One of the most important project missions of neutral beam injectors is the implementation of 100 s neutral beam injection （NBI） with high power energy t.o the plasma of the EAST superconducting tokamak. Correspondingly, it＇s necessary to construct a high-speed and reliable computer data processing system for processing experimental data, such as data acquisition, data compression and storage, data decompression and query, as well as data analysis. The implementation of computer data processing application software （CDPS） for EAST NBI is presented in this paper in terms of its functional structure and system realization. The set of software is programmed in C language and runs on Linux operating system based on TCP network protocol and multi-threading technology. The hardware mainly includes industrial control computer （IPC）, data server, PXI DAQ cards and so on. Now this software has been applied to EAST NBI system, and experimental results show that the CDPS can serve EAST NBI very well.
NBI作为最有效地等离子体加热手段之一,在世界各托卡马克装置上有广泛的应用。由于中性束注入装置的流强大,功率高的特点,为了保证设备的安全,须对其中的热承载部件进行实时温度监测。但是由于NBI装置的工作电压高达80 k V,且处于EAST复杂的电磁环境下,给温度的测量带来了很大的干扰。为了解决强电磁干扰对温度采集的影响,本文在分析干扰来源的基础上,提出了取样—存贮—判断—反馈的解决思路,利用Labview语言进行程序编写从而实现对干扰信号的滤波。实验结果表明,该方法能有效解决高压打火和等离子体破裂时对温度信号采集的影响,提高了实验数据采集的精确度。
Neutral beam injection （NBI） is recognized as one of the most effective means for plasma heating. A 100 s long pulse neutral beam with 30 keV beam energy, 10 A beam current and a 100 s long pulse modulating neutral beam with 50 keV beam energy, 16 A beam current were achieved in the EAST neutral beam injector on the test-stand. The preliminary results suggest that EAST-NBI system initially possess the ability of long pulse beam extraction.
The arc regulation method is applied to the high-current ion source for high-power hydrogen ion beam extraction for the first time. The characteristics of the arc and beam, including the probe ion saturation current, the arc power and the beam current, are studied with feedback control. The results show that the arc regulation method can be successfully applied to ion beam extraction. This lays a sound foundation for the testing of a new ion source and the operation of a conditioned ion source for neutral beam injector devices.
Neutral beam injection is one of the main plasma heating methods in nuclear fusion devices. In order to support the scientific study of the Experimental Advanced Superconducting Tokamak （EAST）, a megawatt-level high current ion source is designed and manufactured in the ASIPP, and the progress and preliminary test results will be presented in this paper.
