Physics – Atomic Physics
Scientific paper
2008-11-18
Phys.Rev.ST Accel.Beams 12:073501,2009
Physics
Atomic Physics
29 pages, 13 figures
Scientific paper
10.1103/PhysRevSTAB.12.073501
The ion production in an ECRIS is modelled using a particle-in-cell Monte-Carlo collision code in a three-dimensional geometry. Only the heavy particles (ions and atoms) are tracked, with the electron density determined from the requirement of quasi-neutrality, and the electron temperature is a free parameter. The electric fields in the plasma are assumed to be negligibly small, and the ion confinement due to a "potential dip" is neglected. It is found that experimentally observed features of ECRIS plasma are closely reproduced by the code, including the charge-state-distributions of extracted ion beams and sputtering patterns inside the source. The isotope anomaly is observed for the mixture of 20Ne + 22Ne isotopes, and some explanation for the effect is given. Possible connection between the wall-coating effect and parameters of the fast atoms created in collisions of the ions with the walls is discussed.
Beijers J. P. M.
Mironov Vladimir
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