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Simulation study of the effect of recombination processes in an expanding plasma

Published online by Cambridge University Press:  26 September 2005

TUDOR NEDELEA ,
BORIS BRIEHL  and
HERBERT M. URBASSEK
TUDOR NEDELEA
Affiliation:
Fachbereich Physik, Universität Kaiserslautern, Erwin-Schrödinger-Straße, D-67663 Kaiserslautern, Germany ([email protected])
BORIS BRIEHL
Affiliation:
Fachbereich Physik, Universität Kaiserslautern, Erwin-Schrödinger-Straße, D-67663 Kaiserslautern, Germany ([email protected])
HERBERT M. URBASSEK
Affiliation:
Fachbereich Physik, Universität Kaiserslautern, Erwin-Schrödinger-Straße, D-67663 Kaiserslautern, Germany ([email protected])
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Abstract

Using particle-in-cell computer simulation, the processes occurring in a plasma formed by isothermal evaporation of ions and electrons off a planar wall are studied. A simple model to implement three-body recombination is introduced into this scheme; it fulfills momentum and energy conservation and obeys the well-known dependences of the recombination rate on density and temperature. Ion acceleration processes are investigated, during both the particle emission phase and afterwards, during expansion into vacuum. Recombination strongly enhances ion acceleration, since due to the recombination-heated electron subsystem the expansion-front space-charge field is increased. Spatial segregation of the neutral gas cloud and the plasma cloud is demonstrated.

Type
Papers
Information
Journal of Plasma Physics , Volume 71 , Issue 5 , October 2005 , pp. 589 - 609
Copyright
2005 Cambridge University Press

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