摘要:

AbstractGlobal behavior of field line diffusion in a stochastic magnetic field is obtained. Stochastic motion of particles undergoing mutural random collisions in the stochastic magnetic field is studied for the whole time range. The field line as wel as the particle diffusion coefficients are calculated to the sixth order of the relative magnitude of the fluctuating magnetic field.

ISSN:0863-1042    

DOI:10.1002/ctpp.2150360502

出版商:WILEY‐VCH Verlag    

年代:1996

数据来源: WILEY

摘要:

AbstractAn efficient method for solving the inhomogeneous electron Boltzmann equation for a weakly ionized collision dominated plasma is represented. As a first application this method is used to investigate in a helium plasma the response of the electron velocity distribution function and of the relevant macroscopic quantities to the impact of spatially limited disturbances in the electric field. In addition to the field action elastic and (conservative) inelastic collisions of electrons with gas atoms are taken into account in the kinetic treatment. In this way the spatial relaxation behaviour of the electrons and their establishment into homogeneous plasma states could be studied on a strict kinetic basis. Unexpectedly large relaxation lengths in electron acceleration direction have been found at medium electric fields.

ISSN:0863-1042    

DOI:10.1002/ctpp.2150360503

出版商:WILEY‐VCH Verlag    

年代:1996

数据来源: WILEY

摘要:

AbstractSurface‐wave gas discharges sustained under the conditions of a diffusion controlled regime are studied on the basis of the fluid plasma model. The self‐consistent behaviour of the plasma density and of the field intensity along the discharge length is obtained. It is shown that the nonlinearity in the particle balance equation due to stepwise ionisation determines the plasma density in terms of the field intensity and ensures self‐consistent behaviour of the wave ⟺ discharge characteristics in a diffusion controlled

ISSN:0863-1042    

DOI:10.1002/ctpp.2150360504

出版商:WILEY‐VCH Verlag    

年代:1996

数据来源: WILEY

摘要:

AbstractProfiles of the Balmer linesDa(Ha),Dβ(Hβ) andDγ(Hγ) have been measured in the scrape‐off layer and within the edge of the TEXTOR (upgrade) plasma, under Ohmic conditions and with neutral‐beam injection. Each line profile shows a strong Zeeman effect in the vicinity of line centre, and a marked central dip when mainly the σ components are observed. The line core evidently originates from cold atoms in the edge plasma, excited in the course of molecular dissociation, while the broad pedestal on which the core rests is radiated by excited atoms produced through charge‐exchange recombination of deuterons (protons), transported outwards from the much hotter plasma interior, and by atoms heated directly by collisions with the deuterons (protons). Core temperatures of about 0.5 eV and less are obtained from line profil

ISSN:0863-1042    

DOI:10.1002/ctpp.2150360505

出版商:WILEY‐VCH Verlag    

年代:1996

数据来源: WILEY

摘要:

AbstractAlthough the plasma‐chemical processes and properties of the deposited thin film can strongly depend on the interaction of the supersonic plasma jet channel with the substrate, up to now the study of this phenomenon has not yet been done. We decided to study this interaction by means of CCD camera. The presented results indicate that the light intensity recorded close to the substrate can be used as a measure of the intensity of plasma‐chemical deposition processes on the substrate surf

ISSN:0863-1042    

DOI:10.1002/ctpp.2150360506

出版商:WILEY‐VCH Verlag    

年代:1996

数据来源: WILEY

摘要:

AbstractTime integrated measurements of the line emission of hydrogen‐like and helium‐like neon from a dense plasma focus device were performed. Relative intensities of Lyman‐series emission fromNe Xwere measured end‐on and side‐on showing strong deviation from thermal equilibrium and indicating substantial population inversion between levelsn=

ISSN:0863-1042    

DOI:10.1002/ctpp.2150360507

出版商:WILEY‐VCH Verlag    

年代:1996

数据来源: WILEY

摘要:

AbstractThe back‐corona discharge has been successfully applied as a plasma source for decomposition of NO2in the oxygen‐free gas mixture of N2:NO2. The paper reports a first attempt to use back‐corona discharge for noxious gas conversion. The preliminary results of laboratory experiments in a needle‐to‐plate reactor show that the De‐NOxprocesses in back‐corona discharge are similar to the dc streamer corona discharges generated in the same geometry. Both types of discharges convert NO2to nitrogen, oxygen and also to N2O and NO. However, back‐corona discharge produces less NO, and is more efficient energetically in NOxdecomposition than the dc streamer c

ISSN:0863-1042    

DOI:10.1002/ctpp.2150360508

出版商:WILEY‐VCH Verlag    

年代:1996

数据来源: WILEY

摘要:

AbstractThe plasma of a hollow cathode arc discharge (argon/titanium) was studied by emission spectro‐scopy and probe measurements. The behavior of the relative particle concentrations of the different heavy plasma components as well as the concentration and temperature of the electrons was determined as function of the vertical distance from the anode crucible.Abel‐inverted radial distributions of the relative level populations forTiI(neutral titanium),TiII(singly ionized titanium),Ar IandArIIare presented. Further measurements characterize the influence of the discharge current on the relative level populat

ISSN:0863-1042    

DOI:10.1002/ctpp.2150360509

出版商:WILEY‐VCH Verlag    

年代:1996

数据来源: WILEY

ISSN:0863-1042    

DOI:10.1002/ctpp.2150360510

出版商:WILEY‐VCH Verlag    

年代:1996

数据来源: WILEY

ISSN:0863-1042    

DOI:10.1002/ctpp.2150360501

出版商:WILEY‐VCH Verlag    

年代:1996

数据来源: WILEY