arXiv subjects

P. I. Melnikov

Publications and source records attributed to P. I. Melnikov.

3 recordsLinked to original sources

arXiv1998

Ha spectroscopy for hot plasma parameters measurement

The new spectroscopic method for measurement of hot plasma parameters is developed. The method based on Ha profile monitoring. The profile was accurately calculated for a wide range of plasma parameters (n$_e \sim $ 10$^{14} ÷$ 10$^{17}$ cm$^{-3}$, T$_e \sim 1÷$500 eV) Use of the method in the experiment gives the electron density and ion temperature dependence from the time. Measurements was in a good agreement with diamagnetic loop dates. Key words: H$_α$ spectroscopy, line profile, density and high temperature measurement.

physics.plasm-ph↗

arXiv1998

Active Stark Atomic Spectroscopy

Active Stark Atomic Spectroscopy (ASAS) method can be used to determine a high electric field in the diode of an ion or electron accelerator as a function of position and time, including the positions of anode and cathode plasma emission surfaces (in order to obtain the effective accelerating gap). As possible probe beams, we suggest the use of lithium and sodium atoms. The diagnostic provides a means to measure diode quantities spectroscopically with excellent spatial resolution.

physics.atom-ph↗

arXiv1998

Concentrator of laser energy for thin vapour cloud production near a surface

A novel scheme is presented for production of a thin ($<1$ mm) uniform vapor layer over a large surface area ($>100$ cm$^2$) by pulsed laser ablation of a solid surface. Instead of dispersing the laser energy uniformly over the surface, a modified Fabry-Perot interferometer is employed to concentrate the laser energy in very narrow closely-spaced concentric rings. This approach may be optimized to minimum total laser energy for the desired vapor density. Furthermore, since the vapor is produced from a small fraction of the total surface area, the local ablation depth is large, which minimized the fraction of surface contamination in the vapor. Key words: laser evaporation, thin gas layer formation.

physics.acc-ph↗