Performances of the front-end electronics for the HADES RPC TOF wall on a C-12 beam
2009
4 pages
Published in:
- Nucl.Instrum.Meth.A 602 (2009) 788-791
Contribution to:
Experiments:
Citations per year
Abstract: (Elsevier)
A Front-End Electronics (FEE) chain for timing accurate measurements has been developed for the RPC wall upgrade of the High-Acceptance DiElectron Spectrometer (HADES). The wall will cover an area of around 8m^2 with 1122 RPC cells (2244 electroni c channels). The FEE chain consists of two boards: a four-channel DaughterBOard (DBO) and a 32-channel MotherBOard (MBO). The DBO uses a fast 2GHz amplifier feeding a discriminator. The time and the charge information are encoded in the leading and the tr ailing edge (by a charge to width method) of an LVDS signal. Each MBO houses up to eight DBOs providing them regulated voltage supply, threshold values via DACs, test signals and collection of their trigger outputs. The MBO delivers LVDS signals to a time -to-digital converter readout board (TRB) based on HPTDC for data acquisition. In this work, we present the performance of the FEE measured using: (a) narrow electronic test pulses and (b) real signals read out in a fully instrumented RPC sextant installe d in its final position at the HADES. The detector was exposed to particles coming from reactions of a ^1^2C beam on Be and Nb targets at 2GeV/A kinetic energy. Results for the whole electronic chain (DBO+MBO+TRB) show a timing jitter of around 40ps/chann el for pulses above 100fC and 80ps/channel for beam data taken with the RPC.- HADES
- RPC
- Front-end electronics
- Performances
- Readout system
- Time resolution
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