摘要:

AbstractFrom the balance equations for partial quantities we derive equations for lumped quantities, e.g. a generalized Ohm's law. They are especially useful for a three‐component system (electrons, one species of ions and neutral particles). Certain conditions are derived and investigated to describe a plasma with more than three components by the lumped quantitie

ISSN:0005-8025    

DOI:10.1002/ctpp.19810210202

出版商:WILEY‐VCH Verlag    

年代:1981

数据来源: WILEY

摘要:

AbstractInfluences of an axial magnetic field on the ionization wave and the positive column in rare gas discharges are studied experimentally. The upper critical currentIcfor the appearance of ionization waves in the magnetic fieldBis newly found. AsBis gradually increased, the value ofIeslightly increases from the Pupp's value and after passing a prominent maximum, finally become very small. In addition an anomaly takes place in the axial electric fieldEof the positive column stable for helical instabilities. With increasing the magnetic field the value ofEgoes through a weak maximum before decreasing. It is concluded that this anomaly, apparently incompatible with classical diffusion theory, is closely related to the appearance of ionization waves in the positive column.

ISSN:0005-8025    

DOI:10.1002/ctpp.19810210203

出版商:WILEY‐VCH Verlag    

年代:1981

数据来源: WILEY

摘要:

AbstractOn the basis of the electron Boltzmann equation and of the balances for the charge carriers (e, H+, H2+, H3+), the H‐atoms and the metastable H(2s)‐atoms for the H/H2‐mixture the behaviour of the weakly turbulent, band‐like electron‐beam discharge plasma in hydrogen has been calculated taking into account the main collision and transport processes. In dependence of the normalized discharge length, the life time of the neutral particles in the band‐like plasma and the electron beam generated turbulence energy density the ionization and dissociation budget and in particular the most important electron‐heavy particle collision rates, which appear in the balance equation system, are investigated in the present part of our paper. In a second part the results related to the budget of the ions and the metastable atomic state will be reported and an analysis of the main processes in the balances

ISSN:0005-8025    

DOI:10.1002/ctpp.19810210204

出版商:WILEY‐VCH Verlag    

年代:1981

数据来源: WILEY

摘要:

AbstractThe paper deals with the dissociation of carbon dioxide in nonequilibrium plasma of a stationary plasma‐beam discharge. Experimental results of spectroscopic and probe measurements of plasma parameters are given. Moreover, a mass‐spectrometric analysis of gaseous products of the chemical reactions is presented. In addition the measurement of the deposition rate of solid products by means of a quartz oscillator is described.The results show that plasma beam discharge is an effective tool for inducing plasma‐chemical reac

ISSN:0005-8025    

DOI:10.1002/ctpp.19810210205

出版商:WILEY‐VCH Verlag    

年代:1981

数据来源: WILEY

摘要:

AbstractIn a magnetized hollow cathode arc rotational velocities of ions and neutrals and their temperatures were measured in axial and radial dependence. In comparison with theory experimental results give a detailed analysis of radial transport phenomena.

ISSN:0005-8025    

DOI:10.1002/ctpp.19810210206

出版商:WILEY‐VCH Verlag    

年代:1981

数据来源: WILEY

摘要:

AbstractThe cathode spots from vacuum arcs on 316 stainless steel are compared with the tracks found on the same material after exposure to the plasma of the tokamak TFR 600. Further the erosion yields of vacuum arc cathodes of 316 stainless steel and titanium are determined from experiments and the measured values are compared with theoretical estimates. The velocity of the arc is investigated as a function of the applied magnetic cross‐field. The scatter of both, the velocity data and the erosion yields is substantial. Improved experiments are planne

ISSN:0005-8025    

DOI:10.1002/ctpp.19810210207

出版商:WILEY‐VCH Verlag    

年代:1981

数据来源: WILEY

摘要:

AbstractCraters caused by unipolar arcs on stainless steel depend strongly on surface conditions. There are three diameter distributions: Small craters (∼ 0.3 μm) for oxidised surfaces, larger craters (∼ 2 μm) for moderately cleaned areas, and very large craters (∼ 20 μm) for clean surfaces. These values are compatible with Joule heating models of crater formation. Compared with other metals of interest, stainless steel shows the largest

ISSN:0005-8025    

DOI:10.1002/ctpp.19810210208

出版商:WILEY‐VCH Verlag    

年代:1981

数据来源: WILEY

ISSN:0005-8025    

DOI:10.1002/ctpp.19810210201

出版商:WILEY‐VCH Verlag    

年代:1981

数据来源: WILEY