Development of data acquisition and over-current protection systems for a suppressor-grid current with a neutral-beam ion source

摘要

Neutral beam injection is one of the effective auxiliary heating methods in magnetic-confinement-fusion experiments.In order to acquire the suppressor-grid current signal and avoid the grid being damaged by overheating,a data acquisition and over-current protection system based on the PXI (PCI eXtensions for Instrumentation) platform has been developed.The system consists of a current sensor,data acquisition module and over-current protection module.In the data acquisition module,the acquired data of one shot will be transferred in isolation and saved in a data-storage server in a txt file.It can also be recalled using NBWave for future analysis.The over-current protection module contains two modes:remote and local.This gives it the function of setting a threshold voltage remotely and locally,and the forbidden time of over-current protection also can be set by a host PC in remote mode.Experimental results demonstrate that the data acquisition and over-current protection system has the advantages of setting forbidden time and isolation transmission.