UNIVERSITY OF BUCHAREST
FACULTY OF PHYSICS

Guest
2024-11-24 21:09
 HOME     CONFERENCES     SEARCH            LOGIN     NEW USER     IMAGES   


Conference: Bucharest University Faculty of Physics 2007 Meeting


Section: Educational Physics


Title:
The plasma physics-a modern discipline which made her appearance especially because of multiple applications


Authors:
Liliana-Violeta Constantin, Sorin Trocaru


Affiliation:
”Elena Cuza” National College

MEC


E-mail
liliana2009constantin@yahoo.com


Keywords:
plasma physics, applications


Abstract:
Plasma entered in force not only in the old applications like public and industrial illumination, but also in a series of new scientific research and practical branches of mankind activity. Until now there were realised instalations of plasmatron type for cutting and depositions, lasers with plasma, devices for direct transformation of the thermoelectric energy in electric energy, the thermoionic convertisors with plasma or the magnetohydrodynamic ones. There are known the sources of ions, of electrons or of fast neutral particles which use plasma. A remarkable perspective is offered by the development of the thermonuclear plasmas aiming to realise durable sources of energy, more profitable than all the known sources of energy. All these actual and perspective applications of plasma imply a good knowledge of the Plasma Physics. For these reasons, the present work presents the cathodic region of the luminescence discharge, where a plasma is creted. After the presentation of the volt-amper characteristic there are described the parts of the luminescence discharge. There are emphasized the importance of the cathodic parts of the luminescence discharge and the factors which influence the normal and abnormal potential fall. It is also presented the appearing mechanism of a discharge without dark cathodic space. It was experimentaly verified the fact that, in the system of the normal luminescence discharge, the cathodic fall and the current density are constant. It is presented the characteristics family, j=f(p), named Güntherschulze, obtained in a luminescence discharge in air, at low pressures for different tensions of burning. It is verified that the ratio between the current density and the square of the pressure does not depend on the pressure, for a given cathodic fall.