Two-Dimensional Simulations of H- Ions Extraction
M. Turek
Maria Curie Skłodowska University in Lublin, pl. M. Curie-Skłodowskiej 1, 20-031 Lublin, Poland
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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.

DOI: 10.12693/APhysPolA.132.254
PACS numbers: 07.77.Ka, 07.05.Tp, 34.35.+a, 41.75.Ak, 41.75.Cn