Multi-Function Nuclear Data Acquisition And Processing System Based On Networking

Nuclear Data Acquisition and Processing System ( NDAAPS ) is an important tool in many fields of research, such as Nuclear Physics, High Energy Physics, Atom-molecule Physics and The Application of Nuclear Technology. In recent years, as the result of the rapid development of the research in those fields, the traditional mode of Nuclear Data Acquisition and Processing System consisted of CAMAC system plus middle and giant computers was no longer in full fit for the requirements of the new experiments and the new state of computer technology. Scientists are seeking some way to overcome those problems. Based on the single chip microcomputers, CPLDs (Complex Programmable Logic Device) and PC computers, we have taken a particular way to build up a multi-function nuclear data acquisition and processing system with the features of networknization. This system has been putting into operation satisfactorily.Our new system was consisted of many independent subsystems which was composed by a PC computer and intellectualized NIM modules. Every subsystem was built in real time mode to acquire, monitor and control a certain kinds of physical data and apparatus at different experimental places. Then, we successfully linked all the PC computers in every subsystem to form a special local area network (SLAN). Through this SLAN, it is easy to get and process large amount of different kinds of nuclear data with large numerical values in a large area and to transmit those digital messages quickly among the PCS, which promoted and made this system fit for the new requirements in the research of atom-molecule physics. This kind of nuclear data acquisition and processing system composed by intellectualized NIM modules, single chip microcomputers and PC computers is cost cheaply and reached the ability of data acquisition and processing which ever gained by the system consisted of CAMAC system andmiddle or giant computers. It provides the ordinary laboratories with a simple and economical way to build their own NDAAPS through exploiting the potential ability of NIM system and other existing equipment.In order to make the functions of our new NDAAPS as perfect as possible to meet the new requirements in the experiments of Atom-molecule Physics, we have done two more works. First, we chose the hardware of networking and developed our own programs to link into the SLAN the subsystems which were built by the MS students in the past few years and titled as, for example, "real time monitoring and control system for the accelerator beam bombarding point on target" and so on. Second, we studied and built up a new NMR subsystem for the measurement and control of the magnetic field of the magnetic analyzer of Van de Graff accelerator to fit the new requirements in the experiments requiring different kinds of heavy cluster ions. Through all of those efforts, we have made our system much more useful and better to fit the requirements of atom-molecule physics researches supported by The China National Science Foundation.The discovery of Nuclear Magnetic Resonance (NMR) phenomenon raised a new precise method for the study and measurement of nuclear structure and nuclear momentum. NMR has been used as an important experiment technology as well as a research tool in physics, chemistry, biology and many other fields. Since the unique and precise feature owned by the method of NMR in the measurement of magnetic field, it has been widely used in the measurement of the magnetic field in the accelerators. On account of the poor automation and the requirement for human adjustment in many NMR instruments, which have been seriously affected the precision of NMR method, we have developed an intelligent subsystem of NMR magnetic field measurement with some special features, such as wide ranges of measurement of magnetic fields, best real time feature and excellent ability of anti-interference. This subsystem was consisted of single chip microcomputers and a PC computer. And the main factors affected the sensitivity in the NMR measurement were studie...