X-ray emission by multiple passes of electrons through periodic and crystalline targets mounted inside a synchrotron

Abstract

The number of passes of high-energy electrons through multiple foil and crystal radiators mounted inside of the Tomsk “Sirius” synchrotron, and the resulting increase in x-ray production efficiencies from these radiators, have been measured. The influence of electron transmission on the spectral and spatial distributions of parametric x radiation and on the spatial distribution of transition radiation has also been observed. We find that multiple passes increase the yields of these sources without destroying their angular distributions and spectra. Thus, multiple passes of electrons through these novel radiators may make them useful as x-ray sources for scientific and industrial purposes.

High efficiency compact source of monochromatic tunable X-ray radiation on base of electron accelerator with moderate particle energy

“…Moderate consumed power and compact sizes of similar devices (compare, for example, with [7]) open reliable prospects of their wide and various applications.…”

“…According to work [7], average maximal beam current is of order 0.5 A at beam radius of 1 mm. Therefore, taking into account displacement of particles along a target at their rotations, it is possible to admit that the planned for using accelerator can be under operation in limiting mode.…”

Generation of X-rays by electrons recycling through thin internal targets of cyclic accelerators

“…The experiments were performed for the energy of accelerated electrons E 0 = 300-900 MeV [2,3]. The internal targets (T) were placed in the goniometer head inside the equilibrium electron orbit at a distance of 65 mm from it.…”

Investigations and Properties of PXR

“…Here, we reproduce this formula in a form more convenient for the present paper (9) where e 2 L IXg(w)12 k K = 21fli£ge (Ve-1 -V . n) ; (10) dN is the number of quanta emitted in the solid angle dO as n particles having the charge e pass through the crystal thickness L; Xg(w) is the Fourier component of dielectric susceptibility; Ii is the Planck constant divided by 21f; EO is the average permittivity in the crystal; k = kn is the radiation wave vector; k = w"ff; W is the radiation frequency; n is the unit vector for the radiation direction; ko = ke + g; (11) e = ~ V is the particle velocity V in terms of the phase light-wave velocity in media }eo; e = lei; v = IVI; c is the light velocity; g is the reciprocal lattice vector of the set of crystallographic planes; k.L, g.L are the components of the vectors k, g perpendicular to V;…”