کد مقاله | کد نشریه | سال انتشار | مقاله انگلیسی | نسخه تمام متن |
---|---|---|---|---|
1768854 | 1020242 | 2007 | 5 صفحه PDF | دانلود رایگان |
عنوان انگلیسی مقاله ISI
Diffractive-refractive X-ray optics for very high angular resolution X-ray astronomy
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کلمات کلیدی
موضوعات مرتبط
مهندسی و علوم پایه
علوم زمین و سیارات
علوم فضا و نجوم
پیش نمایش صفحه اول مقاله
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چکیده انگلیسی
The 0.5Â arcsec angular resolution of the Chandra X-ray Observatory is possibly the best that a grazing incidence telescope with substantial collecting area will ever attain. We describe a telescope consisting of a diffractive and refractive doublet that transmits rather than reflects X-rays. Therefore, its angular resolution is relatively insensitive to figure errors and surface roughness, the factors that limit grazing incidence telescopes. When the focal length of the refractive component is minus twice that of the diffractive the chromatic aberration that is inherent in the diffractive and refractive components individually will compensate each other within a limited but not insignificant energy band. We consider a system with a long focal length, about 5000Â km, to allow the refractive lens to be thin and transmit X-rays. The long focal length requires very long distance formation flying between an optics spacecraft and a detector spacecraft that must be aligned to better than a few centimeters. Solar orbit is a likely site. We simulate an imaging system where chromatic aberration is corrected to first order at 6Â keV. The angular resolution is expected to be better than 0.3Â miliarcsec within a 10% bandwidth. The components are lightweight, and can probably be made in a machine shop.
ناشر
Database: Elsevier - ScienceDirect (ساینس دایرکت)
Journal: Advances in Space Research - Volume 40, Issue 8, 2007, Pages 1276-1280
Journal: Advances in Space Research - Volume 40, Issue 8, 2007, Pages 1276-1280
نویسندگان
Paul Gorenstein,