“Particle-in-Cell with Monte Carlo Collisions Gun Code Simulations of a Surface-Conversion H^− Ion Source”, Commun. Comput. Phys., vol. 4, no. 3, pp. 659–674, Sep. 2008, Accessed: Feb. 26, 2026. [Online]. Available: https://global-sci.com/index.php/cicp/article/view/7421