Find Paper, Faster
Example:10.1021/acsami.1c06204 or Chem. Rev., 2007, 107, 2411-2502
Stopping-power enhancement from discrete particle-wake correlations in high-energy-density plasmas
Physical Review E  (IF2.529),  Pub Date : 2021-09-09, DOI: 10.1103/physreve.104.035203
I. N. Ellis, D. J. Strozzi, W. B. Mori, F. Li, F. R. Graziani

Three-dimensional (3D) simulations of electron beams propagating in high-energy-density plasmas using the quasistatic Particle-in-Cell (PIC) code QuickPIC demonstrate a significant increase in stopping power when beam electrons mutually interact via their wakes. Each beam electron excites a plasma wave wake of wavelength 2πc/ωpe, where c is the speed of light and ωpe is the background plasma frequency. We show that a discrete collection of electrons undergoes a beam-plasma-like instability caused by mutual particle-wake interactions that causes electrons to bunch in the beam, even for beam densities nb for which fluid theory breaks down. This bunching enhances the beam's stopping power, which we call “correlated stopping,” and the effect increases with the “correlation number” Nbnb(c/ωpe)3. For example, a beam of monoenergetic 9.7 MeV electrons with Nb=1/8, in a cold background plasma with ne=1026cm3 (450 g cm3 DT), has a stopping power of 2.28±0.04 times the single-electron value, which increases to 1220±5 for Nb=64. The beam also experiences transverse filamentation, which eventually limits the stopping enhancement.