arXiv subjects

A. Amatuni

Publications and source records attributed to A. Amatuni.

4 recordsLinked to original sources

arXiv1997

Generator-Invertor-Dumper System of Electron (Positron) Bunches Moving in Cold plasma for Development of Strong Accelerating Electric Field

It is shown that high accelerating gradient can be obtained in a specially constructed system of electron (positron) bunches, moving in cold plasma,with definite density. These combined bunch systems do not generate the wake fields behind them and can pass through the plasma column in a periodic sequence. The consideration is carried out numericaly and analyticaly in one dimensional approach, (which can be applied to finite system when its transverse dimensions are larger than plasma wave length, divided by $2π$). The possibilities of the experimental tests by measuring the predicted energy gain are discussed on the examples of Argonne Wakefield Accelerator and induction linac with typical parameters.

physics.acc-ph↗

arXiv1996

Nonlinear Two-dimensional potential plasma wake waves

The condition for potential description of the wake waves,generated by flat or cylindrical driving electron bunch in cold plasma is derived. The two-dimensional nonlinear equation for potential valid for small values of that is obtained and solved by the separation of variables. Solutions in the form of cnoidal waves,existing behind the moving bunch at small values of vertical coordinate,are obtained.In particular,at some boundary conditions,corresponding to blow-out regime in the underdense plasma,the solution represents by a solitary nonlinear wave. Approximate solution is also obtained using the method of multiple sacales. The indications are obtained that the dependense of the amplitudes on longitudinal coordinate determines essentially,even in the first approximation,by driving bunch charge distribution.The wake wave amplitude can increase at some conditions along the longitudinal distance from the rear part of the bunch.

physics.plasm-ph↗

arXiv1996

Selfacceleration of Electrons in One-dimensional Bunches, Moving in Cold Plasma

Nonlinear dynamics of the one-dimensional ultrarelativistic bunch of electrons,moving in cold plasma,is considered in multiple scales perturbative approach. A square root of the inverse Lorentz factor of the bunch electrons is taken as a small parameter. Bunch electrons momenta is changed in the first approximation.In the underdense plasma and for the model example of the combined bunch the selfacceleration of the bunch electrons can be remarkable.

acc-phys↗

arXiv1996

Approximate Analytical Description of the Underdense Short Plasma Lens

The perturbative approach for describing the underdense plasma--ultrarelativistic electron bunch system is developed, using the ratio $\frac{n_0}{n_b}$ as a small parameter ($n_b$--bunch,$n_0$--plasma electron densities). Focusing of the electron bunch emerged in the first approximation of the perturbative procedure as a result of the plasma electrons redistribution. Focusing gradient and strength for ultrarelativistic, flat, uniform and short bunch are obtained and compared with the previous results.

acc-phys↗