Journal
PHYSICS OF PLASMAS
Volume 28, Issue 4, Pages -Publisher
AIP Publishing
DOI: 10.1063/5.0045078
Keywords
-
Categories
Funding
- Air Force Office of Scientific Research [FA9550-16-1-0221]
- National Science Foundation [PHY-1453736]
- NSF [ACI-1548562, PHYS-150018]
Ask authors/readers for more resources
Molecular dynamics simulations show that strong magnetization increases space and time scales of interparticle correlations, mainly due to a channeling effect where particles are confined to move along narrow cylinders. The influence is demonstrated by the dependence of velocity autocorrelation functions and self-diffusion coefficients on domain size and run time in simulations of one-component plasma.
Molecular dynamics simulations are used to show that strong magnetization significantly increases the space and time scales associated with interparticle correlations. The physical mechanism responsible is a channeling effect whereby particles are confined to move along narrow cylinders with a width characterized by the gyroradius and a length characterized by the collision mean free path. The predominant interactions are the 180 degrees collisions at the ends of the collision cylinders, resulting in a long-range correlation parallel to the magnetic field. Its influence is demonstrated via the dependence of the velocity autocorrelation functions and self-diffusion coefficients on the domain size and run time in simulations of the one-component plasma. A very large number of particles, and therefore domain size, must be used to resolve the long-range correlations, suggesting that the number of charged particles in the collection must increase in order to constitute a plasma. Correspondingly, this effect significantly delays the time it takes to reach a diffusive regime, in which the mean square displacement of particles increases linearly in time. This result presents challenges for connecting measurements in non-neutral and ultracold neutral plasma experiments, as well as molecular dynamics simulations, with fluid transport properties due to their finite size.
Authors
I am an author on this paper
Click your name to claim this paper and add it to your profile.
Reviews
Recommended
No Data Available