arXiv subjects

Sergey Masalovich

Publications and source records attributed to Sergey Masalovich.

3 recordsLinked to original sources

arXiv2020

Billiards in a gravitational field: A particle bouncing on a parabolic and right angle mirror

We propose geometric tools that are suitable for studying the behavior of a billiard trajectory in a homogeneous force field. Two examples are considered: a vertical plane with an open top and with a parabolic or right angle boundary at the bottom. In either case, we obtain equations that describe the envelope of a trajectory. These equations are in good agreement with those found earlier with the use of other calculation methods. In addition, we present some new geometric properties of trajectories. We show that in the case of a parabolic boundary the sequence of the trajectory impact points can be easily constructed by multiple reflections of a single ellipse.

physics.optics↗

arXiv2019

Analysis of the detective quantum efficiency of a neutron image plate detector

The aim of the present note is to derive a general formula for a detective quantum efficiency (DQE) of a neutron image plate detector which includes all essential parameters of the system. Relying on that formula, the effects of a variety of processes involved in the formation of an output signal are discussed and estimated. The theoretical value of the DQE is compared with the experimental one measured for the commercial neutron image plate BAS-IP ND 2025 (FUJIFILM).

physics.ins-det↗

arXiv2017

Application of a Portable $^3$He-Based Polarization Insert at a Time-of-Flight Neutron Reflectometer

The suitability of a transportable 3He-spin filter as temporary broadband polarizer for a Time-of-Flight neutron reflectometer is demonstrated. A simple two-wavelength method for characterisation of a 3He-spin filter is proposed, which can be applied even if the absolute transmittance of the 3He-spin filter cannot be accurately determined. We demonstrate the data treatment procedure for extracting the spin-up and spin-down neutron reflectivity from measurements obtained with a time dependent 3He polarization. The extraction of a very weak magnetic signal from reflectivity data, measured on the in-situ grown magnetic heterostructure Fe1 nm/Cu20 nm/Sisubstrate in an externally applied magnetic field of 30mT is presented and compared to similar measurements on the growth stage Cu20 nm/Sisubstrate of the very same sample, which does not yet contain any magnetic material.

physics.ins-det↗