A simple one-dimensional model describing the spread of laser blow-off
injected ions along the magnetic field lines is presented. The model
is based on the kinetic theory. A closed set of kinetic equations that
contain a Coulomb collision term is solved numerically. For impurity
density less than the plasma density, the effect of the ambipolar elec
tric field is negligible, as shown. The results of the model calculati
on are compared with experimental results obtained on the Tokamak Expe
riment for Technically Oriented Research (TEXTOR) [H. Soltwisch et al.
, Plasma Phys. Controlled Fusion 26, 23 (1984)] tokamak by the use of
injection of lithium atoms, and the agreement is satisfactory. The res
ults of the model and possible applications for diagnostic purposes ar
e discussed in detail. (C) 1996 American Institute of Physics.