Electron cyclotron resonance heating (ECRH) has become an attractive techni
que in today's fusion experiments not only as a heating mechanism but also
as a diagnostic tool and a way to induce controllable currents through elec
tron cyclotron current drive (ECCD). In this paper we show, using ray traci
ng simulations, how one can address all these issues with the ECRH system d
esigned for the TJ-II stellarator. This ECRH set up consists of two 500 kW
gyrotrons at f = 53.2 Ghz coupled to the plasma through two quasi-optical t
ransmission lines, placed at two stellarator symmetric positions, and equip
ped with an internal steerable mirror. Using the three-dimensional (3D) Ham
iltonian ray tracing code, TRECE, almost full single-pass absorption with l
ocalized power deposition is found for both on- and off-axis heating for an
y magnetic configuration. The simulations also show that it is possible to
induce an appreciable ECCD despite the small oblique incidence angles attai
nable with the movable mirrors because of the rapid variation of the magnet
ic field direction and strength with the toroidal angle in TJ-II.