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

Abstract

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 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.
Author A. Garcia-Carrasco
A. Garcia-Carrasco,,
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, P. Petersson
P. Petersson,,
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, A. Hallén
A. Hallén,,
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, J. Grzonka
J. Grzonka,,
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, M.R. Gilbert
M.R. Gilbert,,
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, Elżbieta Fortuna-Zaleśna (FMSE / DMD)
Elżbieta Fortuna-Zaleśna,,
- Division of Materials Design
, M. J. Rubel
M. J. Rubel,,
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Journal seriesNuclear Instruments & Methods in Physics Research. Section B: Beam Interactions With Materials and Atoms, ISSN 0168-583X, (A 25 pkt)
Issue year2016
Vol382
Pages91-95
Publication size in sheets0.5
Keywords in EnglishDiagnostic mirrors, Fusion, Ion-induced damage, Helium, Molybdenum
ASJC Classification3105 Instrumentation; 3106 Nuclear and High Energy Physics
DOIDOI:10.1016/j.nimb.2016.02.065
Languageen angielski
File
Impact of helium implantation and ion-induced damage on reflectivity.pdf 662.25 KB
Score (nominal)25
Score sourcejournalList
ScoreMinisterial score = 25.0, 31-12-2019, ArticleFromJournal
Ministerial score (2013-2016) = 25.0, 31-12-2019, ArticleFromJournal
Publication indicators WoS Citations = 10; Scopus SNIP (Source Normalised Impact per Paper): 2016 = 0.906; WoS Impact Factor: 2016 = 1.109 (2) - 2016=1.113 (5)
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