title: 2D surface temperature measurement of plasma facing components with modulated active pyrometry.
abstract: In nuclear fusion devices, such as Tore Supra, the plasma facing components (PFC) are in carbon. Such components are exposed to very high heat flux and the surface temperature measurement is mandatory for the safety of the device and also for efficient plasma scenario development. Besides this measurement is essential to evaluate these heat fluxes for a better knowledge of the physics of plasma-wall interaction, it is also required to monitor the fatigue of PFCs. Infrared system (IR) is used to manage to measure surface temperature in real time. For carbon PFCs, the emissivity is high and known (ɛ ∼ 0.8), therefore the contribution of the reflected flux from environment and collected by the IR cameras can be neglected. However, the future tokamaks such as WEST and ITER will be equipped with PFCs in metal (W and Be/W, respectively) with low and variable emissivities (ɛ ∼ 0.1-0.4). Consequently, the reflected flux will contribute significantly in the collected flux by IR camera. The modulated active pyrometry, using a bicolor camera, proposed in this paper allows a 2D surface temperature measurement independently of the reflected fluxes and the emissivity. Experimental results with Tungsten sample are reported and compared with simultaneous measurement performed with classical pyrometry (monochromatic and bichromatic) with and without reflective flux demonstrating the efficiency of this method for surface temperature measurement independently of the reflected flux and the emissivity.
authors.affiliation: CEA, IRFM, F-13108 Saint-Paul-lez-Durance, France.
authors.forename: S
authors.initials: S
authors.lastname: Amiel
authors.affiliation: CEA, IRFM, F-13108 Saint-Paul-lez-Durance, France.
authors.forename: T
authors.initials: T
authors.lastname: Loarer
authors.affiliation: CEA, IRFM, F-13108 Saint-Paul-lez-Durance, France.
authors.forename: C
authors.initials: C
authors.lastname: Pocheau
authors.affiliation: CEA, IRFM, F-13108 Saint-Paul-lez-Durance, France.
authors.forename: H
authors.initials: H
authors.lastname: Roche
authors.affiliation: CEA, IRFM, F-13108 Saint-Paul-lez-Durance, France.
authors.forename: E
authors.initials: E
authors.lastname: Gauthier
authors.affiliation: CEA, IRFM, F-13108 Saint-Paul-lez-Durance, France.
authors.forename: M-H
authors.initials: MH
authors.lastname: Aumeunier
authors.affiliation: Aix-Marseille Univ, IUSTI, UMR CNRS 7343, F-13453 Marseille, France.
authors.forename: C
authors.initials: C
authors.lastname: Le Niliot
authors.affiliation: Aix-Marseille Univ, IUSTI, UMR CNRS 7343, F-13453 Marseille, France.
authors.forename: F
authors.initials: F
authors.lastname: Rigollet
authors.affiliation: CEA, IRFM, F-13108 Saint-Paul-lez-Durance, France.
authors.forename: X
authors.initials: X
authors.lastname: Courtois
authors.affiliation: CEA, IRFM, F-13108 Saint-Paul-lez-Durance, France.
authors.forename: M
authors.initials: M
authors.lastname: Jouve
authors.affiliation: CEA, IRFM, F-13108 Saint-Paul-lez-Durance, France.
authors.forename: C
authors.initials: C
authors.lastname: Balorin
authors.affiliation: CEA, IRFM, F-13108 Saint-Paul-lez-Durance, France.
authors.forename: V
authors.initials: V
authors.lastname: Moncada