Effects of Laser Parameters on Fast Electron Generation in a Multihole Array Target

Abstract

The effects of laser parameters on the production of fast electrons from laser-multihole array target interaction are investigated theoretically via two-dimensional particle-in-cell simulations. The results show that the fast electron temperature is scaled by 𝐼 1/2 𝜆 2 with 𝐼 and 𝜆 being the laser intensity and wavelength. When the laser intensity reaches 2.14 × 10 20 W•cm −2 , a typical bi-Maxwellian energy distribution is observed. The slope temperature of the low-energy component fits the linear scaling 𝑇 ℎ ∼ 𝐼 1/2 well. The high-energy component has an increased slope temperature comparable to ponderomotive potential scaling law. In addition, the electron temperature rises linearly with the pulse duration, 𝑇 ℎ ∼ Δ𝑡. The divergence angle of the fast electrons increases with laser intensity and pulse duration, but is independent of laser wavelength.

K -Shell Spectra from CH-Tamped Aluminum Layers Irradiated with Intense Femtosecond Laser Pulses

“…The interaction of intense ultrashort laser pulses with solid targets allows the generation of plasmas with high density and high temperature up to a few of 100 eV. Such plasmas are of particular interest in various fields such as physics, [1,2] astronomy, [3] chemistry and biology. On the one hand, it can be used to reveal the mystery in atomic physics, such as the x-ray opacity of matter in stellar interiors, [4] strong plasma effects on the atomic energy levels, the thermal electron, [2,5] particle fluxes [6] and inertial confinement fusion (ICF).…”

“…Such plasmas are of particular interest in various fields such as physics, [1,2] astronomy, [3] chemistry and biology. On the one hand, it can be used to reveal the mystery in atomic physics, such as the x-ray opacity of matter in stellar interiors, [4] strong plasma effects on the atomic energy levels, the thermal electron, [2,5] particle fluxes [6] and inertial confinement fusion (ICF). [7,8] On the other hand, this ultrashort laser plasmas have the potential application as compactness, flexibility, low cost and high repetition rate ultrashort x-ray source which obtains great interesting in medical imaging and material science.…”