High Voltage Power Supply System For Particle Detector

The Daya Bay reactor neutrino experiment is a high-energy physics research plan that uses the unique natural conditions of the Daya Bay nuclear power plant group to measure neutrino oscillations with high precision.The spallation neutron source is a large scientific device that produces high neutrons by the high-energy protons provided by the accelerator to produce neutrons.In neutrino experiments and large scientific devices,a large number of particle detectors and corresponding DC high voltage power supplies are required,and the high voltage power sources are distributed over a wide area.The research of this subject is mainly applied to large scientific equipment applications such as Daya Bay Neutrino Experiment,China Spallation Neutron Source Engineering,and also applicable to high voltage power systems of electronic equipment in other engineering projects.In this paper,the demand of high voltage DC power supply is analyzed,and combined with embedded technology,a particle detector high voltage power supply system is designed.The particle detector high-voltage power system is mainly composed of embedded hardware platform,operating system and application software of corresponding functions.According to the demand of DC detector for particle detector,the overall implementation scheme of particle detector high voltage power supply system is designed.The embedded hardware platform adopts ARM9 series microprocessor S3C2440 as the main controller,STM32 as the voltage module controller,plus network interface circuit,serial port circuit,power module circuit,voltage acquisition circuit,voltage control circuit,RS-485 bus interface circuit,The controller peripheral circuit and the like are constituted.Because the embedded Linux operating system has the advantages of cutting resources according to requirements,rich external driving resources,all source code for developers open source and rich online materials,this topic chooses to run the embedded Linux operating system.This paper introduces the construction of the embedded development environment in detail,realizes the transplantation of uboot boot startup program,the transplantation of Linux kernel and the selection of boot mode and the construction and mounting of root file system.Then based on this software and hardware advantages,the application of the particle detector high voltage power system was developed.The main controller is mainly responsible for transmitting data packets,reading data packets through select polling,and performing data processing.The main controller and the voltage module transmit data through the RS-485 bus communication network,and the RS-485 bus communication protocol is designed in the application program.Complete the design of voltage monitoring application software such as DC high voltage acquisition and control.After the hardware circuit design and software design of the particle detector highvoltage power supply system,the hardware circuit of the system is tested repeatedly and observed for a long time,then the embedded Linux system is tested,and finally the system controls the high-voltage output and acquisition.The DC high voltage value was tested and it was found through testing that the expected design requirements were met.The characteristics and innovation breakthrough of this topic is to realize the miniaturization and networking of the system.The system uses 32-bit ARM processor S3C2440 as the controller,STM32 as a multi-protocol communication interface conversion platform and control platform,running open source embedded operating system Linux,with open,miniaturized,friendly human-machine interface,cost-effective and so on.In large scientific engineering,remote real-time monitoring of tens of thousands of high-voltage sources can be provided through the network to provide real-time and reliable information for experimental devices,which can reduce the complexity of large-scale control systems.