Electrostatic behavior of a collisionless plasma in the foot region of high Mach number perpendicular shocks is investigated through the two-dimensional linear analysis and electrostatic particle-in-cell (PIC) simulation. The simulations are double periodic and taken as a proxy for the situation in the foot. The linear analysis for relatively cold unmagnetized plasmas with a reflected proton be...

040702-1 A self-amplified spontaneous emission free-electron laser (SASE FEL) is a device which is based on the creation of a very intense, relativistic electron beam which has very little temperature in all three phase planes. The beam in this system is described as having ‘‘high brightness,’’ and when it is bent repetitively in a magnetic undulator, undergoes a radiation-mediated microbunchin...

For not very short bunches, the coherent synchrotron radiation (CSR) is usually suppressed by the shielding effect of the conducting walls of the vacuum chamber. However an initial density fluctuation in the beam with a characteristic length much shorter than the bunch length can radiate coherently. If the radiationreaction force drives growth of the initial fluctuation, one can expect an insta...

Abstract We study the effect of a tangled sub-fG level intergalactic magnetic field (IGMF) on electrostatic instability blazar-induced pair beam. Sufficiently strong IGMF may significantly deflect TeV beams, which would reduce flux secondary cascade emission below observational limits. A similar reduction result from beam–plasma instability, operates best in absence IGMF. Considering with corre...

The EicC (The highly polarized Electron-ion collider in China) project proposes a scheme with different numbers of bunches the two rings, which leads to an asymmetric beam-beam effect, also known as gear-change effect. In order investigate feasibility collision EicC, self-consistent simulation program named athenagpu, uses GPU for high-performance computing, was developed. A linearized matrix m...

A series of new ground-based experiments on the heartbeat instability in complex (dusty) plasmas was conducted. The experiments included the investigation of a stability diagram of a dust cloud in a RF discharge, time-resolved measurement of the plasma emission during the heartbeat instability, control of the instability by means of a modulated laser beam, whose wavelength was tuned to an atomi...

The dynamic instability of single-walled carbon nanotubes (SWCNT), double-walled carbon nanotubes (DWCNT) and triple-walled carbon nanotubes (TWCNT) embedded in an elastic medium under combined static and periodic axial loads are investigated using Floquet–Lyapunov theory. An elastic multiple-beam model is utilized where the nested slender nanotubes are coupled with each other through the van d...

For the system formed by a relativistic electron beam and its plasma return current, we investigate the effects of both transverse and parallel beam and plasma temperatures on the linear stability of collective electromagnetic modes. We focus on nonrelativistic temperatures and wave-vector orientations ranging from two-stream to filamentation instabilities. Water-bag distributions are used to m...

Simplified beam line for low energy Ion implantation is considered. Compensation of the space charge of high perveance, low energy ion beam in beam lines for ion implantation and isotope separation has been investigated. Different mechanisms of the compensating particle formation such as ionization by the beam, secondary emission of electrons and negative ions, electronegative gas admixture, an...