Analysis of spiky net toroidal current in the magnetized toroidal plasma from the point of view of helicity conservation

It has been observed that 'runaway oscillations' in the toroidal current of the magnetized resistive toroidal plasma may cause continuous tearing acti vity, resulting in 'spiky' net toroidal current and modulation of toroidal and poloidal magnetic fields of the plasma with a definite phase relationsh ip, depending upon the magnitude of vertical magnetic field. The present ex perimental results on current decay and recovery are explained from the poi nt of view of helicity conservation.