The optimization of the ballistic guide design for the SNS Fundamental Neutron Physics Beamline 8.9 A line is described. With a careful tuning of the shape of the curve for the tapered section and the width of the straight section, this optimization resulted in more than 75% increase in the neutron flux exiting the 33 m long guide over a straight m=3.5 guide with the same length.
@article{arxiv.physics/0604198,
title = {Optimization of the Ballistic Guide Design for the SNS FNPB 8.9 A Neutron Line},
author = {Takeyasu M. Ito and Christopher B. Crawford and Geoffrey L. Greene},
journal= {arXiv preprint arXiv:physics/0604198},
year = {2009}
}
Comments
21 pages, 13 figures; added a paragraph on existing ballistic guides to respond to referee comments; accepted for publication in Nuclear Inst. and Methods in Physics Research, A