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Micromegas detector is a gas detector with parallel plate structure, and itconsists of a conversion gap in which radiations liberate ionization electronsand a thin amplification gap. The signal of the micromegas detector consists oftwo parts: the electron peak and the ion tail. The electronic signal just keepsfew nanoseconds, which is used for precise time measurement. The ion signalcarries most of the signal energy, and it is used to reconstruct particleenergy. The micromegas detector has the advantages of high counting rate, highgain, good time resolution and position resolution, excellentradiation-hardened performance, large sensitive area and readout convenience.This paper introduces a signals readout electronics system for micromegasdetector based on VMM chips. The VMM is the front end ASIC to be used in thefront end electronics readout system of both the micromegas and sTGC detectorsof the New Small Wheels Upgrade project. The VMM is designed by BrookhavenNational Laboratory, and each chip is composed of 64 linear front-end channels.Each channel integrates a low-noise charge amplifier (CA) with adaptivefeedback, test capacitor, and adjustable polarity (to process either positiveor negative charge). Based on those characteristics, the VMM is applicable forthe signals readout system of multichannel detectors. The readout systemconsists of three parts: the front-end board, the data acquisition board, andthe host computer with the control software.

A High Precision Signals Readout System for Micromegas Detector Based on the VMM