Response of a Li-glass/multi-anode photomultiplier detector to collimated thermal-neutron beams

Abstract

The response of a position-sensitive Li-glass scintillator detector being developed for thermal-neutron detection with 6 mm position resolution has been investigated using collimated beams of thermal neutrons. The detector was moved perpendicularly through the neutron beams in 0.5 to 1.0 mm horizontal and vertical steps. Scintillation was detected in an 8 × 8 pixel multi-anode photomultiplier tube on an event-by-event basis. In general, several pixels registered large signals at each neutron-beam location. The number of pixels registering signal above a set threshold was investigated, with the maximization of the single-hit e ciency over the largest possible area of the detector as the primary goal. At a threshold of ∼50% of the mean of the full-deposition peak, ∼80% of the events were registered in a single pixel, resulting in an e ective position resolution of ∼5 mm in X and Y.Lower thresholds generally resulted in events demonstrating higher pixel multiplicities,

Technical Specification of the Small-Angle Neutron Scattering Instrument SKADI at the European Spallation Source

“…The detector used for SKADI will be a SoNDe-type pixelated scintillation detector [7,[18][19][20]. Apart from the high-flux capability necessary [21], especially in the area of the primary beam, this detector also provides an excellent scalability and geometric freedom arranges the available active surface area as needed.…”

“…While doing this, the pertinent parameters, such as the m-values of the guides, as well as the length and position of components, were varied in order to make sure the configuration was in a stable performance maximum. The SoNDe detector was finally developed specifically for use in a SANS instrument [7,[18][19][20].…”