plasma channel irradiated by an ultra-intense laser pulse (a0 > 100 or I > 10 22 W/cm 2). In this regime, radiation reaction significantly alters the electron dynamics. This has an effect not only on the maximum attainable electron energy but also on the phase-matching process between betatron motion and electron oscillations in the laser field. Our study encompasses analytical description, test-particle calculations and 2-dimensional particlein-cell simulations. We show single-stage electron acceleration to multi-GeV energies within a 0.5 mm-long channel and provide guidelines how to obtain energies beyond 10 GeV using optimal initial configurations. We present the required conditions in a form of explicit analytical scaling laws that can be applied to plan the future electron acceleration experiments.
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