Toroidal transport measurement of laser injected impurities in TEXTOR

Impurity injection is often used tool for tokamak plasma investigations. THe toroidal spread of the laser blow-off injected particles is discussed. As the toroidal spread of the injected particles is a fast process (this is in the hundred microsecond scale), only the low ionized stages of the injected elements play role in the distribution. Two different elements, lithium and aluminium, were injected into TEXTOR tokamak, and the distribution in time and space for different low ionization stages of both elements was measured for different types of injection. An overview of the experimental set-up is given. The results of the toroidal distribution measurements in the vicinity of the injection are described, as well as the toroidal delay investigations far from the place of the injection. (K.A.) 8 refs.; 19 figs.; 1 tab