In this work

attenuation of the injected diagnostic neutral beam in different electron temperatures

electron densities

and impurity concentrations of the target plasma in HT-7 tokamak was calculated by considering effects of the three basic atomic processes

i.e. ionization

recombination and charge-exchange. The results show that the attenuation depends strongly on the plasma density and beam energy

but the plasma temperature has less effect. The attenuation of the diagnostic neutral beam in the EAST plasma has been estimated based on the same principle

and the required parameters for the EAST diagnostic neutral beam are given as well.