On the physics of electron ejection from laser-irradiated overdense plasmas

Study of Laser-Hole Boring into Overdense Plasmas.

the effect of traffic density on the accident externality from driving the case study of tehran

در این پژوهش به بررسی اثر افزایش ترافیک بر روی تعداد تصادفات پرداخته شده است. به این منظور 30 تقاطع در شهر تهران بطور تصادفی انتخاب گردید و تعداد تصادفات ماهیانه در این تقاطعات در طول سالهای 89-90 از سازمان کنترل ترافیک شهر تهران استخراج گردید و با استفاده از مدل داده های تابلویی و نرم افزار eviews مدل خطی و درجه دوم تخمین زده شد و در نهایت این نتیجه حاصل شد که تقاطعات پر ترافیک تر تعداد تصادفا...

Coherent wake emission of high-order harmonics from overdense plasmas.

We present a new mechanism for high-order harmonic generation by reflection of a laser beam from an overdense plasma, efficient even at moderate laser intensities (down to Igamma2 approximately 4x10(15) W cm-2 microm2). In this mechanism, a transient phase matching between the electromagnetic field and plasma oscillations within a density gradient leads to the emission of harmonics up to the pl...

Nonlinear physics of laser - irradiated micro - clusters

Abstract A nonlinear theory has been developed to describe electron response and ion acceleration in dense clusters that are smaller in size than the laser wavelength. This work is motivated by high-intensity laser-cluster interaction experiments. The theory reveals that the breakdown of quasi-neutrality affects the cluster dynamics in a dramatic way: the laser can create a positively charged i...

Laser Irradiated Enhancement of the Atomic Electron Capture Rate in search of New Physics

Electron capture processes are important in the search for new physics. In this context, a high capture rate is desired. We investigate the possibility of enhancing the electron capture rate by irradiating laser beam to ”atom”. The possibility of such enhancement can be understood as a consequence of an enhancement of the electron wave function at the origin, Ψ(0), through an increased effectiv...