Because of their economy and applicability,high-power thyristor devices are widely used in the power supply systems for large fusion devices.When high-dose neutrons produced by deuterium–tritium(D–T)fusion reactions...Because of their economy and applicability,high-power thyristor devices are widely used in the power supply systems for large fusion devices.When high-dose neutrons produced by deuterium–tritium(D–T)fusion reactions are irradiated on a thyristor device for a long time,the electrical characteristics of the device change,which may eventually cause irreversible damage.In this study,with the thyristor switch of the commutation circuit in the quench protection system(QPS)of a fusion device as the study object,the relationship between the internal physical structure and external electrical parameters of the irradiated thyristor is established.Subsequently,a series of targeted thyristor physical simulations and neutron irradiation experiments are conducted to verify the accuracy of the theoretical analysis.In addition,the effect of irradiated thyristor electrical characteristic changes on the entire QPS is studied by accurate simulation,providing valuable guidelines for the maintenance and renovation of the QPS.展开更多
Magnetized target fusion is an alternative method to fulfill the goal of controlled fusion, which combines advan- tages of both magnetic confinement fusion and inertial confinement fusion since its parameter space lie...Magnetized target fusion is an alternative method to fulfill the goal of controlled fusion, which combines advan- tages of both magnetic confinement fusion and inertial confinement fusion since its parameter space lies between the two traditional ways. Field reversed configuration （FFtC） is a good candidate of magnetized targets due to its translatable, compressible, high /3 and high energy density properties. Dynamic formation process of high density FFtC is observed on the YingGuang 1 device for the first time in China. The evolution of a magnetic field is detected with magnetic probes, and the compression process can be clearly seen from images taken with a high-speed multi-frame CCD camera. The process is also studied with two-dimensional magneto hydrodynamic code MPF-2D theoretically, and the results agree well with the experiment. Combining the experimental data and the theoretical analysis, the length of the formed FRC is about 39 cm, the diameter is about 2-2. 7cm, the average density is 1.3× 1016 cm-3, and the average temperature is 137eV.展开更多
The rapid rise of commercial compact fusion devices has triggered fast-growing demand for high-temperature superconducting tapes,creating a major opportunity for the high-temperature superconducting(HTS)tape industry....The rapid rise of commercial compact fusion devices has triggered fast-growing demand for high-temperature superconducting tapes,creating a major opportunity for the high-temperature superconducting(HTS)tape industry.Pulsed laser deposition(PLD)has been extensively applied for fabrication of heteroepitaxial HTS wires or tapes based on REBCO-type superconductor,also referred to as,coated conductors(CCs).A combination of multi-plume,multi-turn deposition technique and use of high-power excimer lasers has enabled and accelerated the industrialization of REBCO coated conductors.Currently,the annual production of top-tier PLD-based,HTS-wire manufacturers exceeds 3,000 km-12 mm,contributing to over half of the total global HTS wire production.PLD-REBCO tapes have demonstrated excellent in-field performance(I_(c)>200 A-4 mm@20K,20T,B//c)and competitive pricing(∼$20/m).PLD technology continues to evolve,demonstrating strong competitive advantages.However,challenges remain in further cost reduction,process stability,and increasing efficiency of raw material utilization.AI-based data mining and tackling emerging fundamental issues are seen as potential solutions to further improve stability and performance.展开更多
基金supported by the Fundamental Research Funds for the Central University(No.JZ2023HGTA0182)Comprehensive Research Facility for Fusion Technology Program of China(No.2018-000052-73-01-001228)。
文摘Because of their economy and applicability,high-power thyristor devices are widely used in the power supply systems for large fusion devices.When high-dose neutrons produced by deuterium–tritium(D–T)fusion reactions are irradiated on a thyristor device for a long time,the electrical characteristics of the device change,which may eventually cause irreversible damage.In this study,with the thyristor switch of the commutation circuit in the quench protection system(QPS)of a fusion device as the study object,the relationship between the internal physical structure and external electrical parameters of the irradiated thyristor is established.Subsequently,a series of targeted thyristor physical simulations and neutron irradiation experiments are conducted to verify the accuracy of the theoretical analysis.In addition,the effect of irradiated thyristor electrical characteristic changes on the entire QPS is studied by accurate simulation,providing valuable guidelines for the maintenance and renovation of the QPS.
基金Supported by the Development Foundation of China Academy of Engineering Physics under Grant No 2011B0402009the National Natural Science Foundation of China under Grant Nos 11375163,11575029 and 11175028
文摘Magnetized target fusion is an alternative method to fulfill the goal of controlled fusion, which combines advan- tages of both magnetic confinement fusion and inertial confinement fusion since its parameter space lies between the two traditional ways. Field reversed configuration （FFtC） is a good candidate of magnetized targets due to its translatable, compressible, high /3 and high energy density properties. Dynamic formation process of high density FFtC is observed on the YingGuang 1 device for the first time in China. The evolution of a magnetic field is detected with magnetic probes, and the compression process can be clearly seen from images taken with a high-speed multi-frame CCD camera. The process is also studied with two-dimensional magneto hydrodynamic code MPF-2D theoretically, and the results agree well with the experiment. Combining the experimental data and the theoretical analysis, the length of the formed FRC is about 39 cm, the diameter is about 2-2. 7cm, the average density is 1.3× 1016 cm-3, and the average temperature is 137eV.
基金support from the National Natural Science Foundation of China(Grant No.52277027)the Scientific Research Program of Science and Technology commission of Shanghai Municipality(Grant No.23511101500)+1 种基金financial supported from the China Postdoctoral Science Foundation(Grant No.2024M761969)Amit Goyal acknowledges financial support from Office of Naval Research(ONR),Grant No.N00014-21-1-2534.Hannu Huhtinen and Petriina Paturi acknowledge financial support from the Jenny and Antti Wihuri Foundation.
文摘The rapid rise of commercial compact fusion devices has triggered fast-growing demand for high-temperature superconducting tapes,creating a major opportunity for the high-temperature superconducting(HTS)tape industry.Pulsed laser deposition(PLD)has been extensively applied for fabrication of heteroepitaxial HTS wires or tapes based on REBCO-type superconductor,also referred to as,coated conductors(CCs).A combination of multi-plume,multi-turn deposition technique and use of high-power excimer lasers has enabled and accelerated the industrialization of REBCO coated conductors.Currently,the annual production of top-tier PLD-based,HTS-wire manufacturers exceeds 3,000 km-12 mm,contributing to over half of the total global HTS wire production.PLD-REBCO tapes have demonstrated excellent in-field performance(I_(c)>200 A-4 mm@20K,20T,B//c)and competitive pricing(∼$20/m).PLD technology continues to evolve,demonstrating strong competitive advantages.However,challenges remain in further cost reduction,process stability,and increasing efficiency of raw material utilization.AI-based data mining and tackling emerging fundamental issues are seen as potential solutions to further improve stability and performance.
