LAUSR

breaking in tokamak plasmas Z. X. Lu, X. Wang, A. Bottino, E. Fable, W. Hornsby, Ph. Lauber, F. Zonca, C. Angioni Max-Planck-Institut f?̈?r Plasmaphysik, Garching, Germany C.R. ENEA Frascati C.P. 65, 00044 Frascati, Italy The symmetry breaking of the mode structure, as described by finite flux surface averaged parallel wavenumber 〈k||〉 and poloidal angle 〈θ〉, is important for estimating the off-diagonal component of momentum flux [1]. Energetic particles (EPs) bring in new features of symmetry breaking and in turn, the EP behaviors can be affected by symmetry breaking [2]. In this work, theoretical methods are developed and simulations are performed to study the symmetry breaking of the ion temperature gradient (ITG) mode and beta induced Alfvén eigenmode (BAE). The results are compared with ORB5 and GKW for ITG and XHMGC for BAE.