Fig. 1. Schematic of neutral region and high voltage sheath of mixed D⁺ and Ti²⁺ plasmas

Fig. 2. Sheath depth and electric-field strength as a function of ion density

Fig. 3. Sheath depth and electric-field strength as a function of D⁺ proportion

Fig. 4. Sheath depth and electric-field strength vs sheath-entering velocity of D⁺

Fig. 5. Sheath depth and electric-field strength vs sheath-entering velocity of Ti²⁺

Fig. 6. Sheath depth and electric-field strength as a function of accelerating voltage

Fig. 7. Current density components vs voltage (fixed sheath depth)

Fig. 8. Total current density and interface plasma density vs voltage (fixed sheath depth)

Fig. 9. Current density components vs voltage (fixed E_max)

Fig. 10. Total current density and interface plasma density vs voltage (fixed E_max)

Fig. 11. Stable operating region for extraction of mixed plasmas