A slice-based data acquisition system for long duration discharges of EAST

Pulse of up to 1000 seconds with 0.5 MA plasma current is the main objective of EAST (Experimental Advanced Superconducting Tokamak) discharge experiments. For long duration discharge, real-time diagnostics is indispensable. To meet the requirement, a slice-based data acquisition system for long duration discharge has been designed and developed. This paper gives an overview of this system. The slice-based data acquisition system is based on time slice mechanism, which divides continuous experimental data into slices. And the time slice of data are transferred, stored, published in real-time while collecting data. Moreover, the introduction of multi-stage storage and time window greatly enhanced the speed of mass data access. The slice-based data acquisition system has been reliably operated in the EAST experimental campaigns.