Tungsten ion source under double-pulse laser ablation system
Khalil Ahmed Asaad I1, †, Hafez Ashraf I2, Elgohary Mahmoud E3, 4, Morsy Mohamed A5
       

(color online) Variations of applied breakdown voltage of the W plasma with Ar-gas pressure at various distances 1, 2, and 3 cm between the two electrodes.