N. Ya. Shaparev

Laser Cooling of Recombining Electron-Ion Plasma

A method of producing and confining ultracold electron-ion plasma with a strongly nonideal ion subsystem is considered. The method is based on the laser cooling of plasma ions by the radiation resonant with the ion quantum transition. A model is developed for the laser cooling of recombining plasma. Computer simulation based on this model showed that the ion nonideality parameter can be as large as ∼100. The data obtained demonstrate that the production of ultracold nonideal plasma is quite possible.

Laser control of the state of a plasma in a selective optical trap

Laser cooling of resonant ions is shown to be applicable to the effective control of the temperature of charged particles in a low-temperature electron-ion plasma confined in a magnetic trap.

Optical confinement of low-temperature plasma with resonant ions

Applications of the rectification of a gradient force in interfering bichromatic fields produced by intersecting laser beams for selective optical confinement of low-temperature electron-ion plasma with resonant ions are examined.

New Possibilities of Using the Voigt Profile

New possibilities of using the Voigt profile are suggested for investigation of characteristics of radiation absorption in a gas. For this purpose, the absorption coefficient in the line center and the total absorption linewidth are determined without knowledge of a dependence of the shape of the Voigt profile on the frequency. Asymptotic values of these characteristics are determined. Based on this approach, the temperature of ions in ultracold plasma is determined and compared with the available experimental data.

Characteristics of radiation absorption in an expanding gaseous sphere

Absorption of external radiation in self-similar expanding gaseous sphere is considered. The dependence of the optical thickness of the medium, contour shape, and width of the spectral line of absorption on the initial optical thickness and ratio of the boundary gas spread velocity to the thermal velocity of atoms is determined.