Schematic diagram of the initial conditions set up for simulations with collision types differing in ion trajectories. (IMAGE)
Caption
Left: Initial temperature and density setup, which mirrors conditions of the stable and isobaric burning process. Middle: the ion scattering trajectories for large or small angles, and the boundaries of cross-sections at various impact parameters. Right: ions in large-angle collisions exchange substantial energies during a single collision, leading to supra-thermal ions defying Maxwellian distribution, while ions in small-angle collisions continuously lose energies during multiple collisions, resulting in an equilibrium or Maxwellian ion distribution. In their simulations, integrating the screened potentials of the background with the relative motion of ions during binary collisions leads to the cutoff, which encloses an area that constitutes the cross section for large-angle collisions, while the remainder pertains to small-angle collisions.
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