The Implementation of Data Acquisition System for EAST Technical Diagnostic System

EAST (Experimental Advanced Superconducting Tokamak) Technical Diagnostic System (TDS) is used to monitor the outlet temperature of all superconducting coils, in case of a temperature anomaly, it will trigger the safety interlock system to meet EAST device safety requirements. The data acquisition system of the TDS (TDS_DAQ) is in charge of continuous dataacquisition of the nitrogen and helium temperature signals, the TDS security alarm, and long-term data storage. The TDS_DAQ has several functions. (a) Data acquisition. This includes thenitrogen data acquisition and the helium data acquisition. The nitrogen data acquisition is based on the PXI technology and the helium data acquisition obtains data from the Lake Shore model 224 temperature monitors based on Ethernet. (b) Data storage. The measured value of the nitrogen signals should be converted with linear formulas, while the helium signals do not need any conversion due to the Lake Shore model 224 temperature monitors internal calculations. After conversion, the data should be stored with MySQL and MDSPlus, which has been used for long-term storage. (c) Security alarm. After threshold evaluation of some key temperature signals, the TDS_DAQ outputs the TDS fault signal and the status signal to trigger the safety interlock system to take actions. (d) Data service. The TDS_DAQ keeps publishing the TDS data to the cryogenic system via TCP/IP and provides an information inquiry service for the TDSadministrator to conveniently get the alarm information and the TDS data. The TDS_DAQ has been deployed and used in the 2018 EAST campaign.