Ion currents of Cu-ion beams in a plasma sputter type negative ion source and its correlation with sputtering and negative ion formation - Mahinay, Christian Lorenz; Malapit, Giovanni; Ulano, April; Poral, Matthew; Mascariñas, Venice; Ramos, Henry (Proceedings of the 29th Samahang Pisika ng Pilipinas National Physics Congress, 2011)