Ion temperature and poloidal rotation profiles for NBI heated plasma in CHS

Ion temperature and poloidal rotation velocity profiles are measured with 68 channel space resolved spectrometer using beam emission spectroscopy technique in CHS. The electric field near the plasma edge (r = 0.7 a, a is averaged minor radius) derived from poloidal rotation velocity is 15 V/cm for low density 28 GHz ECH plasma, and -35 V/cm for high density NBI plasma. The peak of the ion temperature is shifted from the vacuum magnetic axis by up to 4 cm. This shift depends on the location of the magnetic axis and becomes larger as the magnetic axis moves toward the tangential major radius of the heating neutral beam. This shift is larger than that estimated from finite β calculation by a factor of two or less. Presumably the shift is due to a significant parallel beam pressure as well as thermal component. (author)