The Front-End Electronics of the HADES timing RPCs wall. Daniel Belver Fernández LabCAF-University of Santiago de Compostela
The HADES tRPC TOF wall.
The Front-End Electronics (FEE) developed for the RPCs.
Calibration of the ‘Charge to Width’ algorithm.
In beam results.
Summary of the main FEE performances.
Adaptation of the FEE to TRASGO detector.
HADES tRPC TOF wall
The RPC Front-End Electronics (FEE) t 1 t 2 FEE-DBOs (108 DBOs/sector x6) FEE-MBOs (16 MBOs/sector x6) Mechanical support board, providing power supply, test signal and threshold DAQs. Amplifying and timing discrimination board (QtoW algorithm).
FEE and DAQ system 4 MBOs/TRB 8 DBOs/MBO 4 cells/DBO 4 TRB/sector 2 LV/sector See M. Traxler talk Trigger ∑ Front-End MBO DBO RPC signals RPC signals RPC cells DC-DC converter Commercial power supply Low voltage system 5 3.3 -5 5V,-5V,3.3V 48V Ethernet TRB Data acquisition system
4-channel & 6-layer board connected to 4 RPC cells.
1 amplifier (G=35.5 dB, BW=2 GHz, NF=4.5 dB) .
Generates timing and trigger signals.
Time & charge encoded in a single LVDS digital output (low power consumption and high noise immunity).
- Leading edge Arrival time (ToF measure).
- Pulse width Charge (QtoW algorithm).
DaughterBOard (DBO) All SMT available components (R & C 0402 size) SAMTEC connector (40 pins, 0.8 mm pitch) Area=5x4.5 cm 2 1 3 2 4 Width ~charge (QtoW) Arrival time LVDS
TI OPA690 amp integrates the amplified signal (QtoW algorithm) PHILIPS BGM1013 amp (35.5 dB at 1 GHz) Protected by PHILIPS BAV199 2-diodes RPC cell One DBO channel: analog stage Analog stage Digital stage Amplified RPC signal Integrated signal
MAX9601 dual PECL discriminator: LE used for cut/shape the output pulse TI SN65LVDS100 PECL-LVDS converter PHILIPS BFT92 PNP wideband (5 GHz) transistor for multiplicity trigger sum One DBO channel: digital stage Analog stage Digital stage Discriminator output Latch Enable (LE) Latch Enable/ (LE/)
Interfaces board between DBO and DAQ system (TRB).
8-layer board providing mechanical support to 32 channels (8 DBOs) or 12 channels (3 DBOs).
Area 40x6 cm 2 Area 16.5x6.5 cm 2
Delivers the timing signals from 8 DBOs to the TRB.