Abstract
Extraction of negative hydrogen ions from a plasma is analyzed with a view to the description of the extraction region of the negative hydrogen ion-beam sources developed for additional heating of fusion plasmas. The numerical procedure introduced in the study is a modification of the indirect Poisson–Vlasov method. It uses a condition for the plasma meniscus and employs analogy with the particle-in-cell model simulation. The analysis of the results shows that the charged particle velocity distribution at the entrance of the extraction region influences the properties of the extracted beams and its effect should be considered when conditions for well converged beams are looked for through variation in the plasma density and in the potentials of the electrodes of the extraction system.
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