Today, third- and fourth-generation synchrotron radiation (SR) sources and X-ray free-electron lasers (FEL’s) find many different applications in materials science, molecular biology and biochemistry, biomedical studies, crystallography, spectroscopy, studies of rapid processes and other areas of scientific and applied research. For these applications the crucial problem consists in reaching...
Scintillation light transport and collection at the entrance window of a photodetector in a great extent have effect on the energy and time resolutions of a scintillation detector, especially in the case of high value of the scintillator refraction index and its large size at least on one of dimensions. Now various wrappings are applying to improve light collection and in some cases, its...
The motivation for developing of intense THz source at KEK LUCX is coming from the growing interest to THz radiation from various scientific communities worldwide. High gradient photo-cathode RF gun and few tens of femtosecond (Ti:Sa) laser system are now routinely used to generate a pre-bunched electron beam of a few hundred femtoseconds. Also, a new Yb-dopped fiber based laser system with...
Nowadays, the possibilities of obtaining compact and safe particle sources and accelerators for a wide range of applications are being actively investigated and considered. One of such possibilities is a pyroelectric effect in single crystals of lithium niobate (LiNbO$_{3}$) and lithium tantalate (LiTaO$_{3}$) can lead to acceleration of electrons to energies of the order of 100 keV and to...
Radiation therapy is an important and effective technique of malignant tumors treatment [1]. Actual problem of radiotherapy is increasing effectiveness and reducing side effects of the treatment. Binary technologies of radiation therapy can be used to improve treatment results. One of the most promising technology is contrast-enhanced or “photon-capture” radiotherapy (PCT) [2]. The PCT is...
Nowadays radiation sources are widely used in different investigations and technological applications, such as radiation therapy, sterilization of medical equipment, welding, microstructuring processes etc. It is necessary to control beam parameters in exploitation of devices designed for this purposes. One of the main parameter is the particle flux density distribution in a transverse plane...
We investigate the radiation from a bunch of relativistic electrons moving along the cylindrical waveguide axis, assuming that a part of the waveguide is filled with a layered material, the dielectric permittivity and magnetic permeability of which are arbitrary periodic functions. Analytical expression is provided for the spectral distribution of the radiation energy flux through the cross...
It was experimentally shown that in the presence of temperature gradient in X-cut quartz crystal it was possible to obtain 2D bending of reflecting atomic planes (10-11) depending on the position and shape of heater, thereby ensure the possibility of 2D focusing of X-rays at reflection from these planes. It is noteworthy that the degree of bending depends on the thermal expansion coefficient...
The results of studies of the interaction of ion beams with deuterated crystal structures at the HELIS facility (LPI) are presented. In DD-reactions in deuterated crystal structures at deuteron energies 10-25 keV, significant enhancement effects are observed. For CVD-diamond and Pd targets, the orientation of the sample with respect to the deuteron beam was shown to affect the neutron yield.
Results of experiments on the electron acceleration and X-ray generation in during operation of the piezoelectric transformer in vacuum are described here. Piezoelectric transformer operates at the resonance frequency. Electrons are accelerated from the high voltage electrode of the piezoelectric ceramic transformer to the grounded target, which leads to generation of the characteristic and...
X-ray acoustic interactions allowing to implement the control of X-ray parameters are widely studied. Among the numerous researches, it is possible to highlight the ability of controlling the spatial and energy spectrum of X-ray radiation [1] and the effect of redistribution of intensity between transmitted and diffracted beam [2]. This paper describes the implementation of a combination of...