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Vol 43, No 5 (2016)
- Year: 2016
- Articles: 6
- URL: https://journals.rcsi.science/1068-3356/issue/view/14059
Article
Effect of an oriented crystalline converter on the electromagnetic spectrometer response
Abstract
The results of the experimental studies of the response of an electromagnetic spectrometer with a converter made of 〈111〉 tungsten crystal at electron energies of 26, 28, and 31 GeV are presented. It is found that the ratio of the difference between positions of the cascade curve maximum for misoriented and oriented converter to the difference between energy releases at the cascade curve maximumis a constant value at a given electron energy, converter type and thickness, and is independent of the converter temperature.
153-155
Laser vaporisation of absorbing liquid under transparent cover
Abstract
Vaporization of absorbing liquid (water) under a transparent solid cover upon exposure to nanosecond pulses of a holmium laser (λ = 2920 nm) is studied using acoustic and optical diagnostics. The features of the optical signal reflected from the liquid–cover interface suggest that a vapor cavity appears at a submicrometer distance from this interface and exists for about one hundred microseconds. An additional acoustic signal appearing after returning the light signal to the initial level is caused by known cavitation effects accompanying vapor cavity fracture and collapse in liquid.
156-159
On the possibility of developing the non-contact delivery system for cryogenic thermonuclear target transport to the IFE reactor
Abstract
It is proposed to use the HTSC quantum levitation phenomenon in magnetic fields of various configurations to develop the systems of contact-free positioning and transport of cryogenic fuel targets (CFTs) to the focus of a high-power laser installation or the IFE reactor. The results are presented of a large cycle of experimental studies using YBa2Cu3O7−x superconducting ceramics and permanent magnet guideways based on various combinations of permanentmagnets to develop “CFT-MAGLEV” delivery systems.
160-166
Raman light scattering in sodium nitrite crystals
Abstract
Raman light scattering spectra of a ferroelectric sodium nitrite crystal is studied in the lattice mode region as the temperature is lowered from room temperature to 123 K. The existence of a Raman satellite corresponding to the soft lattice mode, i.e., transverse polar vibration responsible for the ferroelectric phase transition, is established for the first time. It is found that the intensity of the Raman scattering by the pseudo-scalar low-frequency A2 mode exceeds the intensity of other lattice variations by an order of magnitude.
167-173
Nanoscale metal oxide particles produced in the plasma discharge in the liquid phase upon exposure to ultrasonic cavitation. 3. Optical nonlinearities of particle suspensions
Abstract
The nonlinear response of metal oxide nanoparticles obtained by the acoustic plasma method is measured in aqueous disperse systems at a wavelength of 532 nm. Induced absorption is detected in the Cu2O, WO3, and ZnO disperse systems, and bleaching is detected in the Fe2O3 system. The real and imaginary parts of nonlinear third-order susceptibilities are determined.
174-178
Orientational optical torque in a nematic liquid crystal, caused by trans- and cis-isomers of low- and high-molecular compounds
Abstract
The effect of light on the conformational composition of low- and high-molecular (fifth-generation dendrimer) azobenzene dyes in a nematic host is studied. The orientational optical response of the nematic liquid crystal (NLC), caused by the presence of these compounds in the nematic host, is measured. The contributions of isomers to the orientational optical torque affecting the NLC director are determined. The results obtained suggest that the increase in the optical orientation efficiency in NLCs when using high-molecular dopants instead of low-molecular ones is unrelated to the difference in their conformational composition in the light field, but is caused by deceleration of orientational motion of chromophores.
179-183