Detection of kinetic geodesic acoustic mode (KGAM) near the center region of JIPPT-IIU tokamak plasmas / by Hamada, Y., author, Watari, T., author, Nishizawa, A., author, Yamagishi, O., author, Narihara, K., author, Ida, K., author, Kawasumi, Y., author, Ido, T., author, Toi, K., author, Kojima, M., author, National Institute for Fusion Science