کد مقاله | کد نشریه | سال انتشار | مقاله انگلیسی | نسخه تمام متن |
---|---|---|---|---|
10715810 | 1027369 | 2011 | 9 صفحه PDF | دانلود رایگان |
عنوان انگلیسی مقاله ISI
Phase space optimisation of the USANS instrument Kookaburra at the ANSTO OPAL reactor
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کلمات کلیدی
موضوعات مرتبط
مهندسی و علوم پایه
فیزیک و نجوم
ابزار دقیق
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چکیده انگلیسی
An optimisation of the USANS instrument Kookaburra has been conducted determining the most efficient type of premonochromator crystal and scattering geometry. The approach has been based on representations in phase space combining direct and reciprocal space diagrams. Results are presented for several scenarios involving flat and curved, perfect and mosaic crystals, horizontal and vertical scattering planes. The highest peak current density of 1.7Ã105Â cmâ2Â sâ1 is provided for a wavelength of 4.43Â Ã
by a doubly curved pyrolytic graphite premonochromator diffracting in a horizontal plane and producing a beam size of about 50Â cm2 at the sample position. The smallest background is achieved for a wavelength of 2.56Â Ã
and a vertical scattering plane using a bent perfect premonochromator crystal and optionally a collimator to decrease the divergence of the beam exiting the cold neutron guide. For this wavelength a peak current density of 6.6Ã104Â cmâ2Â sâ1 is collected into a sample area of 10Â cm2. The bent perfect crystal design is of particular advantage for small samples.
ناشر
Database: Elsevier - ScienceDirect (ساینس دایرکت)
Journal: Nuclear Instruments and Methods in Physics Research Section A: Accelerators, Spectrometers, Detectors and Associated Equipment - Volume 634, Issue 1, Supplement, 1 April 2011, Pages S81-S89
Journal: Nuclear Instruments and Methods in Physics Research Section A: Accelerators, Spectrometers, Detectors and Associated Equipment - Volume 634, Issue 1, Supplement, 1 April 2011, Pages S81-S89
نویسندگان
A.K. Freund, C. Rehm,