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A multi-channel readout electronics system for GEM and
MICROMEGAS has been developed. It consists of a front-end ASIC, a
multi-channel ADC and a FPGA to sample the signal waveforms in real
time. The gain of the front-end ASIC can be programmable from
1 mV/fC to 19 mV/fC and the output pulse width can be adjusted
from 200 ns to 800 ns. The ENC is me...
Context in source publication
Context 1
... the whole signal waveforms are sent to computers through a Giga-bit Ethernet. The event rate is limited by the speed of writing into the hard disk. It can be greatly improved by implementing DSP algorithm in the FPGA and developing online processing program for spe- cific applications. The readout electronics system is tested with MICROMEGS detector irradiated by a Fe-55 source. Recorded signal waveforms are show in figure 4. Some saturated signals are also observed, which are more likely from the spark discharging. The energy spectrum of Fe-55 is measured. The energy resolution for 5.9 keV peak is 40%, as shown in the left panel in figure 5. The spectrum is also measured with a conventional modular electronics system. It consists of a preamplifier (ORTEC-142), a main amplifier (ORTEC-571) and a peak sensing ADC (Philips 7164). The energy resolution is almost the same, as shown in the right panel in figure 5. It is limited by the detector performance itself and is probably due to the incompleteness of the charge ...
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Citations
... Since the pulses are narrow, a care must be taken while designing electronics for both analog and digital sections of readout structure. Amplification and width of pulses must be modified in order to match performance of analog-to-digital converters [12]. The overall analog and digital parameters of the system translate directly into the quality of measurements, i.e. energy spectrum of materials. ...
... This implementation can process pulses with width of 200 -800 ns. This system, compared with conventional modular solution, provides similar energy resolution [12]. ...
Data Acquisition Methods for GEM Detectors, Proc.SPIE 9290;
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