The completely renewed and upgraded neutron reflectometer at the TU Delft Reactor Institute

Abstract

The horizontal time-of-flight neutron reflectometer at the reactor of the Delft University of Technology, The Netherlands, has been completely renewed, relocated, and upgraded and allows for the study of air/liquid, solid/liquid, and solid/air interfaces. Innovations in the redesign include (i) a completely flexible double disk chopper system allowing to choose the optimal wavelength resolution with exchangeable neutron guide sections between the chopper disks to increase intensity, (ii) a movable second diaphragm just before the sample position to better control the beam footprint on the sample and effectively decrease counting times, and (iii) guides along the entire flight path of the neutron reflectometer. The performance of the renewed reflectometer is illustrated with measurements of hydrogen sensing materials.

Structural and Optical Properties of Thin Film β-Ta upon Exposure to Hydrogen to Asses Its Applicability as Hydrogen Sensing Material

“…The in situ neutron reflectometry measurements were performed at the time-of-flight neutron reflectometer ROG, located at the 2.3 MW HOR reactor of the Delft University of Technology, Delft, The Netherlands. 38 For these measurements, the same settings as the measurements on α-Ta reported in ref 9 were used. These settings yield a footprint of 65/80 × 40 mm 2 (umbra/penumbra) and a resolution of ΔQ/Q ≈ 5%.…”