Characterization of a ballistic supermirror neutron guide

Details Characterization of a ballistic supermirror neutron guide Characterization of a ballistic supermirror neutron guide

2005-10-26

arxiv.org/abs/nucl-ex/0510072v1

Nucl.Instrum.Meth. A562 (2006) 407-417

Physics

Nuclear Physics

Nuclear Experiment

15 pages, 11 figures, to be submitted to Nuclear Instruments and Methods A

Scientific paper

10.1016/j.nima.2006.03.020

We describe the beam characteristics of the first ballistic supermirror neutron guide H113 that feeds the neutron user facility for particle physics PF1B of the Institute Laue-Langevin, Grenoble (ILL). At present, the neutron capture flux density of H113 at its 20x6cm2 exit window is 1.35x10^10/cm^2/s, and will soon be raised to above 2x10^10/cm^2/s. Beam divergence is no larger than beam divergence from a conventional Ni coated guide. A model is developed that permits rapid calculation of beam profiles and absolute event rates from such a beam. We propose a procedure that permits inter-comparability of the main features of beams emitted from ballistic or conventional neutron guides.

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