Simulation of waviness in neutron guides

Article type: Research Article

Authors: Hansen, Ursula Bengaard^{a; *} | Bertelsen, Mads^a | Knudsen, Erik Bergbäck^b | Lefmann, Kim^a

Affiliations: [a] Niels Bohr Institute, University of Copenhagen, Universitetsparken 5, Denmark | [b] Department of Physics, Technical University of Denmark, Lyngby, Denmark

Correspondence: [*] Corresponding author. E-mail: [email protected].

Abstract: As the trend of neutron guide designs points towards longer and more complex guides, imperfections such as waviness becomes increasingly important. Simulations of guide waviness has so far been limited by a lack of reasonable waviness models. We here present a stochastic description of waviness and its implementation in the McStas simulation package. The effect of this new implementation is compared to the guide simulations without waviness and the simple, yet unphysical, waviness model implemented in McStas 1.12c and 2.0.

Keywords: Waviness, neutron guides, super mirror, Monte Carlo simulations

DOI: 10.3233/JNR-150023

Journal: Journal of Neutron Research, vol. 18, no. 2-3, pp. 45-59, 2015