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.
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