کد مقاله کد نشریه سال انتشار مقاله انگلیسی نسخه تمام متن
9844933 1526503 2005 12 صفحه PDF دانلود رایگان
عنوان انگلیسی مقاله ISI
Using phase-space transformation for an improved hybrid cold time-of-flight spectrometer
کلمات کلیدی
موضوعات مرتبط
مهندسی و علوم پایه فیزیک و نجوم ابزار دقیق
پیش نمایش صفحه اول مقاله
Using phase-space transformation for an improved hybrid cold time-of-flight spectrometer
چکیده انگلیسی
The concept and layout of a time-of-flight spectrometer for cold neutrons is presented which makes use of the principle of phase-space transformation. Close to the focal plane determined by a first-curved monochromator a second moving crystal is placed. If moving with the right velocity this crystal monochromatizes the neutron beam and reduces at the same time its horizontal divergence. With pyrolithic graphite as monochromator focusing can be realized for 5Å⩽λ⩽6.5Å. At λ=6Å an energy resolution δE∼60μeV is calculated. Compared to time-focusing instruments improved momentum transfer resolution and good energy resolution at all energy transfers is obtained. A reduction of intensity by the second monochromator will be most likely balanced by improved background. The wavelength dependence of the energy focusing velocity restricts in practice the instrument to one or two fixed wavelengths. The instrument does not need an end position on a neutron guide.
ناشر
Database: Elsevier - ScienceDirect (ساینس دایرکت)
Journal: Nuclear Instruments and Methods in Physics Research Section A: Accelerators, Spectrometers, Detectors and Associated Equipment - Volume 554, Issues 1–3, 1 December 2005, Pages 415-426
نویسندگان
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