The Research On The Data Acquisition And Processing System Of The Large Scientific Facilities

With more and more widespread and profound application of nuclear science in scientific,military,industrial and consumer areas,construction of large scientific facilities for nuclear science and technology is gradually increasing.For ensuring stability and reliability of these facilities,a supporting platform is required to offer services for operation monitoring,feedback control,signal acquisition,and data analysis,etc.The Dragon-I linear induction accelerator(LIA)is an equipment for accelerating charged particles by utilizing the induced electromotive force produced by magnetic flux change,which has been widely applied in research and industrial areas such as radiography,free electron lasers,high-power microwaves,and heavy ion fusion,etc.In LIAs developing,debugging and operating stages,monitoring their working conditions of kinds of measurements is essential.In addition,a Tokamak fusion reactor named International Thermonuclear Experimental Reactor(ITER),was built and aimed at controlled fusion,whereby the neutron flux and neutron spectrum could evaluate the reactor performance.In consequence,an appropriate data acquiring and processing system for monitoring these parameters is also demanded.In this paper,it analyzes the technical requirements of the two large scientific facilities mentioned above,proposes and implements a corresponding solution for them.The system testing shows that the electronic performance as well as data processing capacity has achieved the expectations,and it is partially applied to operation.Beam current monitoring is a key component in LIA monitoring.Therefore,this paper focuses on beam signal acquiring,beam position detecting and the relevant data processing,on the basis of theoretical analysis and actual situation.In chapter one,the physical background,principle and evolution of Dragon-I LIA and ITER,are introduced.Combined with technical requirements of these two facilities,it makes a discussion of universal problems and critical points in data acquiring.By analyzing and solving the key issues existed,we establishes the main research direction and contents of this article.In chapter two,it is mainly expounded the solutions and research situations in large scientific facilities,as well as implementation in engineering filed.Chapter three presents an overall scheme of hardware design as well as its functional requirements and main point,according to theoretical analysis and actual demand of every measurement in large scientific facilities.The fourth chapter focuses on FPGA development process and algorithm design in detail,which comprises the hardware interface implementation,BPM concepts and manners.Chapter five introduces system test,including various electronic performance,and three kinds of data processing function test.All these results show that the system achieves the expected indexes well.In chapter six,it summarizes and analyzes the tested performance,and proposes an expectation in future development of this design.The objective of this research is to establish a data acquisition and processing system applied for large scientific facilities,which achieves unified management if data acquisition and waveform monitoring to satisfy corresponding engineering areas,and realizes customized analysis and processing according to specific items.This system provides multi-channel data accurate synchronization,digital waveform discrimination with online reconfigurable barrier-free system migration,which enhances versatility effectively and reduces complexity and cost.This article raises a detailed introduction on hardware implementation and data processing unit,in addition,the corresponding functions fit for LIA monitoring and ITER NFM,are also verified through experiments.