Effect of vacancy defect clusters on the optical property of the aluminium filter used for the space solar telescope |
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Authors: | Cheng Xiu-Wei Guan Qing-Feng Fan Xian-Hong and Chen Bo |
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Institution: | College of Material Science and Engineering, Jiangsu University, Zhenjiang 212013, China; State Key Laboratory of Applied Optics, Changchun Institute of Optics, Fine Mechanics and Physics, Chinese Academy of Sciences, Changchun 130033, China |
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Abstract: | We investigate the microstructures of the pure aluminium foil
and filter used on the space solar telescope, irradiated by photons
with different doses. The vacancy defect clusters induced by proton
irradiation in both samples are characterized by transmission
electron microscopy, and the density and the size distribution of
vacancy defect clusters are determined. Their transmittances are
measured before and after irradiating the samples by protons
with energy $E=100$~keV and dose $\phi =6\times 10^{11}$/mm$^{2}$.
Our experimental results show that the density and the size of
vacancy defect clusters increase with the increase of irradiation
doses in the irradiated pure aluminium foils. As irradiation dose
increases, vacancies incline to form larger defect clusters. In the
irradiated filter, a large number of banded void defects are
observed at the agglomerate boundary, which results in the
degradation of the optical and mechanical performances of the
filter after proton irradiation. |
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Keywords: | proton irradiation vacancy defect clusters aluminium
filter optical performance |
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