Impurity and MHD instability effect on saw-tooth oscillation in TCABR plasmas with Alfvén wave heating - Elfimov, Artour G; Germano, Társis M; Elizondo, Juan Iraburu; Kuznetsov, Yu K; Nascimento, Ivan Cunha; Reis, Ablicio Pires dos; Ruchko, Leonid Fedorovich; Sanada, Edson Kenzo; Sá, Wanderley Pires de; Severo, José Helder Facundo; Silva, Ruy Pepe da; Usuriaga Nájera, Omar Cipriano; et al. (Encontro Brasileiro de Física dos Plasmas, 2009)