Speaker
Description
At WCNR 12, we reported about creating a vertical neutron beam by 90 degree reflection of a horizontal neutron beam to the vertical for the examination of thin liquids.
In this presentation, we want to discuss more aspects of the use of pyrolytic graphite crystals as an effective secondary source. The mosaicity of the crystals destroys the initial collimation of the neutron beam and makes collimated imaging on short distances impossible if the sample is not very close to the detector. However, by increasing the distance between the crystal and the sample, the crystal size acts as effective ‘D’ in the collimation L/D, with the mosaicity adding only slightly to this unsharpness. Measurements at ATI and ILL will be dis-cussed as well as new ideas for the use of crystals, and additions to existing double crystal monochromators in imaging facilities.
| Abstract Topic | Development of experimental techniques and new principles |
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