Abstract
A new method has been developed to check the correct behaviour of the frontend electronics of the LHCb muon detector. This method is based on the measurement of the electronic noise rate at different thresholds of the front-end discriminator. The method was used to choose the optimal discriminator thresholds. A procedure based on this method was implemented in the detector control system and allowed the detection of a small percentage of front-end channels which had deteriorated. A Monte Carlo simulation has been performed to check the validity of the method.
Highlights
The front-end electronicsTo meet the required condition on rate capability and resolution, the MWPCs of the muon detector were partitioned in pads of different size and capacitance
To keep all the readout channels of the MWPCs of the LHCb muon detector under control
The quantity σV is related to the equivalent noise charge (ENC) which is defined as the δ -like charge sent to the front-end which delivers an output signal equal to σV
Summary
To meet the required condition on rate capability and resolution, the MWPCs of the muon detector were partitioned in pads of different size and capacitance. The readout was performed on the cathodes or/and on the anodes of the chambers. Each channel of the front-end electronics comprises an amplifier, a shaper and a discriminator. Each CARIOCA chip comprises 8 readout channels and two CARIOCAs were mounted on a front-end board which performs the readout of 16 chamber pads
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