Shielding of a test charge: Role of plasma production and loss balance

Abstract

High-performance double-filter soft x-ray diagnostic for measurement of electron temperature structure and dynamics Rev. Sci. Instrum. 83, 10E129 (2012) Molybdenum emission from impurity-induced m = 1 snake-modes on the Alcator C-Mod tokamak Rev. Sci. Instrum. 83, 10E517 (2012) Extreme ultraviolet spectroscopy and modeling of Cu on the SSPX Spheromak and laser plasma "Sparky" Rev. Sci. Instrum. 83, 10E101 (2012) Note: Measurement of the runaway electrons in the J-TEXT tokamak Rev. Sci. Instrum. 83, 056108 (2012) Effect of poloidal asymmetries on impurity peaking in tokamaks Shielding of a test charge in a highly collisional plasma is studied taking into account plasma production and loss processes. It is shown that the electric potential distribution is in general different from the conventional Debye-Hückel ͑exponentially screened Coulomb͒ form. The obtained results can be of great importance for a variety of phenomena including basic interactions, transport, phase transitions, and self-organization in conventional electron-ion and complex ͑dusty͒ plasmas.

Glass-transition properties of Yukawa potentials: From charged point particles to hard spheres

“…In complex plasmas, the average interparticle distance compared to the particles' diameters is typically large enough to allow for an approximation of point-like particles and hence a screened Coulomb potential for point particles is appropriate. In addition to the screening length, in complex plasmas also a second repulsive length scale arises from the non-equilibrium ionization-recombination balance [7,8] which gives rise to a double Yukawa potential at interparticle distances r as U (r) k B T = Γ r [exp(−κr) + ǫ exp(−ακr)] .…”

Electron and ion thermal forces in complex (dusty) plasmas

“…Although it is well recognized that the long range asymptote of the electrical potential can be modified (by e.g. continuous plasma absorption on the grain surface [21][22][23][24] or plasma ionization/recombination effects [25]), this is expected to affect merely grain-grain interactions, but not the momentum transfer from the ions and electrons.…”

Glass transition of charged particles in two-dimensional confinement

“…Unlike the two-dimensionally confined, mesoscopic charged particles, ions are free to move in 3D space in the absence of external forces. Under these conditions the effective interaction potential energy U Y (x) between charged particles at sufficiently large mutual distance follows the screened Coulomb (Yukawa)-type form [18] …”