Subjects: Nuclear Science and Technology >> Nuclear Science and Technology submitted time 2024-05-09
Abstract： [Background]: In neutral beam injectors, the calorimetric target is one of the most important water-cooled components, responsible for receiving and measuring beam power. In addition, by using a built-in thermocouple array, the temperature rise at different positions of the target plate can be monitored in real-time, thereby obtaining the power density distribution of the extracted ion beam or neutral beam. [Purpose]: Develop a calorimetric target for the neutral beam injector in the HL-3 device, which can meet the requirements of target plate lifting and thermal load absorption. [Methods]: The design of the calorimetry target adopts a linear push rod mechanism to achieve lifting and lowering, and adopts a "W" - shaped target plate structure to achieve absorption of neutral beam energy. In addition, the fluid calculation module of Ansys Workbench was used to simulate the temperature distribution of the calorimetry target under full power operation. [Results]: Under full power operating conditions, the deflecting magnet is opened, and the maximum temperature rise of the calorimetry target is 526.4 degrees Celsius, which can be lowered to room temperature within half a minute, meeting the requirements for the use of the beam line. [Conclusions]: Successfully developed a calorimetric target that meets usage requirements.
submitted time 2024-04-20
Abstract： [Background]: In neutral beam injectors, the calorimetric target is one of the most important water-cooled components, responsible for receiving and measuring beam power. In addition, by using a built-in thermocouple array, the temperature rise at different positions of the target plate can be monitored in real-time, thereby obtaining the power density distribution of the extracted ion beam or neutral beam. [Purpose]: Develop a calorimetric target for the neutral beam injector in the HL-3 device, which can meet the requirements of target plate lifting and thermal load absorption. [Methods]: The design of the calorimetry target adopts a linear push rod mechanism to achieve lifting and lowering, and adopts a "W" - shaped target plate structure to achieve absorption of neutral beam energy. In addition, the fluid calculation module of Ansys Workbench was used to simulate the temperature distribution of the calorimetry target under full power operation. [Results]: Under full power operating conditions, the deflecting magnet is opened, and the maximum temperature rise of the calorimetry target is 526.4 degrees Celsius, which can be lowered to room temperature within half a minute, meeting the requirements for the use of the beam line. [Conclusions]: Successfully developed a calorimetric target that meets usage requirements.
submitted time 2024-04-19
Abstract： [Background]: High energy, strong current, and long pulse neutral beam negative ion source technology is one of the core technologies for achieving combustion conditions in magnetic confinement fusion reactor plasma. [Purpose]:In order to meet the beam diagnosis requirements of the long pulse high-power negative ion source experimental platform under the parameters of 200kV/20A, a V-shaped target plate was designed based on the beam power density distribution and beam spot size for the calorimeter target physical structure. [Methods]: Using Workbench software for simulation calculation, the temperature distribution of the ion beam intercepted by the calorimeter target at a water flow rate of 80m3/h was obtained, with a maximum temperature of 610℃. [Results]: Based on the simulation calculation results and the engineering structure of the test platform, the engineering design of the calorimeter target was completed. [Conclusions]: The calorimeter target has a compact structure, meets diagnostic requirements, and can operate safely with long pulse.
submitted time 2024-04-19
Abstract： [Background]: The high parameter operation of the HL-3 requires the enhancement of the neutral beam injection heating capacity. [Purpose]: According to the overall design requirements of the No. 2 neutral beam injection beam of HL-3 device 7MW/120keV, a 3D model of the injector deflection magnet based on 8 pie coils was established. [Methods]: The electromagnetic field simulation software CST Studio was used to calculate the corresponding relationship between the excitation current of different ion beams with different energies deflected by 180°by the deflecting magnet, and the deflection trajectory and magnetic field distribution generated by the deflecting magnet deflected major residual ions under the 180°excitation current. [Results]: On the basis of the simulation analysis results, the engineering design, machining and testing of the magnet are completed. [Conclusions]: The magnetic field test results of the deflection magnet show that the deviation between the measured value and the calculated value of CST is about 3%, which meets the design requirements of the injector deflection magnet.
submitted time 2024-04-19
Abstract： [Background]: Neutral beam injection (NBI) is an important means of plasma heating and current driving on HL-3 Tokamak. NBI heating system is a multi-disciplinary and multi-field complex systems which involves vacuum technology, power electronics, mechanics, automatic control, gas discharge and so on. The control system is the basic guarantee for the reliable operation of the NBI heating system. [Purpose]: In order to achieve real-time monitoring field devices in NBI beamline, a programmable logic controller(PLC) system based on Profibus protocol was designed. [Methods]: The hardware configuration of PLC system can be determined according to the requirement of NBI beamline, a Profibus-DP network and Ethernet with master controller make a distributed I/O system.The STEP7 software of Siemens are used as the design, hardware and network configuration of the control program for the development platform. [Results]: The PLC system can monitor the field devices status in real time ,exchange data with NBI control system and instruct field devices work stably. In addition ,full graphical user interface can realize the visualization of system operation ,vacuum and temperature display in real-time, which will provide a timely state information for operator. [Conclusions]: The whole PLC system is efficient, reliable, reproducible , well compatible and scalable, which can be used to monitor and control the field devices in NBI beamline.
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