Development Of Prototype Readout Electronics For High Count Rate TPC Detector Based On Self-Developed ASIC

With the construction of the High Intensity Heavy-ion Accelerator Facility(HIAF),a new generation of high intensity radiation ion beam line will be built in the future,which will provide important tools for the study of frontier scientific problems in nuclear physics.The GEM-TPC detector combines the Time Projection Chamber(TPC)and the Gas Electron Multiplier(GEM),which are two key concepts of modern gas detectors.It can measure the three-dimensional track and energy loss of charged particles with high precision and high efficiency,also it can provide effective technical support for future beam diagnosis and experimental study of nuclear material properties in medium energy region.At the same time,the GEM-TPC presents significant challenges to readout electronics systems in terms of count rate,integration,power consumption,and other key metrics.Traditional readout electronics cannot meet these requirements,so the solutions based on Application Specific Integrated Circuit(ASIC)technology have emerged.In this paper,we carried out the research of the prototype high counting rate,multichannel and low power consumption readout electronics system,which is based on an ASIC chip independently developed by our research group for high counting rate TPC detector readout requirements of HIAF beam lines in the future,and combine with Field Programmable Gate Array(FPGA)chip.Firstly,the performance index of ADC chip,which is the key module of ASIC chip,is evaluated according to IEEE standard.Secondly,we completed the circuit schematic design of the prototype readout electronics,the PCB board design,and the development of the FPGA firmware code.Finally,A prototype electronics system with 32 channels is implemented,which can realize charge sensitive amplification,filter forming,ADC conversion and data readout.Laboratory tests show that the single channel power consumption of the prototype electronics system is less than 30 m W.The case rate reached 20 KHz.Root mean square(RMS)of channel baseline noise is less than 1.28 f C.The channel energy resolution is better than0.8% and the time resolution is better than 2.5ns(at 500 f C input).The channel integration nonlinearity is better than 0.6% over the 10 f C to 550 f C range.Finally,the development of this prototype readout electronics system provides effective support for readout technology for high density and high counting rate TPC detectors on the HIAF beamlines.