A cosmic ray readout system for qualifications of small-strip thin gap chambers of the ATLAS muon spectrometer Phase-I upgrade

摘要

The Atlas detector, which is one of the Large Hadron Collider (LHC) at CERN, will be upgraded in order to extend the frontiers of particle physics. Bunches of up to 1011 protons will collide at the rate of 40MHz to provide 14TeV proton-proton collisions at a designed luminosity of 1034cm-2s-1. Currently ATLAS is under Phase-I upgrade, which focus mainly on the Level-1 trigger system to maintain the full acceptance of muon tracking while discriminate against background and keep the Level-1 rate at an acceptable level. The New Small Wheel(NSW), which consists of 16 detector planes in two multi-layers comprising of four small-strip Thin Gap Chamber(sTGC) and four MicroMagas(MM) detector planes, is to replace the current muon Small Wheel in order to achieve the upgrade goals. The sTGC Level-1 pad trigger logic is implemented first single wedge pad trigger which is based on coincident hits in three out of four layers of a multiplet in each wedge independently and then pad trigger which is based on geometrical matching between the two wedge triggers in order to identify the interaction point (IP). We designed the pads Front End Board (pFEB) to gather and analyses pads trigger which is the most important issue for Atlas Phase-I upgrade.