Open AccessDamage threshold of platinum/carbon multilayers under hard X-ray free-electron laser irradiation
Author(s) -
Jang Woo Kim,
Ayaka Nagahira,
Takahisa Koyama,
Satoshi Matsuyama,
Yasuhisa Sano,
Makina Yabashi,
Haruhiko Ohashi,
Tetsuya Ishikawa,
Kazuto Yamauchi
Publication year - 2015
Publication title -
optics express
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 1.394
H-Index - 271
ISSN - 1094-4087
DOI - 10.1364/oe.23.029032
Subject(s) - irradiation , materials science , platinum , optics , laser , carbon fibers , x ray , electron , bragg peak , photon energy , electron beam processing , photon , beam (structure) , physics , chemistry , biochemistry , quantum mechanics , composite number , nuclear physics , composite material , catalysis
We evaluated the irradiation damage induced by hard X-ray free-electron lasers to platinum/carbon multilayers intended for use in a focusing reflective mirror. In order to determine the damage threshold, we compared X-ray reflectivities before and after irradiation at the first-order Bragg angle using a focused X-ray free-electron laser with a beam size of approximately 1 μm and a pulse energy ranging from 0.01 to 10 μJ at a photon energy of 10 keV. We confirmed that the damage threshold of the platinum/carbon multilayer with a bilayer period of 3 nm was 0.051 μJ/μm(2), which is sufficiently higher than that in practical applications.