Generation of fast protons in moderate-intensity laser–plasma interaction from rear sheath

Abstract

Forward fast protons are generated by the moderate-intensity laser-foil interaction. Protons with maximum energy 190 keV are measured by using magnetic spectrometer and CR-39 solid state track detectors along the direction normal to the rear surface. The experimental results are also modeled by the particle-in-cell method, investigating the timevarying electron temperature and the rear sheath field. The temporal and spatial structure of the sheath electrical field, revealed in the simulation, suggests that these protons are accelerated by target normal sheath acceleration (TNSA) mechanism.

Near-wall conductivity effect under a space—charge-saturated sheath in the Hall thruster

“…The research on hall thruster in China started late. However, there are still researches on the charaters of various sheaths [9][10][11][12][13][14][15][16][17][18][19][20] and researches on the charaters of plasma with 2D PIC [21,22] . During my research by the method of 2D particle simulation, it can be shown that the sheath is periodically oscillating [23] in the space when the electron temperature is higher.…”