Impact of helium implantation and ion-induced damage on reflectivity of molybdenum mirrors
2016 (English)In: Nuclear Instruments and Methods in Physics Research Section B: Beam Interactions with Materials and Atoms, ISSN 0168-583X, E-ISSN 1872-9584Article in journal (Refereed) PublishedText
Molybdenum 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 40nm 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.
Place, publisher, year, edition, pages
Diagnostic mirrors, Fusion, Helium, Ion-induced damage, Molybdenum, Fusion reactions, High resolution transmission electron microscopy, Infrared devices, Ion beams, Ions, Irradiation, Mirrors, Radiation, Reflection, Scanning electron microscopy, Transmission electron microscopy, Helium implantation, Helium irradiation, Implanted helium, Ion beam analysis, Near-infrared range, Near-surface layers, Scanning transmission electron microscopy, Neutron irradiation
Accelerator Physics and Instrumentation Fusion, Plasma and Space Physics Atom and Molecular Physics and Optics
IdentifiersURN: urn:nbn:se:kth:diva-188336DOI: 10.1016/j.nimb.2016.02.065ISI: 000382413500018ScopusID: 2-s2.0-84960914771OAI: oai:DiVA.org:kth-188336DiVA: diva2:934785
QC 201606092016-06-092016-06-092016-09-23Bibliographically approved