The Implementation of Data Acquisition System for EAST Technical Diagnostic System

Experimental Advanced Superconducting Tokamak (EAST) 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 DAQ of the nitrogen and helium temperature signals, the TDS security alarm, and long-term data storage. The TDS_DAQ has several functions: 1) DAQ, which includes the nitrogen DAQ and the helium DAQ. The nitrogen DAQ is based on the PCI eXtensions for Instrumentation technology and the helium DAQ obtains data from the Lake Shore model 224 temperature monitors based on Ethernet; 2) data storage, where 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; 3) security alarm, where 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; and 4) data service, where the TDS_DAQ keeps publishing the TDS data to the cryogenic system via transmission control protocol/internet protocol and provides an information inquiry service for the TDS administrator to conveniently get the alarm information and the TDS data. The TDS_DAQ has been deployed and used in the 2018 EAST campaign.