摘要:

AbstractThe impact of individual collision processes on the relaxation of the velocity distribution function of a group of electrons, initially localized in a narrow region at relatively high energies, has been studied. By having recourse to solutions of the non‐stationary Boltzmann equation and to corresponding Monte‐Carlo simulations, the temporal behaviour of electrons in CO2plasmas, both in the absence and the presence of an external dc field, has been investigated. A microphysical interpretation of observed relaxation phenomena, based on the data relevant to the individual collision processes, is also gi

ISSN:0863-1042    

DOI:10.1002/ctpp.2150310502

出版商:WILEY‐VCH Verlag    

年代:1991

数据来源: WILEY

摘要:

AbstractThe impact of a secondary electron beam, generated at the electrodes and accelerated in the sheaths, on the self‐consistent treatment of the electron behaviour in an rf bulk plasma has been investigated by a parametric study. Source of electrons in the plasma are collisional ionization and secondary electron injection.Electrons are lost by ambipolar diffusion to the electrodes of a parallel plate rf discharge configuration. The non‐stationary Boltzmann equation is used to determine self‐consistently the rf field amplitude necessary for maintaining the steady‐state rf bulk plasma as well as the time resolved behaviour of the electron energy distribution function and of all contributions to the electron particle and power balance, at given source rate and energy distribution of secondary electron in

ISSN:0863-1042    

DOI:10.1002/ctpp.2150310503

出版商:WILEY‐VCH Verlag    

年代:1991

数据来源: WILEY

摘要:

AbstractA collisionless plasma in the presence of two monochromatic electric fields is considered. By means of a kinetic analysis, a dispersion relation that governs the excitation of transverse electromagnetic fluctuations is derived and analysed.

ISSN:0863-1042    

DOI:10.1002/ctpp.2150310504

出版商:WILEY‐VCH Verlag    

年代:1991

数据来源: WILEY

摘要:

AbstractThis paper presents an investigation of the growth of a radially symmetrical ripple, superimposed on a Gaussian laser beam in a collisionless magnetoplasma. Here we have presented the effect of magnetic field and the intensity of the laser beam on the growth of ripple in some detail. The effect of presence of ripple on the excitation of an ion‐acoustic wave is also investigated. Coupling of a weak ion‐acoustic wave with main laser beam is through modified background density. Interesting feature of the analysis is that the combined effect of increased intensity of the laser beam and magnetic field is observed to suppress the growth of the ripple as well as the excitation of the ion‐acoustic

ISSN:0863-1042    

DOI:10.1002/ctpp.2150310505

出版商:WILEY‐VCH Verlag    

年代:1991

数据来源: WILEY

摘要:

AbstractThe development of Buneman kinetic instability in plasma with hot electrons and cold ions is investigated in the quasilinear approximation at current velocites close to the instability threshold values. It is shown that the contribution of electron's dielectric permeability in the dispersion equation is negligible and that quasilinear theory has in general stabilizing effect.

ISSN:0863-1042    

DOI:10.1002/ctpp.2150310506

出版商:WILEY‐VCH Verlag    

年代:1991

数据来源: WILEY

摘要:

AbstractThe influence of high electric fields on the distribution function and following on the dielectric constant is considered in the framework of nonequilibrium Greenfunction technique. In the partial ionized H‐plasma additional plasma‐poles occur due to the field, which become field dependent. The existence of 2 maxima in the distribution function results in additional damping and turbulent regi

ISSN:0863-1042    

DOI:10.1002/ctpp.2150310507

出版商:WILEY‐VCH Verlag    

年代:1991

数据来源: WILEY

摘要:

AbstractA partially ionized hydrogen plasma is considered in high electric fields. The influence of the field on the electron distribution function is described by solving the Boltzmann‐equation in Fokker‐Planck approximation. Three‐particle processes like exitation are included. With the help of the distribution function the field — behaviour is seen and the macroscopic values like kinetic energy, conductivity and runaway‐electrons are calculated explicitly. The heating up of the plasma and the break down of the system

ISSN:0863-1042    

DOI:10.1002/ctpp.2150310508

出版商:WILEY‐VCH Verlag    

年代:1991

数据来源: WILEY

ISSN:0863-1042    

DOI:10.1002/ctpp.2150310509

出版商:WILEY‐VCH Verlag    

年代:1991

数据来源: WILEY

ISSN:0863-1042    

DOI:10.1002/ctpp.2150310510

出版商:WILEY‐VCH Verlag    

年代:1991

数据来源: WILEY

摘要:

AbstractA model is proposed for the formation of the electron energy distribution in a hollow cathode discharge. On the basis of this model, an integral equation has been derived to calculate the electron distribution function over the entire cathode cavity volume. The equation holds true for both the isotropic distribution, and the case when the local distribution function is anisotropic. Solutions of the kinetic equation obtained are presented, for electron energies over 2–3 eV and up to the cathode fall potential. It is shown that the electron energy distribution function in this interval determines the optical characteristics of the hollow cathode discharge. A comparison is given of the calculated and measured radiation powers for the cases of the hollow cathode discharge in xenon and carbon dioxide. The discrepancy between the theoretical and experimental data does not exceed 20

ISSN:0863-1042    

DOI:10.1002/ctpp.2150310511

出版商:WILEY‐VCH Verlag    

年代:1991

数据来源: WILEY