The Problem of Tritium Retention in Fusion Devices

Layers are formed on many locations of the plasma facing wall tiles but also on areas with no direct plasma ion impact ( remote areas ). It turns out that understanding of the tritium-retention requires the understanding of the erosion of carbon, its local and global transport within the device and the details of the deposition mechanisms being responsible for the layer properties. 

In addition, important strategies to cope this problem are 

the development of carbon-free scenarios (see also Sect. 1.4.2) and 

to explore techniques for removal of hydrogen isotopes from C-deposits. 

Data needs and issues to be addressed with respect to tritium retention  

---