Abstract
Abstract
This study introduces a readout system for 3He linear
position-sensitive detectors (LPSDs), tailored for the Small Angle
Neutron Scattering (SANS) spectrometer of the Compact Pulsed Hadron
Source (CPHS) at Tsinghua University. Central to this system is the
employment of a trapezoidal filter as the primary signal shaper,
selected for its enhanced noise filtering capabilities and efficacy
in mitigating ballistic deficit. Additionally, the integration of a
digital CR filter aims to counteract baseline drift within trigger
signals. This innovative architecture underwent validation via
computer programs using experimental data, demonstrating superior
performance in spatial resolution compared to conventional Gaussian
filter-based approaches. Meanwhile, the improvement in spatial
resolution comes with a narrower pulse width, promising a higher
throughput at high count rates. When applied to a 16-tube detector
module, the system achieved an average position resolution of
3.63 mm (FWHM) at the central region and 4.03 mm at the end
regions. Furthermore, with a pusle width of 0.6 μs, the
96-tube detector array is promised to sustain a count rate over
1 Mcps.