DocumentCode :
2682863
Title :
Particle simulations of transport in a high-recycling divertor scrape-off layer
Author :
Procassini, R.J. ; Birdsall, C.K. ; Cohen, Bruce I.
fYear :
1990
fDate :
21-23 May 1990
Firstpage :
122
Abstract :
Summary form only given. The transport of particles and energy through a tokamak scrape-off layer (SOL,) was studied via the particle simulation code DIPSI (Direct Implicit Plasma Surface Interactions). This code combines direct-implicit particle-in-cell (PIC) techniques with Monte Carlo models for Coulomb collisions and charged/neutral atomic physics interactions. Recycled neutral particles are treated in an ad hoc manner: the density is assumed to decay exponentially with increasing distance from the divertor plate and the temperature of the neutrals is prescribed by the user. The neutral particles interact with the background plasma via charge-exchange events with ions and impact ionization events arising from electron/neutral collisions. This model is used to determine the effect of charged/neutral interactions on the transport properties of a tokamak SOL plasma. The prescribed neutral particle density will span a wide range of recycling fractions. Values of the presheath and collector sheath potential drops, plasma temperature, flow velocity, and parallel heat fluxes were obtained as a function of charged/neutral collisionality
Keywords :
Monte Carlo methods; plasma collision processes; plasma simulation; plasma transport processes; Coulomb collisions; DIPSI; Monte Carlo models; atomic ions; charged particle; collector sheath potential drops; collisionality; direct implicit plasma surface interactions; direct-implicit particle-in-cell; energy transport; exponential decay; flow velocity; high-recycling divertor scrape-off layer; impact ionization; neutral atoms interaction; parallel heat fluxes; particle simulation; particle simulation code; particle transport; presheath; recycled neutral particle; recycling fractions; temperature; tokamak;
fLanguage :
English
Publisher :
ieee
Conference_Titel :
Plasma Science, 1990. IEEE Conference Record - Abstracts., 1990 IEEE International Conference on
Conference_Location :
Oakland, CA, USA
Type :
conf
DOI :
10.1109/PLASMA.1990.110602
Filename :
5725878
Link To Document :
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