Influence of relaxation on propagation, storage and retrieving of light pulses in electromagnetically induced transparency medium

By solving the self-consistent system of Maxwell and density matrix equations to the first order with respect to nonadiabaticity, we obtain an analytical solution for the probe pulse propagation. The conditions for efficient storage of light are analyzed. The necessary conditions for optical propagation distance has been obtained.Comment: 7 pages, 7 figure

Wiggler Magnet Optimization for Linear Collider Damping Ring

Optimization results of a permanent magnet wiggler by 3D field calculation are shown. The developed model of optimization provides significant decreasing of field nonlinearity in a wiggler gap. Proposed wiggler optimization is executed on the example of a TESLA damping ring (DR) and can be used at designing of ILC DR

The runaway nature and origin of {\alpha} Crucis system

Massive stars are always the focus of astronomical research and a significant part of them (10--20%) moves in space at a high (supersonic) velocity. This paper presents the results of a study of the $\alpha$ Crucis system, located at $\sim$114 pc distance from the Sun, with an observed bow shock around it. We used data and images from the Gaia and WISE space telescopes. The coordinates, distance, and proper motion of the $\alpha$ Crucis system were used to determine its space velocity. We managed to find a stellar cluster to which the $\alpha$ Crucis system belongs, that is, it has not been ejected from its parent cluster, but is moving in space together with other members of the cluster. The $\alpha$ Crucis system has a velocity of $\sim$1.3 km/s relative to the star cluster. The geometric parameters of the bow shock are compatible with other known bow shocks. The bow shock is unaligned, i.e., most likely interstellar medium large-scale motions are responsible for the resulting bow shock, which is further evidence that the $\alpha$ Crucis system is not runaway in nature.Comment: 6 pages and 4 figure