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ANSTO Publications Online >
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Please use this identifier to cite or link to this item:
http://apo.ansto.gov.au/dspace/handle/10238/3762
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| Title: | The ABC of powder diffractometer detector coverage |
| Authors: | Andersen, KH Bentley, PM Cussen, LD |
| Keywords: | Diffractometers Radiation Detectors Powers Neutron Spectrometers Cylindrical Configuration Scattering |
| Issue Date: | 1-Apr-2011 |
| Publisher: | Wiley-Blackwell |
| Citation: | Andersen, K.H., Bentley, P.M., Cussen, L.D. (2011). The ABC of powder diffractometer detector coverage. Journal of Applied Crystallography, 44(Part 2), 295-298. |
| Abstract: | This article addresses the question of the most effective detector configuration for neutron spectrometers using a discussion of a particular case - constant-wavelength powder diffractometers at continuous neutron sources. A first variation uses an essentially one-dimensional `banana' detector coupled with out-of-scattering-plane beam divergence before and after the sample. A second variation uses an incident beam tightly defined both in- and out-of-plane coupled to a `4 pi' detector covering all possible scattering angles after the sample. It is widely believed that the 4 pi arrangement is superior for most varieties of neutron spectrometer but is more difficult and more expensive to implement. Starting from a commonly used overall instrument figure-of-merit, this article presents simple arguments leading to the surprising conclusion that this is untrue for these constant-wavelength powder diffractometers, provided only that the cylindrical samples used with the banana detector have a height greater than 2.4 times their diameter. © 2011, Wiley-Blackwell. The definitive version is available at www3.interscience.wiley.com |
| URI: | http://dx.doi.org/10.1107/S0021889811005498 http://apo.ansto.gov.au/dspace/handle/10238/3762 |
| ISSN: | 0021-8898 |
| Appears in Collections: | Journal Articles |
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