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https://elib.bsu.by/handle/123456789/20332
Заглавие документа: | Short focal-length compound refractive lenses for x-rays |
Авторы: | Dudchik, Yury I. Kolchevsky, Nicolai N. Komarov, Fadei F. Piestrup, Melvin A. Cremer, J. Theodore Gary, Charles K. Pantell, Richard H. |
Тема: | ЭБ БГУ::ЕСТЕСТВЕННЫЕ И ТОЧНЫЕ НАУКИ::Физика |
Дата публикации: | 2004 |
Библиографическое описание источника: | Fourth Generation X-Ray Sources and Ultrafast X-Ray Detectors. - 2004. - 5194. - 56-61. |
Аннотация: | We have fabricated and tested short focal-length compound refractive lenses (CRLs) composed of micro-bubbles embedded in epoxy. The bubbles were formed in epoxy inside glass capillaries. The interface between the bubbles formed 90 to 196 spherical bi-concave microlenses reducing the overall focal length inversely by the number of lenses. When compared with CRLs manufactured using other methods, the micro-bubble lenses have shorter focal lengths with higher transmissions and gains for moderate energy x-rays (e.g. 7 – 12 keV). We used beamline 2-3 at the Stanford Synchrotron Radiation Laboratory (SSRL) to measure focal lengths between 100-150 mm and absorption apertures between 90 to 120 µm. Transmission profiles were measured giving, for example, a peak transmission of 27 % for a 126-mm focal length CRL at 8 keV. The focal-spot sizes were also measured yielding, for example, an elliptical spot of 5 x 14-µm2 resulting from an approximate 80-fold demagnification of the 0.44 x 1.7 mm2 source. The measured gains in intensity over that of unfocused beam were between 9 and 26. Theoretical gain calculations that include spherical aberrations show that these values are reasonable. The micro-bubble technique opens a new opportunity for designing lenses in the 8-9 keV range with focal lengths less than 30-40 mm. |
URI документа: | http://elib.bsu.by/handle/123456789/20332 |
Располагается в коллекциях: | Статьи сотрудников НИИ ПФП |
Полный текст документа:
Файл | Описание | Размер | Формат | |
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без выходных данныхDudchik_SPIE_5194_56_XCRL_2003.pdf | 355,29 kB | Adobe PDF | Открыть |
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