The conditioning procedures in Tore Supra after CIEL implementation

After nearly two years of shutdown for the installation of the new inner components of CIEL project, standard conditioning procedures have been carried out (bakeout, D2GDC and HeGDC) with a new glow discharge cleaning (GDC) hardware. 50 g of water and 20 g of hydrogen were removed during the initial bakeout and 650 A h of D2GDC and 100 A h of HeGDC have allowed plasma restart. CO production during D2GDC, about three times higher than in HeGDC, showed a strong dependence on the wall temperature in the 150–200 °C range. Furthermore, it has been possible to restart plasmas after different de-conditioning events when the CO production rate reaches 4×1016 molecules/s/A at 200 °C wall temperature. However, D2GDC led to the removal of large amount of carbon (∼2×1024 eroded carbon atoms/year). Besides, HeGDC was successfully used to decrease deuterium wall concentration after D2GDC. The time evolution of the isotopic ratio was found to decrease from 100% to about 60% at the end of the campaign.