Impact of helium implantation and ion-induced damage on reflectivity of molybdenum mirrors
A. Garcia-Carrasco , P. Petersson , A. Hallén , J. Grzonka , M.R. Gilbert , Elżbieta Fortuna-Zaleśna , M. J. Rubel
AbstractMolybdenum mirrors were irradiated with Mo and He ions to simulate the effect of neutron irradiation on diagnostic first mirrors in next-generation fusion devices. Up to 30 dpa were produced under molybdenum irradiation leading to a slight decrease of reflectivity in the near infrared range. After 3 × 1017 cm−2 of helium irradiation, reflectivity decreased by up to 20%. Combined irradiation by helium and molybdenum led to similar effects on reflectivity as irradiation with helium alone. Ion beam analysis showed that only 7% of the implanted helium was retained in the first 40 nm layer of the mirror. The structure of the near-surface layer after irradiation was studied with scanning transmission electron microscopy and the extent and size distribution of helium bubbles was documented. The consequences of ion-induced damage on the performance of diagnostic components are discussed.
|Journal series||Nuclear Instruments & Methods in Physics Research. Section B: Beam Interactions With Materials and Atoms, ISSN 0168-583X|
|Publication size in sheets||0.5|
|Keywords in English||Diagnostic mirrors, Fusion, Ion-induced damage, Helium, Molybdenum|
|Score|| = 25.0, 10-06-2020, ArticleFromJournal|
= 25.0, 10-06-2020, ArticleFromJournal
|Publication indicators||= 10; = 10; : 2016 = 0.906; : 2016 = 1.109 (2) - 2016=1.113 (5)|
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