Abstract

DALTRINI, A.M.; MACHIDA, M.; MONTEIRO, M.J.R.  and  KAMINISHIKAWAHARA, C. O.. Tokamak NOVA-UNICAMP recent results. Braz. J. Phys. [online]. 2002, vol.32, n.1, pp. 26-29. ISSN 0103-9733.  http://dx.doi.org/10.1590/S0103-97332002000100005.

Tokamak NOVA-UNICAMP is a small tokamak with iron core and conducting shell stabilization built to study plasma-wall interaction and optical diagnostic development. Characteristic plasma behavior was the appearance of 2-3 kHz spike oscillation during entire discharge with very high X-ray activity which prevent our optical diagnostic development. By modifying capacitance and charging voltage on OH and vertical field banks, in order to obtain similar discharge current shape, most of 2-3 kHz spikes has been taken out, although some activities still remains to be analyzed. Nevertheless, the high X-ray activity which jeopardize our optical measurements is completely eliminated and time varying parameter as ion temperature is now possible to be followed during whole discharge.