Abstract
We investigate the effect of laser frequency chirp on the generation of a dense energetic electron sheet. The direct acceleration regime of laser driven dense electron sheet requires high laser intensity to function efficiently. We demonstrate this requirement can be relaxed by applying chirped lasers. The acceleration becomes more efficient while driven by a pulse with a proper linear chirp, leading to a dense energetic electron sheet in nanoscale, and therefore requires lower laser intensity.
Highlights
The rapid developments in laser technology have allowed the production of ultrashort and ultraintense lasers [1]
Let us study the evolution of a dense energetic electron sheet (DEES) in a chirped laser pulse over a finite interaction region 2 1⁄2ÀT; m, during which the DEES is accelerated from rest to the maximum energy ( 1⁄4 m)
To realize the nanocontrolled DEES driven by a chirped laser pulse, a second thick and dense reflect foil can be set at xr 1⁄4 40 behind the initial ultrathin foil [36], where the main accelerating stage (MAS) reaches the end under our simulation parameters
Summary
The rapid developments in laser technology have allowed the production of ultrashort and ultraintense lasers [1]. Even with a nanofoil target, a very sharp rising edge and high intensity are needed to avoid the heating and expansion effect of the electron sheet before the efficient acceleration [12] As a fact, this kind of single dense electron bunch could previously only be fulfilled by using nonadiabatic [13] or quasisingle cycle intense pulse [11]. It is worth mentioning that a DEES with density ne ) 1013 4x cmÀ3 is needed in this potential compact coherent x-ray generation regime [15] In this way, the DEES need to be controlled in nanoscale to keep its high density, while it is from a nanofoil with solid density, e.g., a nanomeshed graphene target.
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