Abstract
The effect of the frequency variation of laser pulse in uniform magnetized plasma is considered in one-dimensional laser wakefield acceleration and carried out particle simulation. It is shown that wakefield amplitude is increased threefold for the negative Gaussian chirped laser pulse in the magnetized plasma. In our simulation, electrons with initial energy about 0.3 MeV with initial energy spread about 10 % were trapped, effectively compressed in longitudinal direction and accelerated to ultra-relativistic energy about 1.3 GeV with final energy spread about 6 %.
Highlights
The effect of the frequency variation of laser pulse in uniform magnetized plasma is considered in onedimensional laser wakefield acceleration and carried out particle simulation
Several techniques have been proposed to this end, including the use of microwave pulses [13,14,15] through changing pulse shape [16, 17], through using tapered plasma channel [18, 19] and chirped laser pulse [20, 21], and through external magnetic field [24,25,26,27], this paper explores the use of chirped laser pulse along with external magnetic field to excite wakefield
The effect of the Gaussian chirped laser pulse in uniform magnetized plasma is considered in one dimensional laser wakefield acceleration (LWFA)
Summary
A E circularlyhpoÀlarized 1⁄4 E0 exp À ðz À z0 laser À vg tpÞ=urlszeÁ2wiÂith frequency chirped; fx^ Cos ðkðz À z0ÞÀ x tÞ þ y^ Sin ðkðz À z0Þ À x tÞg; is considered to propagate at positive z direction in homogeneous plasma. For dilute under dense plasma xp=x\\1; all of the axial and time dependencies of the laser pulse can be expressed as a function of a single variable n 1⁄4 z À vgt, where vg is the group velocity of the laser pulse In terms of this variable the electric field of the chirped laser pulse can be described by. 1⁄4 vif c ði 1⁄4 x; y; zÞ are the normalized velocity components, ~a 1⁄4 e~A=mec is the normalized vector potential of chirped laser pulse, and x~c 1⁄4. Equations (18–22) describe excitation of plasma waves in the presence of the axial magnetic field and frequency variation of the laser pulse. At first, we obtain profile of the vector potential of the laser pulse with Gaussian frequency variation and solve simultaneously, Eqs. At first, we obtain profile of the vector potential of the laser pulse with Gaussian frequency variation and solve simultaneously, Eqs. (18–21) by fourth order Runge–Kutta method
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