In this paper, conditioning procedures presently used in tokamaks are descr
ibed. Long discharge operation has been achieved in the Tore Supra. Moreove
r, Tore Supra is the only Tokamak in the world which operates with a perman
ent magnetic held as foreseen in future fusion reactors. Normal glow discha
rge conditioning appears to be inefficient in this case. Therefore, special
conditioning procedures have been developed at Tore Supra which are addres
sed in this paper. (C) 2001 Elsevier Science Ltd. All rights reserved.