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.
@article{arxiv.nucl-ex/0510072,
title = {Characterization of a ballistic supermirror neutron guide},
author = {H. Abele and D. Dubbers and H. Haese and M. Klein and A. Knoepfler and M. Kreuz and T. Lauer and B. Maerkisch and D. Mund and V. Nesvizhevsky and A. Petoukhov and C. Schmidt and M. Schumann and T. Soldner},
journal= {arXiv preprint arXiv:nucl-ex/0510072},
year = {2015}
}
Comments
15 pages, 11 figures, to be submitted to Nuclear Instruments and Methods A