Energetic proton acceleration and bunch generation by ultraintense laser pulses on the surface of thin plasma targets

Abstract

Energetic proton acceleration from concave targets, the front of which were irradiated with 40 fs laser pulses with an intensity of 10(20)W/cm(2), has been studied as a function of the depth of the concave shape. Three kinds of targets, a triangular concave target, a circular concave target and a parabolic concave target are considered. When the depth of the concave shape was varied, the peak proton energy showed a maximum. The underlying mechanism for the existence of a maximum peak proton energy is presented by tracing the proton trajectory. It is concluded that a parabolic concave target is the best, among the targets considered, for accelerating a proton beam, since a proton beam from a parabolic concave target goes through the strongest electric field.

Investigations of Field Dynamics in Laser Plasmas with Proton Imaging

“…Pulse duration τ L and spectral bandwidth ∆ω p are connected by: 11) due to the Fourier transformation (Eq. 1.1 and 1.2).…”

“…By using curved targets the emission angle of the ion beam can be influenced. Concave targets can focus or collimate the whole ion beam [1,[10][11][12]. To achieve tailored spectra, especially monoenergetic ion beams, different approaches exist.…”

“…Recent investigations show that the ion beam can be manipulated by the use of special targets. Concave targets focus or collimate the whole ion beam [1,[10][11][12]. Manipulated target surfaces or microstructured targets can deliver quasi-monoenergetic ion and proton beams [13,14].…”

Spectral control in quasi-monoenergetic proton generation with double foil target

“…Nowadays, generation of quasi-monoenergetic ion beam is one of the critical issues in the laser produced high energy ion generation [1][2][3][4][5][6]. High-energy (>Mev) ions have been observed in the experiments and numerical simulations.…”

“…Many approaches have been proposed to reduce the emittance and energy spread of ion beam, by using the microstructured or deformed targets [2][3][4], or using ultrafast laser-driven microlens [5].…”