摘要:

AbstractParametric excitations of electrostatic convective cells by drift waves as well as magnetostatic cells by Alfvén waves are considered. The growth rates are calculated for various limits of interest to plasma diffusion studies; our results agree with computer simulations. The problem of crossfield diffusion is also discussed. Finally, the coupling of magnetostatic modes with electrostatic modes is investigated and a variational principle for coalescence of magnetic islands is formulated

ISSN:0005-8025    

DOI:10.1002/ctpp.19810210602

出版商:WILEY‐VCH Verlag    

年代:1981

数据来源: WILEY

摘要:

AbstractA model of the breakdown in high pressure gases is presented taking into consideration the finite voltage rise time at the discharge electrodes and a finite initial charge carrier density in the gap. Several types of breakdown could be distinguished important for several applications. Thus, the range of existence of high pressure laser discharges at a given preionization density and circuit parameters can be calculated. Moreover, the change in the breakdown characteristics of high pressure gases at high temperatures is explained. This behaviour seems to be important for understanding the physical processes in circuit breaker chambers.

ISSN:0005-8025    

DOI:10.1002/ctpp.19810210603

出版商:WILEY‐VCH Verlag    

年代:1981

数据来源: WILEY

摘要:

AbstractIn dieser Arbeit wird die experimentelle Bestimmung der Rauschtemperatur und der Elektronendichte behandelt. Die Plasmaparameter wurden mit Hilfe der Mikrowellen‐Resonatormethode im Druckbereich zwischen Diffusions‐ und Freifallbedingungen bestimmt. Die Berechnungen der Rauschtemperatur und der Elektronendichte erfolgten überwiegend mit den aus der Boltzmann‐Gleichung für Elektronen erhaltenen Energieverteilungsfunktionen. Es treten größere Abweichungen zwischen den gemessenen und berechneten Werten auf, wenn die mittlere freie Weglänge der Elektronen mit den Abmessungen des Entladungsrohres vergleichbar wird. Diese Unterschiede können durch eine erhöhte Wechselwirkung zwischen den Randschichtschwingungen und dem Plasma hervorge

ISSN:0005-8025    

DOI:10.1002/ctpp.19810210604

出版商:WILEY‐VCH Verlag    

年代:1981

数据来源: WILEY

摘要:

AbstractMeasurements have been accomplished of wall charge distributions and total charges which were generated in Ne—N2‐filled discharge cells with insulated electrodes under the impact of ultraviolet irradiation and of bipolar pulse sequences. The non‐self‐maintained pulse discharge, generated by means of UV‐light, leads to a build‐up or destruction of wall charges in dependence of the efficient gap voltage. In the course of the discharge sequences wall charge transients, similar to those in ac plasma displays, are produced. Discussion of wall voltage transfer curves shows the dependency of discharge activity in the gap on the charging conditions of the insulating surfaces, placed in front of the

ISSN:0005-8025    

DOI:10.1002/ctpp.19810210605

出版商:WILEY‐VCH Verlag    

年代:1981

数据来源: WILEY

摘要:

AbstractAmong the dissociation products of a r.f. discharge in CCl4‐vapour the radicals CCl3and Cl2‐ have been identified by EPR‐spectroscopy after condensation at 80 K.The gas‐phase reaction CCl3+ O2→ CCl3OO has been used to estimate the CCl3concentration to be approximately 5 · 1013radicals/cm3atp CCl 4= 55 Pa. The life‐time of CCl3‐radicals is governed by the rate of desactivation of some exited species (eg. CCl4*) via.At a pressurep CCl 4= 55 Pa a half‐life of CCl3‐radicals of

ISSN:0005-8025    

DOI:10.1002/ctpp.19810210606

出版商:WILEY‐VCH Verlag    

年代:1981

数据来源: WILEY

ISSN:0005-8025    

DOI:10.1002/ctpp.19810210601

出版商:WILEY‐VCH Verlag    

年代:1981

数据来源: WILEY