Externally driven global alfvén eigenmodes applied for effective mass number measurement on TCABR - Puglia, Paulo Giovane Paschoali Pereira; Ruchko, Leonid Fedorovich; Ronchi, Gilson; Elfimov, Artour G; Galvão, Ricardo Magnus Osório; Guimarães Filho, Zwinglio de Oliveira (PHYSICS OF PLASMAS, 2014)