A wall-stabilized arc chamber has been built to make spectroscopic measurem
ents in order to study thermal plasmas. An experimental design method has b
een carried out in order to control and to optimize all experimental setup
parameters. Pure Ar, Ar-CO2, and Ar-N-2 mixtures have been used to test tim
e reliability and homogeneity of the plasma. (C) 2000 American Institute of
Physics. [S0034-6748(00)00808-X].