Optimization Design Of EAST-NBI Data Acquisition System

Neutral Beam Injection(NBI)system is one of the components of the high power auxiliary heating and current driving system on the Experimental Super Superducting Tokomak(EAST).In order to make the data obtained by the NBI data acquisition system compatible with EAST experimental data and to make international exchange of experimental results effective,this paper optimizes the EAST-NBI data acquisition system,the NBI data acquisition system based on CPCI-9116 and the server application system based on MDSplus are designed and implemented.The NBI data acquisition system based on CPCI-9116 has designed and implemented four modules in detail:data acquisition module,experimental data processing module,experimental data compression module and experimental data transmission module.The acquisition system is a powerful tool for obtaining signals in NBI long pulse discharge experiment.It adopts double buffering technology and multi-thread mechanism to obtain physical signals from NBI discharge experiment.The acquisition system converts the analog signal into physical experimental data and saves it to the data acquisition device.The original experimental data is segmented by channel and compressed by LZO(Lempel-Ziv-Oberhumer)lossless data compression algorithm with relatively high real-time and compression ratio.The processed experimental data is uploaded to the server for data access and processing of laboratory personnel.It provides a data base for physical researchers to analyze and study NBI experiments.The server application system based on MDSplus has designed and implemented four modules in detail:creating a model tree module,creating a pulse tree module,an experimental data access module and an experimental data processing module.The system collects the experimental data collected by the equipment for effective storage and management and provides both local and remote access to experimental data.The system is user-friendly and fully interoperable.Also the system provides a function interface for handling experimental data and facilitates physical researchers to use other software to obtain experimental data and perform in-depth analysis.The satisfied result has met the requirements of the experiment in the test and the system is going to be applied to EAST-NBI long-pulse injection experiments.