A comparison of high heat flux (HHF) tested CFC/Cu materials of Tore Supra and Wendelstein 7-X plasma-facing components is performed in order to understand the different fatigue behavior of the bonding interface, in particular for the Tore Supra materials. The elemental distribution around the bonding layer and the chemical composition of the active element titanium are characterized by secondary ion mass spectrometry (SIMS) and X-ray photoelectron spectroscopy (XPS). The results show that the

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... mproved bonding of the Wendelstein 7-X target elements compared to the Tore Supra pump limiter elements is due to a modified silicon and titanium distribution at the bonding interface. However, the difference of the fatigue behavior between the two Tore supra components cannot be attributed to the bonding interface, since the elemental distribution and chemistry for these components are identical and no degradation is observed after extended heat flux exposure.