Heat flux deposition pattern on the inner first wall of Tore Supra

R Mitteau (1) , M Chantant (1) , P Chappuis (1) , D Guilhem (1) , M Lipa (1)

1 IRFM - Institut de Recherche sur la Fusion par confinement Magnétique

The Inner First Wall (IFW) is the main limiter in Tore Supra for long and powerful discharges. The original graphite IFW was partly damaged by 8 years of operation and a sector of 60° was replaced between 1995 and 1997 by CFC brazed elements. They are designed to accept twice as much flux (2 MW/m²) as the older ones and are expected to be more resilient. The new elements gave the opportunity to install diagnostics (thermocouples and langmuir probes) on a poloidal sector, to characterise the behaviour of the new IFW and especially the heat flux profile. The pattern doesn't follow the cosine law and is governed by strong perpendicular heat flux and abnormal deposition at the contact point between the limiter and the plasma. The most energetic shots of the last campaign showed that the IFW could be loaded with twice the power deposited during these shots.

Domaines: Physique des plasmas [physics.plasm-ph]; Plasmas

R Mitteau, M Chantant, P Chappuis, D Guilhem, M Lipa. Heat flux deposition pattern on the inner first wall of Tore Supra. 20th symposium on Fusion Technology, Sep 1998, Marseille, France. ⟨cea-03229616⟩