The shape of TESLA accelerating structure can be improved to decrease maximal surface magnetic field by sacrificing and increasing maximal surface electric field. This sacrifice may be necessary because the magnetic field is a hard limit but electric field emission can be decreased by processing. For the case of superconducting cavities RF magnetic strength should be of a more concern.

Dark matter, the major component of the matter content of the Universe, played a significant role at early stages during structure formation. But at present the Universe is dark energy dominated as well as accelerating. Here, the presence of dark matter has been established by including a time-dependent Λ term in the field equations. This model is compatible with the idea of an accelerating Uni...

Dielectric laser-driven accelerators (DLAs) based on gratings confine an electromagnetic field induced by a drive laser into a narrow vacuum channel where electrons travel and are accelerated. This can provide an alternative acceleration scheme compared to conventional RF cavity accelerators. Due to the achievable high accelerating gradient of up to several GV/m this could pave the way for futu...

We examine the dynamics of electron beams that, in free space, are self-accelerating, presence an additional magnetic field. focus our attention case Airy that follow parabolic trajectories and generalized classes associated with power-law trajectories. study interplay between beam self-acceleration circular motion caused by In beams, using integral representation, we find closed-form solutions...

The measurements of the electron cloud footprints produced by a stack of microchannel plates ~MCPs! as a function of gain, MCP-to-readout distance and accelerating electric field are presented. To investigate the charge footprint variation, we introduce a ballistic model of the charge cloud propagation based on the energy and angular distribution at the MCP output. We also simulate the Coulomb ...