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Analysis of the Bohm Criterion for Two‐Ion‐Species Plasmas Using PARASOL
Author(s) -
Azuma S.,
Fukuyama A.,
Takizuka T.
Publication year - 2012
Publication title -
contributions to plasma physics
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 0.531
H-Index - 47
eISSN - 1521-3986
pISSN - 0863-1042
DOI - 10.1002/ctpp.201210041
Subject(s) - collisionality , divertor , plasma , ion , atomic physics , particle (ecology) , physics , flow (mathematics) , mechanics , materials science , computational physics , nuclear physics , tokamak , quantum mechanics , oceanography , geology
In SOL‐divertor plasmas, a condition on the plasma flow velocity, called the Bohm criterion, is required for the formation of a stable sheath in front of a divertor plate. While, for a single‐ion species, the usual analytical procedure gives the criterion as a unique solution for the incident ion flow velocity, for two‐ion‐species plasmas the procedure results in a relation between the ion flow velocities. We carried out full particle simulations with a one‐dimensional particle code PARASOL, and clarified in detail the dependence of the condition for two‐ion‐species plasmas on collisionality and ions mass (© 2012 WILEY‐VCH Verlag GmbH & Co. KGaA, Weinheim)