The 2D particle-in-cell method based model of a negative ion source is presented. The spatial distributions of electrostatic potential and plasma component densities are presented. Changes of negative ion distribution… Click to show full abstract
The 2D particle-in-cell method based model of a negative ion source is presented. The spatial distributions of electrostatic potential and plasma component densities are presented. Changes of negative ion distribution and potential as well as the extracted H− current with the plasma grid bias voltage are investigated. The presence of the potential well near the plasma grid surface that traps the negative ions is shown. Increase of the H− ions density inside the chamber with the negative bias voltage is demonstrated. Influence of the H− ion flux outgoing from the plasma grid on the extracted current was checked: increase by factor 2 is observed when the flux rises 4 times. Current–voltage characteristics of the ion source are presented, saturation of the curve is observed above 50 kV
Journal Title: Acta Physica Polonica A
Year Published: 2017
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