[en] In order to solve the problems of scattered layout of the data acquisition system and easily attenuated and interfered signals in the HL-2 M diagnostic equipment, a novel ethernet distributed data acquisition system and a management scheme are present. The acquisition module has an ethernet interface, which can be distributed in the remote distance and connected to the local area network easily. The functions of data acquisition, storage, upload and centralized management can be achieved in the centralized management system, which works in the client/server and different levels management mode, through using the technology of multi-thread socket network communication. The discharge experiment tests prove that the acquisition system has the characteristics of accurate measurement, strong anti-interference performance, fast speed data transmission, convenient deployment and management, and can satisfy the data requirement of plasma physics diagnosis system. (authors)

[en] Highlights: • A new type of slave node RTS-8C-4T03 to support subsystems with non-PXI/PXIe hardware. • Developed a communication command table according to the requirements of the timing system. • The specified delay relative to the initial timestamp of the plasma discharge. • Good stability and expansibility. The maximum ion temperature of HL-2M core plasma will exceed 12 KeV, and the current intensity, volume, heating and driving power of plasma are 6 times, 3 times and 2.5 times that of HL-2A, respectively. Timing system is an important component of control and data acquisition system, ensures that each relatively independent subsystem will be put into operation more accurately according to the scheduled time during plasma discharge, and associates each sampled data of acquisition system with timestamp, which is a significant quality improvement for the control and experimental data analysis of HL-2M related subsystems. Last year, we tested the synchronization deviation of clocks and triggers of the timing system based on the PXI/PXIe hardware. The results showed that this network architecture can meet our accuracy requirements for the timing system. However, in addition to PXI/PXIe hardware, HL-2M contains a large number of subsystems with other bus interfaces. Therefore, we developed a new type of slave node RTS-8C-4T03 to support subsystems with non-PXI/PXIe hardware, and the device can be compatible with the existing network architecture of HL-2M timing system. In addition, we have formulated the communication commands of HL-2M timing system, and the configuration and operation of clocks and triggers of all nodes are strictly implemented according to the definition of the communication commands. The test results show that the clock synchronization and triggering deviation of current HL-2M timing system is within 65 ns, which can fulfill the relevant engineering requirements of HL-2M diagnostic systems and advanced divertor configurations.

[en] Through the analysis of the parameters of the poloidal field (PF) coils and the control requirements of the first plasma discharge on HL-2 M tokamak, the advanced control integration technology based on the real-time system and reflection memory (RFM) is adopted to design the first plasma control system (PCS) on HL-2 M device. The new system realizes the stable 1 ms control period and real-time data transmission and solves the real-time control period and data transmission delay. The experimental results show that the new PCS can meet the current control requirements of PF coils for the first plasma. (authors)