[show abstract]
[hide abstract]
ABSTRACT: A new two-dimensional position sensitive detector system for small
angle neutron scattering experiments is under development. It is based
on a 60×60 cm<sup>2</sup> large <sup>6</sup>Li-glass scintillator
for the neutron capture and a 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
ADCs for each photomultiplier combined with FPCAs for a parallel event
detection in all channels have been applied. A subsequent farm of up to
16 floating point DSPs is to provide enough computing power for an
improved reconstruction of the event position according to a maximum
likelihood method
Nuclear Science Symposium Conference Record, 2000 IEEE; 02/2000
