Conveners
Radiation: Generation & Interaction: S2.1
- Vardazar Kotanjyan
Radiation: Generation & Interaction: S2.2
- Andrea Ghigo (Istituto Nazionale di Fisica Nucleare)
Radiation: Generation & Interaction
- Gianluca Cavoto (Istituto Nazionale di Fisica Nucleare)
Recent years have witnessed an intense investigations of Cherenkov diffraction radiation (ChDR) appearing when a fast charged particle moves in the vicinity of and parallel to a dielectric interface. This is a member of polarization radiation family, because the radiation arises as a result of dynamic polarization of a medium. The ChDR properties are sensitive to various beam parameters...
The following paper will display the fundamental ChDR studies which have been undertaken using the BPM prototype, presenting the design of the BPM itself whilst focusing on the process of optimising the maximum signal for 500 nm narrowband ChDR. Data acquisition for the examination of ChDR signal decay has stemmed from impact parameter scans where a particular assembly or beam parameter is...
Inverse Compton scattering [1, 2] is a promising instrument for engineering of a bright, compact and versatile X-ray source: with dimensions being significantly smaller, the brightness of this source is comparable with that of synchrotron radiation. Here we report on the creation of a new C++ module for inverse Compton scattering simulation and its implementation into Geant4 [3]. The module...
The AQUA beamline of the EuPRAXIA@SPARC_LAB free-electron laser facility
is a SASE FEL designed to operate in the water window, in the 3-4 nm wavelength range. The electron beam driving this source is accelerated up to 1-1.2 GeV by an X-band normal conducting linear accelerator followed by a plasma wakefield acceleration stage.
The main radiator consists of an array of ten APPLE-X permanent...
The results of theoretical investigation of the spectral and angular distributions of the radiation generated by a charged particle crossing a ball of dispersive material in vacuum, are presented. Previously, in the case of a non-dispersive dielectric ball it was shown that strong peaks appear in the spectral distribution of the radiation intensity for certain values of the problem parameters....
The results of theoretical investigations of the spectral distributions of the radiation generated by an electron rotating around a ball of a dispersive matter, in vacuum, are presented. Previously, for non dispersive dielectric ball was shown that for certain values of the problem parameters, at certain harmonics, the electron may generate radiation field quanta exceeding in several dozens...
We investigate the features of surface polaritons generated by a charged particle coaxially circulating inside a cylindrical waveguide immersed in a homogeneous medium. The corresponding surface waves are emitted on the eigenmodes of the cylindrical waveguide in the spectral range where the real parts of the dielectric permittivities for the cylinder and surrounding medium have opposite signs....
The report presents the measurement results of the characteristics of optical Cherenkov radiation (ChR) in comparison with traditional transition radiation (TR). The experiment was carried out using an electron beam from the LINAC200 accelerator with an energy of 18 MeV. The radiation was detected at an angle of 90 degrees relative to the electron beam using the TAMRON lens with a focal length...
The results of experimental observations of X-ray transition radiation (with energies ranging from 10 to 200 keV) from a stack of thin aluminum foils (10-20 µm thick), separated by layers of either Teflon or air (50-100 µm thick), are presented. The experiment was conducted using the electron beam of the DESY Test Beam Facility at energies of 1.0 and 2.4 GeV. The spectral-angular distribution...
Thomson backscattering of a laser beam on relativistic electrons is one of the most promising ways to generate bright quasi-monochromatic X-ray radiation. To achieve a high luminosity of such a source, it is possible to increase the intensity of the initial beams, but this will lead to nonlinear effects, which significantly degrade the radiation spectrum. Another approach is to optimize the...
high-energy physics and astrophysics, yet their crystalline structure and lattice orientation are often overlooked in detector design. However, the electromagnetic field experienced by particles impinging on a crystal at small angles relative to a lattice axis can significantly influence interaction mechanisms. Specifically, for electrons or photons with energies of O(10 GeV) or higher...
In this work, the interaction potentials of electrons with the main crystallographic planes (100), (110), (101), (001) and (111) in crystals of tetrafluoroaluminates KAlF4, TlAlF4, RbAlF4 and NH4AlF4 were calculated. For beams of weakly relativistic electrons with Lorentz factors $\gamma$ = 10, 20, 30 and with different angular dispersions, the features of spontaneous short-wave radiation...
The results of an experimental study of the spectral angular distribution of coherent transition and Cherenkov radiation in the sub–terahertz frequency range are presented. As targets, a thin silicon plate with an aluminium coating and a cylindrical Teflon resonator were used. The AREAL linear accelerator, with an energy of 3.6 MeV and located at the CANDLE Synchrotron Research Institute in...
