We have studied the linear dispersion relation for Langmuir waves in plasmas of very high density, based on Dirac–Heisenberg–Wigner formalism. The vacuum contribution to physical observables leads ultraviolet divergences, which are removed by a charge renormalization. remaining is small and agreement with previously derived expressions time-dependent polarization. main new feature theory dampin...

A classical model of radiation reaction for the betatron oscillation an electron in a plasma wakefield accelerator is presented. The maximum energy due to longitudinal found, and damping both transverse effects analyzed. Both theoretical numerical solutions are shown with good agreements. regime that quantum takes effect also discussed. This important designing future based super accelerators o...

in this article the relationship between the amount of seasonal rainfall (autumn, winter and spring) and climate indices in iran have been studied. the climate indices (the southern oscillation(soi),the north atlantic oscillation(nao), arctic oscillation(ao),nino 3/4,the multivariate enso index(mei),trans_ nino index(tni) and the pacific decadal oscillation(pdo) are used as independent variable...

A process analogous to electromagnetically induced transparency in atoms is described for an ideal plasma. Two electromagnetic fields whose frequency difference is near, but not equal, to the plasma frequency will drive a longitudinal plasma oscillation whose contribution to the current density opposes the current density produced by either field, if alone. This creates a passband at frequencie...

Cold plasma theory is used to calculate the response of an ultracold neutral plasma to an applied rf field. The free oscillation of the system has a continuous spectrum and an associated damped quasimode. This quasimode dominates the driven response and is resonant in the tail of the density distribution. Recent experiments used the plasma response to an applied rf field to determine the plasma...