Observation of multiple-peaked structure in the time-of-flight spectrum ofthe Sinp-tokamak discharge

In the present article a multiple-peaked structure in the time-of-flight (T OF) spectrum obtained in a TOF analyzer system installed in the Sinp-tokama k has been reported. An explanation of the nature of the measured TOF spect rum has been given on the basis of a proposed model describing acceleration , in the radial direction, of radially diffusing ions in the ambipolar elec tric field. It is concluded that the particle diffusion across the magnetic field as a result of acceleration by the dynamic ambipolar electric field and charge-exchange collisions can be studied by a TOF analyzer system coup led with a research tokamak. (C) 1999 American Institute of Physics. [S0034 -6748(99)67101-5].