Focusing cold neutrons with multiple biconcave lenses for small-angle neutron scattering
- 1 June 2000
- journal article
- research article
- Published by International Union of Crystallography (IUCr) in Journal of Applied Crystallography
- Vol. 33 (3) , 793-796
- https://doi.org/10.1107/s0021889800099799
Abstract
The focusing of a cold neutron beam by multiple biconcave lenses has recently been proposed as a practical means of extending the lower limit of Q in conventional, long flight-path small-angle neutron scattering (SANS) instruments. To test the feasibility of this approach, we have carried out extensive measurements on one of the 30 m SANS instruments at NIST of the focusing characteristics of a set of 28 biconcave MgF2 lenses. The focused beam profile has been measured over several orders of magnitude using high resolution neutron auto-radiography. The focusing lens configuration outperforms the pinhole collimation at Q min lower than 0.004 Å−1. At Q min = 0.001 Å−1, the intensity gain of the lens configuration over the pinhole collimation is greater than one order of magnitude.Keywords
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