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A new two-dimensional scintillation detector system for small-angle neutron scattering experiments

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10 Author(s)
G. Kemmerling ; Zentrallabor fur Elektronik, Forschungszentrum Julich GmbH, Germany ; R. Engels ; N. Bussmann ; U. Clemens
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A new two-dimensional position-sensitive detector system for small-angle neutron scattering experiments is under development. It is based on a 60×60 cm2 large 6Li-glass scintillator for the neutron capture and dispersion of the emitted light on an array of photomultiplier tubes for the derivation of the event position. For subthermal neutrons of 8 Å, an efficiency of 96% and a spatial resolution of 8 mm are to be achieved. Major improvements have been made in the signal- and data-processing branch, which aims at an electronic dead time of 1 μs. A fast digitalization method using free-running analog-to-digital converters for each photomultiplier combined with field-programmable gate arrays for a parallel event detection in all channels has been applied. A subsequent farm of up to 16 floating-point digital signal processors is used to provide enough computing power for an improved reconstruction of the event position according to a maximum likelihood method

Published in:

IEEE Transactions on Nuclear Science  (Volume:48 ,  Issue: 4 )