Ion jet generation in the ultraintense laser interactions with rear-side concave target

Abstract

In this paper, the ion jet generation from the interaction of an ultraintense laser pulse and a rear-side concave target is investigated analytically using a simple fluid model. We find that the ion expanding surface at the rear-side is distorted due to a strong charge-separation field, and that this distortion becomes dramatic with a singular cusp shown on the central axis at a critical time. The variation of the transverse ion velocity and the relative ion density diverge on the cusp, signaling the emergence of an on-axis ion jet. We have obtained analytical expressions for the critical time and the maximum velocity of the ion jet, and suggested an optimum shape for generating a collimated energetic ion jet. The above theoretical analysis has been verified by particle-in-cell (PIC) numerical simulations.

Numerical study of ion acceleration and plasma jet formation in the interaction of an intense laser beam normally incident on an overdense plasma

“…In this paper, we present numerical simulations to study the case of a one-demensional (1D) model where a circularly polarized laser beam is normally incident on the surface of a target (oblique incidence and two-dimensional effects as recently reported for instance in Yang et al, 2010 andLiu et al, 2010, are beyond the scope of the present work). We consider the case when the free space wavelength of the wave λ 0 is much greater than the scale length of the ramp in the plasma density at the target plasma edge L edge (λ 0 ≫ L edge ), and the plasma density is such that n/n cr ≫ 1, where the critical density n cr = 1.1 × 10 21 λ 0 −2 cm −3 (λ 0 is the laser wavelength expressed in microns).…”

Self-similar solution of laser-produced plasma expansion into vacuum with kappa-distributed electrons

“…The ions can be accelerated by the charge separation in plasma created at the front side of the target [9] or at the back of the target [10]. The most interesting and effi cient one is the electrostatic acceleration at the rear side of a thin dense target.…”

Nucleation and growth of nanoparticles during pulsed laser deposition in an ambient gas

“…Intense laser beam interaction with solid surface has been investigated for many years, but it is still an attractive field (Chen et al, 2009;Liu et al, 2010;Okamuro et al, 2010;Wang et al, 2010) because more and more novel phenomena are discovered. It is used in processing of materials via pulsed laser ablation and has wide spread applications in such as particle beam generation (Bin et al, 2009), medical therapy (Linz & Alonso, 2007;Yogo et al, 2009), laser-induced nuclear reactions (Renner et al, 2008;Torrisi et al, 2008), diagnostics for laser-plasma interaction (MacKinnon et al, 2004), laser-driven ion accelerators (Badziak et al, 2001;Krushelnick et al, 2007;Malka et al, 2008;Mangles et al, 2006), proton radiography and imaging (Borghesi et al, 2002;Breschi et al, 2004;Cobble et al, 2002), fast ignition in inertial confinement fusion (Roth et al, 2001), and thin film deposition (Caridi et al, 2008;Wang et al, 2007).…”