Measuring the near-target neutron field of a D–D fusion facility with the novel NCT-WES spectrometer

A new directional neutron spectrometer called NCT-WES (Neutron Capture Therapy Wide Energy Spectrometer) was
recently developed within the INFN ENTER_BNCT project. This device constitutes a more compact and portable alternative to stateof-
the-art directional neutron spectrometers. The device was used for the first time to characterise the near-target field produced by
an accelerator-driven D–D fusion neutron source. NCT-WES operates as a “parallelised” Bonner spheres spectrometer, embedding
six semiconductor-based thermal neutron detectors in a cylindrical moderator. Owing on a cylindrical collimating aperture, the
device exhibits sharply directional response. To account for the non-uniform irradiation condition experienced in the near-target
field, a dedicated NCT-WES response matrix was developed. The neutron spectrum at 0◦ from the D–D neutron target, determined
by means of the FRUIT unfolding code, is coherent with that previously derived with Bonner spheres. NCT-WES proved to be a
promising device for angular spectrometric characterisation of neutron-emitting targets.