Improved methodologies to study the performance of the ANET Compact Neutron Collimator

Abstract

The ANET project aims at developing 2D compact neutron collimators for neutron imaging applications. The results of the ANET collimator performances, presented in this communication, are based on data collected at the FISH beamline at TU-Delft. Two independent methods to evaluate the neutron radiography resolution are described and discussed, as well as a comparison of the beam divergence with or without the ANET collimator.

Study and perspective on neutron beam divergence improvement achievable by the combination of two or more neutron collimating systems

“…The measurements taken with both Siemens Star and gadolinium knife-edge reference samples have been analysed following the procedure in [2], and the results are shown in figure 2 The expected beam divergence should not be affected by a collimator whose collimation power is smaller than the beam divergence itself. The measurements shown in figure 2 point at different conclusions.…”

“…The study, here reported, derives its motivation from measurements performed at the TU-Delft FISH beam-line [1], where an unexpected improvement on the quality of the beam collimation [2], beyond what a simple geometrical model could predict, have been shown. This indicates that more complicated effects arise when combining two collimation systems.…”

“…Design of the experimental set-up present at the campaign. [2,4]. It made use of three towers -labeled as T4, T5 and T6 -.…”

“…Table 1 describes Table 1. Distance from the primary pin-hole to each motor (in mm) at each macro-position (1)(2)(3)(4) for the measurements at BOA. respect to the primary pin-hole.…”