Conveners
e–/e+ beams interaction in solids
- Pavel Karataev (Royal Holloway, University of London)
e–/e+ beams interaction in solids
- Alexander Shchagin (DESY)
e–/e+ beams interaction in solids
- Aram Saharian
e–/e+ beams interaction in solids
- Weihao Liu (NUAA: Nanjing University of Aeronautics and Astronautics)
The radiation of surface polaritons by charged particles moving inside or outside a cylindrical dielectric waveguide is discussed. It is assumed that the waveguide is immersed in a homogeneous medium. As an active medium, supporting the propagation of surface polaritons, both the cases of interior and exterior media are considered. The radiation fields are explicitly separated in both those...
In this report, we propose an on-chip beam position monitor based on the spectral analysis of the Smith-Purcell (SPR) radiation that occurs when the beam passes near periodic chains of subwavelength particles [1]. Since the SPR is quasi-monochromatic and its spectral distribution harmonically depends on the chain period, it is easy to distinguish between radiation coming simultaneously from...
The spectral-angular distribution of the coherent radiation by a train of electron bunches crossing a conducting ball is teoreticaly studied. The work is based on the corresponding exact analytic solutions of Maxwell’s equations. The generalized Drude–Lorentz–Sommerfeld formula for the dielectric function of material of the ball is used in numerical calculations. It is shown that peaks in the...
Smith-Purcell radiation (SPR) is a widely known effect considered as prospective for ultra-relativistic electron beam diagnostics. Yet, the applications of this effect are not limited to physics of high-energy accelerators: nowadays, it is investigated as the way for generation of radiation from plasmonic and meta-structures.
In this report i consider theoretically SPR from the periodical...
Optical beam diagnostics is widely used to measure both transverse and longitudinal bunch sizes. In latter case a streak camera can provide time resolution of about 1 ps if the light intensity would be high enough. In photon counting devices a silica aerogel with refraction index of $n(\lambda)=1.05$ is used as a Cherenkov radiator. A complicated optical scheme should be used to transport and...
We investigate the quasi-coherent radiation from a train of electron bunches moving along the axis of a cylindrical waveguide, assuming that a part of the waveguide is filled with a material. For the dielectric permittivity of the latter the general case of dispersion is considered. It is shown that under certain conditions on the dielectric function of the medium and the values of the problem...
We investigate the radiation from a charge moving inside a dielectric cylinder parallel to its axis. It is assumed that the cylinder is immersed in a homogeneous medium. Depending on dielectric permittivities of the cylinder and surrounding medium different types of radiations are emitted. They include the Cherenkov radiation propagating outside the cylinder, the Cherenkov radiation confined...
This report is devoted to the radiation arising from the motion of an ultra-relativistic particle in a fractal non-magnetic medium. The concept of a fractal medium is widely used in condensed matter physics [1]. Fractal materials are substances whose fractal dimension is different from the topological one: a topological dimension can be only 0, 1, 2, 3, while a fractal dimension can be a...
In modern particle physics, a variety of different detectors [1] is used for the particle identification, tracking [2, 3] and detecting their energy or other characteristics [4-6]. Each detector type can be characterized by the detection efficiency, temporal resolution, linearity of response, and energy and spatial resolutions. For example, for the time-of-flight positron emission tomography...
In the contribution we will describe generation mechanism of SPXR and will provide results of the theoretical research for characteristics of this new type of the coherent x-ray radiation.
In fact, we are considering the case of SPXR as result of interaction of mini-bunched electron beam modulated in density inside the undulator of a XFEL [1] and crystalline target, where the parametric...
The good agreement between the results of calculation of the yield and angular distributions of parametric X-ray radiation (PXR) of electrons in crystals in the framework of the kinematic theory with experimental data [1, 2] makes it possible to use the results of PXR measurements to determine the parameters of experimental equipment, see, for example, [3].
The most interesting is the...
In this report, we show experimental and theoretical investigation of coherent transition radiation from finite-size screen in the prewave zone. Experimental measurements were performed for sub-THz range at LINAC-200 facility (JINR). We compare the experimentally obtained results with numerical simulation and evaluate the longitudinal beam size.
Hollow beams of charged particles are the beams having a transverse profile in the form of a ring. In recent years, they are actively studied. For example, the idea of using hollow electron beams for high-intensity beam collimation at the Large Hadron Collider at CERN was suggested in [1, 2]. Acceleration of charged particles is another promising area of using the hollow electron beams. It is...
Nowadays, the development of an approach for quick and accurate diagnostics of ionizing radiation beams is important. This study proposes a method of multi-angle scanning using scintillation optical fibers as detection elements for determining the energy electron beam profile. Beam characterization measurements by this method involve several steps, including mathematical processing based on...
Pyroelectric effect in the single crystals of lithium niobate (LiNbO3) and lithium tantalate (LiTaO3) gives unique possibility to generate and accelerate electrons to energies of the order of 100 keV. This phenomenon underlies conception of a pyroelectric accelerator. This device can be used as a portative X-ray tube, weak-intensity monoenergetic neutron source, a deflector of external...
