Design And Implementation Of Readout Electronics System For MWPC Detector

China Spallation Neutron Source(CSNS) is a key construction of large scientific facilities during our “Eleventh Five-Year Plan”. By means of using high energy protons bombard the heavy metal target to produce neutrons, CSNS effectively improve the upper limit of traditional neutron flux and provides an advanced and function formidable research platform for the frontier research in basic science in China. In the early stage, there are three spectrometers will be built. They are High Intensity Powder Diffractometer(GPPD), Small Angle Diffractometer(SANS) and Multipurpose Reflectometer(REFL). Two-dimensional Multi-Wire Proportional Chamber(MWPC) detector is used in SANS and REFL. This paper focuses on the scheme, implementation and test results of the Electronics Readout System of MWPC detector.This design is comprised of an electronics readout board, a firmware for FPGA and an application in PC. A field programmable gate array(FPGA) is used as controller and data processor on the board, it allows the readout board can handle multiple channels simultaneously. Use multi-channels application specific integrated circuit(ASIC) produced by IDEAS, we can acquisition and processing the position signal generated by the MWPC detector. Compared with the traditional hardware structure which is set up by discrete devices and amplifiers, this design has more advantages: low power consumption, small space occupation, high signal noise ratio and less hardware cost. Since the development of FPGA firmware is simple and easy to upgrade, the function of the readout board has very high flexibility without changing the hardware. The application in PC is designed by calling C programs under NI graphical programming environment : Lab VIEW2012. It has the characteristics of friendly interface, convenient operation and so on. According to the demands, the application can configure the work mode, read back the data packets, analysis the data in real time and display the results visually.Generally, particle detector works in a strong electromagnetic interference environment. Long distance transmission in this environment will inevitably cause serious interferences. This design uses ASIC and FPGA to fulfill the readout tasks of MWPC detector, greatly improv e the integration and reduce the volume of the readout card, make it easy to mount to the detectors. So, the signals are processed into digital signals, easy to transfer to PC or data collection card s. In addition, this design using digital method to readout the position information. Setting a appropriate threshold can effective improve the counting rate. In conclusion, as a readout electronics research for MWPC detector used in CSNS REFL spectrum, this design has a high theoretical and practical significance, the final test results give out a useful guide for the future engineering application.