144 / 2025-03-15 20:06:25

Numerical Study on Positron Production via Ultrashort-Ultraintense Laser Irradiation of Tapered Microstructured Targets

Positron Production,PIC-MCC Simulation,SPW

A novel scheme utilizing ultra-short ultra-intense laser irradiation of a cone-shaped target with micro-wire array for positron generation has been proposed. By employing Three-dimensional Particle-In-Cell (PIC) and Monte Carlo simulation techniques, it was observed that the laser pulse excites strong surface plasma waves (SPW) near the micro-wire array. The longitudinal SPW field drives electron acceleration and bunching, forming a quasi-monoenergetic high-energy electron beam. This beam is then used to bombard a high-Z converter to generate positrons. Compared to a planar target, our scheme can produce higher positron yield and energy.