Usb-based Tgc Detectors Signal Channel Detection System

Large Hadronic Collider(LHC) , locate at CERN(European Organization for Nuclear Research), will be the highest energy proton-proton collider in the world with 14-TeV center of mass by now. ATLAS (A Toroidal LHC Apparatus) is a huge general-purpose particle detector which will be installed on one colliding point of LHC, TGC(Thin Gas Chamber)detector is one member of Muon trigger system on ATLAS. TGC detector is a multi-wire chamber characterized by its rapid response time and high granularity, its response time' is less than 25ns.Shandong University is in charge of the production of 400 TGC chambers for ATLAS, parts of 3968 ATLAS TGC chambers in total. There are 64 signal channels for every TGC chamber. Every signal channel of all detector must be checked in the assembly process to keep perfect TGC quality, total 400*64=25600 signal channels.One handy USB(Universal Serial Bus) system has been developed to check the signal channels of TGC detectors according to the fabric of TGC., This system transfer the data from DAQ system to the host computer by USB interface, because USB system is fast and easy to operate. Each time, all the 64 signal channels of one TGC chamber were scanned automatically, the testing report are displayed on the screen of computer, the testing data are recorded on the computer disk in text format. This system is based on USB interface technology, and integrates traditional data acquisition technology into USB technology.In this thesis, the following parts were included: introduction the USB interface technology; The principle of the TGC signal channel testing system; The detail description of the design of hardware module (choicing signal channel, regulating analog signals USB interface)and software( firmware, USB equipment driver and user interface of computer)?Hardware module is on a PCB(Printed Circuit Board) ,it is a NIM .Firmware not only can control USB equipment ,but also transmits data to pc and interpret command from pc. USB equipment driver is a bridge between hardware and User Interface.For communicating with low nuclear mechanism under Windows ,It uses WDM(Windows Driver Model) and DDK(Driver Development Kit).The method of developing USB equipment under windows system is presented . This system is friendly, there are several different set can be used for different measurement. It can be set to: check only one signal channel of one TGC, scan all 64 signal channel one after another, scan only parts of all the channels. The testing results are agree with the TGC machinery, so it show that the system work stably and exactly.