Subjects: Nuclear Science and Technology >> Engineering Technology of Nuclear Fusion submitted time 2024-05-12
Abstract： Background : Electron cyclotron resonance heating (ECRH) is an important heating and plasma current control method for the HL-3 tokamak. Microwave inject into plasma through the launcher, which is an important part of the ECRH system. Purpose : Design and test the ECRH launcher system of the HL-3 tokamak. Methods : Overall planning was carried out for the launcher system. Designed the transmission path and structure of the launcher. Simulated and calculated the effect of microwave injection. Tested the transmission angle and rotation speed of the launcher, and calibrated the rotation angle of the launcher. wz1 Results : The optical path design of the No. 2 upper launcher has been completed. The full range response time of the equatorial launcher is less than 90ms; The full range response time of the No. 1 upper launcher is less than 190ms. Conclusions : The optical path design of the No. 2 upper launcher meets the requirements. The control of the equatorial launcher and the No. 1 upper launcher is precise and fast, meeting the requirements for experimental use of the tokamak.
Peer Review Status:
Awaiting Review
Subjects: Nuclear Science and Technology >> Engineering Technology of Nuclear Fusion submitted time 2024-05-12
Abstract： Background The high voltage power supply is an important part of the neutral beam injection heating system, which determines the beam energy and the quality of the extraction beam current. With the gradual increase of voltage level, the PSM high voltage power supply cannot meet the experimental requirements. Purpose In order to realize the fast switching of injected power for neutral beam modulation, an inverter high voltage power supply based on super capacitor energy storage is proposed. Methods Super capacitor energy storage is adopted to reduce the required grid capacity and minimize the impact on the grid. The DC-DC resonant converter structure with soft-switching technology is used to improve the response speed of the power supply and reduce the switching loss of the switching devices. Design power module circuit topology, build system model and calculate relevant parameters based on power supply performance specifications. The charging circuit and main loop PSIM simulation model are established, and the power supply performance indexes are simulated and verified. Build the test prototype of inverter power supply module and complete the test of relevant performance indexes. Results and Conclusions After simulation and experimental verification, the power module is able to achieve a stable output of 1600V/50A, which meets the design requirements of 6MW/120kV.
Peer Review Status:Awaiting Review
Subjects: Nuclear Science and Technology >> Nuclear Science and Technology submitted time 2024-05-10
Abstract： [Background]: Electron cyclotron resonance heating (ECRH) is an important heating and plasma current control method for the HL-3 tokamak. Microwave inject into plasma through the launcher, which is an important part of the ECRH system. [Purpose]: Design and test the ECRH launcher system of the HL-3 tokamak. [Methods]: Design the transmission path and structure of the launcher. Simulate and calculate the effect of microwave injection. Test the transmission angle and rotation speed of the launcher, and calibrate the rotation angle of the launcher. [Results]: The optical path design of the No. 2 upper launcher has been completed. The full range response time of the equatorial launcher is less than 90ms; The full range response time of the No. 1 upper launcher is less than 190ms. [Conclusions]: The optical path design of the No. 2 upper launcher meets the requirements. The control of the equatorial launcher and the No. 1 upper launcher is precise and fast, meeting the requirements for experimental use of the tokamak.
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：本文介绍了基于分压供电模式的TH2103A型速调管阳极电流的测量和保护系统，分析了该供电模式下阳极电流的特点：阳极电流会出现流入或流出速调管阳极过大的情况。介绍了阳极电流的测量电路的原理和供电模式，阳极保护电路的原理和实施方案，以及在运行过程中对阳极电流的测量和保护系统进行了验证，证明该供电模式下阳极电流测量和保护系统的有效性和可靠性。本文所述供电模式和测量保护电路对基于TH2103A型束调管的运行和维护具有重要参考意义。
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.
Subjects: Computer Science >> Integration Theory of Computer Science submitted time 2020-09-28 Cooperative journals: 《计算机应用研究》
Abstract： Using the high-dimensional complex chaotic system in the chaotic ultra wideband signal can enhance the security of the signal, but reduce the easy implementation of the chaotic system. In view of the contradiction between the complexity and the easy realization of the chaotic system used in the chaotic ultra wideband, this paper designed a chaotic system with low dimension and easy to implement by using two one-dimensional chaotic maps with easy implementation based on chaos branch switching and embedding. Lyapunov exponent analysis shows that it is chaotic in a wide range of parameters. The analysis shows that the signal generated by the system cannot reflect the definite mapping relation, which not only increases the complexity of chaotic signal, but also makes the system easy to implement. The analysis also shows that this chaotic signal has good correlation. Therefore this paper also generated more secure chaotic time hopping UWB signal based on this chaotic system. At the same time, through the comparative analysis of the power spectrum of the chaotic UWB signal and the general pseudo-random time hopping UWB signal, it contains less discrete spectrum which can produce interference to other transmission systems, and also makes the chaotic UWB signal have more extensive application fields.
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