摘要:

AbstractThe present paper is devoted to the investigation of the kinetics of the electron component in the stationary beam discharge plasma in molecular nitrogen. Using the Boltzmann equation with the inclusion of the elastic and the main inelastic binary collisions and also the Coulomb interaction between the charged particles we have calculated the energy distribution function and some macroscopic quantities of the electrons within a large range of parameters. Using our earlier results for the beam discharge plasma in hydrogen, also the dependence of the macroscopic quantities on the kind of molecular gas is discussed. Finally, the comparison of some macroscopic properties of the beam and the glow discharge plasma was performed under the condition of equal power input per volume unit in both types of plasmas in nitrogen.

ISSN:0005-8025    

DOI:10.1002/ctpp.19800200102

出版商:WILEY‐VCH Verlag    

年代:1980

数据来源: WILEY

摘要:

AbstractNach der Darlegung der für die diffusionstheoretische Beschreibung des Säulenplasmas der Wasserstoffentladung wesentlichen Reaktionsmechanismen der Ionisation, der Dissoziation, der dissoziativen Rekombination, der Ionen‐Molekülumwandlungen und der Neutralteilchenumwandlungen wird ein System von Bilanzgleichungen für die H4+‐, H2+‐, H3+‐ und H5+‐Ionen, die Wasserstoffatome, das Neutralgasgemisch, die Ladungsneutralität und den Entladungsstrom hergeleitet und die Lösungsmethode dieses Systems erläutert. In den nachfolgenden Teilen werden konkrete Ergebnisse der numerischen Berechnung teilweise im Vergleich zu experimentellen Result

ISSN:0005-8025    

DOI:10.1002/ctpp.19800200103

出版商:WILEY‐VCH Verlag    

年代:1980

数据来源: WILEY

摘要:

AbstractStarting from the Boltzmann equation the moment equations up to the third order for a non‐quasineutral plasma are derived. It is shown that for a non‐quasineutral plasma, in the distinction from the second order set of moment equations, the systems of the first order and of the third order can be closed in a physically reasonable manner by a relatively simple method when near the walls the ion gas has a high drift velocity caused by an electric field. From this follows that in non‐quasineutral plasmas the ion pressure must be neglected in the first order set of equations consisting of the equations of continuity and of momentum transfer. Terms of the first order in the ion pressure related to the electron pressure are taken into consideration for the third order system. In this way one obtains a unified set of differential equations to treat both the quasineutral plasma core and the space charge sheath at the walls jointly taking into account a non‐vanishing ion temperature. This set of equations is applied to the positive column in the free‐fa

ISSN:0005-8025    

DOI:10.1002/ctpp.19800200104

出版商:WILEY‐VCH Verlag    

年代:1980

数据来源: WILEY

摘要:

AbstractThe erosion of arc cathodes is caused by evaporation and by forced fluid motion of the molten metal layer at the spot surface. The gross erosion rates (X1X2) of both components are derived from the equations of stationary and non‐stationary cathode spot models in a first approximation. These rates depend mainly on thermal properties of the metal, the atomic mass and the ionization state of the cathodic plasma. The calculated total gross ratesXtare between 67 μg/As (Be) and 3300 μg/As (Bi); the measured net rates (X̃) amount to about 10% ⃛30% of these gross rates. The range of the ratioX2/X1=vis 0,56 (Cd) ≦v≦ 2,64 (Mo). The various gross ratesX1.2tare strongly correlated with the net rates X̃ the relative rms deviations σrelfrom a power law fit are between about 15% and 30%. Resistive heating results in a worse correlation of the rates than ion impact heating. Probable causes of the deviations from exact functional dependencies a

ISSN:0005-8025    

DOI:10.1002/ctpp.19800200105

出版商:WILEY‐VCH Verlag    

年代:1980

数据来源: WILEY

ISSN:0005-8025    

DOI:10.1002/ctpp.19800200101

出版商:WILEY‐VCH Verlag    

年代:1980

数据来源: WILEY