Effect of vacancy defect clusters on the optical property of the aluminium filter used for the space solar telescope

doi:10.1088/1674-1056/19/1/016103

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 × 10¹¹/mm². 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.

Keywords: proton irradiation vacancy defect clusters aluminium filter optical performance

Received: 14 April 2009
Revised: 11 May 2009
Accepted manuscript online:

PACS:	61.72.J-	(Point defects and defect clusters)
	42.79.Ci	(Filters, zone plates, and polarizers)
	61.72.Qq	(Microscopic defects (voids, inclusions, etc.))
	61.80.Jh	(Ion radiation effects)
	95.55.Ev	(Solar instruments)

Fund: Project supported by the National Natural Science Foundation of China (Grant No. 50671042), the Program for Innovative Research Team of Jangsu University and the Program for Exellent Talents of Jangsu University (Grant No. 07JDG032).

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Cheng Xiu-Wei(程秀围), Guan Qing-Feng(关庆丰), Fan Xian-Hong(范鲜红), and Chen Bo(陈波) Effect of vacancy defect clusters on the optical property of the aluminium filter used for the space solar telescope 2010 Chin. Phys. B 19 016103

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Effect of vacancy defect clusters on the optical property of the aluminium filter used for the space solar telescope

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