Journal
NUCLEAR INSTRUMENTS & METHODS IN PHYSICS RESEARCH SECTION A-ACCELERATORS SPECTROMETERS DETECTORS AND ASSOCIATED EQUIPMENT
Volume 562, Issue 1, Pages 407-417Publisher
ELSEVIER
DOI: 10.1016/j.nima.2006.03.020
Keywords
cold neutrons; neutron guide; supermirror guide; ballistic guide
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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 20 x 6 cm(2) exit window is phi(C) = 1.35 x 10(10) cm(-2) s(-1), and will soon be raised to above 2 x 10(10) cm(-2) s(-1). 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. (c) 2006 Elsevier B.V. All rights reserved.
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