Abstract
The detailed design and implementation of the control system for the Thomson scattering (TS) diagnostic on the ENN's XuanLong-50 (EXL-50) spherical tokamak are presented. It consists of three main sub-systems connected by a local network and a master PC. The laser operation control sub-system manages the Nd-YAG laser operation, the safety interlock, and the laser alignment. The timing control sub-system manages the deployment and triggering sequence of each instrument. The waveforms of scattered signals are directly digitized with the data acquisition sub-system and are uploaded to the MDSplus database by the master PC. During the phase-I operation of EXL-50, the typical electron density is on the order of 1018m−3. The relatively low density results in a low signal level below the noise floor. The implementation of a multi-pulse averaging technique improves the signal-to-noise ratio (SNR) at the cost of time resolution.
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