正柱等离子体在双极扩散及准双极扩散下的磁流体力学性能

THE MHD CHARACTERISTICS OF POSITIVE COLUMN PLASMA UNDER THE AMBIPOLAR AND QUASIAMBIPOLAR DIFFUSIONS

An analysis of positive column plasma in which the magnetic and electric fields are crossed is presented on the base of complete conservation of mass and momentum equations for the ions and electrons. In this case, both ambipolar and quasi-ambipolar diffusions are considered. The radial distributions of potential, velocities and number density of ions and electrons are obtained numerically. The results of the computations indicate that when the magnetic field strength gets higher under the quasi-ambipolar diffusion the average number density of ions is higher, the spacing between the anode and cathods sheaths shorter, the ion-so-electron current density higher at the electrod sheath, but lower at the anode sheath.