Abstract
Hydrogen retention characteristics of graphite divertor tiles used in JT-60 for hydrogen discharge period were investigated by the thermal desorption spectroscopy. Most of the tiles were covered with re-deposited layers of the maximum thickness of 70μm. Total amount of hydrogen desorbed from each tiles was proportional to the thickness of the re-deposited layer on the tiles. Hydrogen desorption from substrate determined after the removal of the re-deposited layer was quite small compared to that from the re-deposited layers. Assuming homogeneous hydrogen distribution in the re-deposited layers, H/C ratio in the re-deposited layer was approximately 0.015. This is much smaller than those observed in JET and other devices. The re-deposited layers are very likely subjected to high temperatures because of their poor thermal contact to the substrate owing to their porous structure.
Sign-in/Register to access full text options 
Talk to us
Join us for a 30 min session where you can share your feedback and ask us any queries you have
Schedule a callDisclaimer: All third-party content on this website/platform is and will remain the property of their respective owners and is provided on "as is" basis without any warranties, express or implied. Use of third-party content does not indicate any affiliation, sponsorship with or endorsement by them. Any references to third-party content is to identify the corresponding services and shall be considered fair use under The CopyrightLaw.
