A high-current pulse forming network (PFN) has been developed for applications to artificial solar-wind generation. It is switched by staticinduction thyristor (SIThy) and is capable of generating pulsed current of ~...A high-current pulse forming network (PFN) has been developed for applications to artificial solar-wind generation. It is switched by staticinduction thyristor (SIThy) and is capable of generating pulsed current of ~9.7 kA for a time duration of ~1 ms. The SIThy switch module ismade that it can be controlled by an optical signal and it can be operated at elevated electrical potential. The experiments reported in this paperused two switch modules connected in series for maximum operating voltage of 3.5 kV. The experimental results have demonstrated a pulsedhigh-current generator switched by semiconductor devices, as well as the control and operation of SIThy for pulsed power application.展开更多
To investigate the feasibility for a helical line to be used as a pulse forming line （PFL）, the transmission characteristics of the helical transmission line is studied both theoretically and experimentally. The res...To investigate the feasibility for a helical line to be used as a pulse forming line （PFL）, the transmission characteristics of the helical transmission line is studied both theoretically and experimentally. The results indicate that it is feasible to employ a helical line as a long-pulse PFL, and the influence of its dispersion is negligible. Compared with a conventional coaxial PFL, the helical PFL with the same size can produce a longer pulse.展开更多
This paper provides a review of the compact intense electron-beam accelerators (IEBAs) based on liquid pulse forming lines (PFLs) that havebeen developed at the National University of Defense Technology (NUDT) in Chin...This paper provides a review of the compact intense electron-beam accelerators (IEBAs) based on liquid pulse forming lines (PFLs) that havebeen developed at the National University of Defense Technology (NUDT) in China. The history and roadmap of the compact IEBAs used todrive high-power microwave (HPM) devices at NUDT are reviewed. The properties of both de-ionized water and glycerin as energy storagemedia are presented. Research into the breakdown properties of liquid dielectrics and the desire to maximize energy storage have resulted in theinvention of several coaxial PFLs with different electromagnetic structures, which are detailed in this paper. These high energy density liquidPFLs have been used to increase the performance of IEBA subsystems, based on which the SPARK (Single Pulse Accelerator with spark gaps)and HEART (High Energy-density Accelerator with Repetitive Transformer) series of IEBAs were constructed. This paper also discusses howthese compact IEBAs have been used to drive typical HPM devices and concludes by summarizing the associated achievements and theconclusions that can be drawn from the results.展开更多
A 40kV/6kA pulsed power supply was designed for the Rapid Cycling Synchrotron(RCS)extraction kicker magnet of the China Spallation Neutron Source.The calculation of the pulsed power supply's parameters,the design ...A 40kV/6kA pulsed power supply was designed for the Rapid Cycling Synchrotron(RCS)extraction kicker magnet of the China Spallation Neutron Source.The calculation of the pulsed power supply's parameters,the design of power supply's system,the optimization of pulse forming network(PFN)are introduced in this paper.The magnet current pulse waveform is simulated by PSpice program in the situation of 36.5kV charging voltage.The simulation explains the influence of the PFN section number and the transmission cable length on the magnet current pulse.展开更多
In this work,the magnetic pulse forming process was used to flange the AA 3003-O aluminum alloy tube to improve the flanging formability limit.The results show that there are critical discharge energy values for the f...In this work,the magnetic pulse forming process was used to flange the AA 3003-O aluminum alloy tube to improve the flanging formability limit.The results show that there are critical discharge energy values for the flanging dies with varied slope angle.The mechanism of magnetic pulse flanging process is the bulging in contrast to the expanding of the quasi-static flanging.For the flanging with 90 slope degree,the limited hoop strain at the outer fringe could be up to 0.54 without rapture,to which the limit of simple tension limit is improved by 85%in contrast.The 180 degree flanging at tube end can be achieved by one time magnetic pulse forming.展开更多
The principle of Marx-pulse forming networks(PFN)is introduced in this paper.The PSpice simulation result of the Marx-PFN is presented and a smooth waveform is obtained in the condition of equal capacitance.Through op...The principle of Marx-pulse forming networks(PFN)is introduced in this paper.The PSpice simulation result of the Marx-PFN is presented and a smooth waveform is obtained in the condition of equal capacitance.Through optimizing the parameters of the networks,a 4-stage Marx-PFN has been built,a 40kV output with a FWHM of 3μs and a fiat-top of 2μs is obtained on the marched resistance of 18Ωwhen the Marx-PFN is changed to 20kV.展开更多
文摘A high-current pulse forming network (PFN) has been developed for applications to artificial solar-wind generation. It is switched by staticinduction thyristor (SIThy) and is capable of generating pulsed current of ~9.7 kA for a time duration of ~1 ms. The SIThy switch module ismade that it can be controlled by an optical signal and it can be operated at elevated electrical potential. The experiments reported in this paperused two switch modules connected in series for maximum operating voltage of 3.5 kV. The experimental results have demonstrated a pulsedhigh-current generator switched by semiconductor devices, as well as the control and operation of SIThy for pulsed power application.
基金supported by the National 863 Project of China (Grant No. 2005AA835051)
文摘To investigate the feasibility for a helical line to be used as a pulse forming line （PFL）, the transmission characteristics of the helical transmission line is studied both theoretically and experimentally. The results indicate that it is feasible to employ a helical line as a long-pulse PFL, and the influence of its dispersion is negligible. Compared with a conventional coaxial PFL, the helical PFL with the same size can produce a longer pulse.
基金This work was supported by the National Natural Science Foundation of China under Grant No.51677190the Hunan Provincial Natural Science Foundation of China under Grant No.2017JJ1005.
文摘This paper provides a review of the compact intense electron-beam accelerators (IEBAs) based on liquid pulse forming lines (PFLs) that havebeen developed at the National University of Defense Technology (NUDT) in China. The history and roadmap of the compact IEBAs used todrive high-power microwave (HPM) devices at NUDT are reviewed. The properties of both de-ionized water and glycerin as energy storagemedia are presented. Research into the breakdown properties of liquid dielectrics and the desire to maximize energy storage have resulted in theinvention of several coaxial PFLs with different electromagnetic structures, which are detailed in this paper. These high energy density liquidPFLs have been used to increase the performance of IEBA subsystems, based on which the SPARK (Single Pulse Accelerator with spark gaps)and HEART (High Energy-density Accelerator with Repetitive Transformer) series of IEBAs were constructed. This paper also discusses howthese compact IEBAs have been used to drive typical HPM devices and concludes by summarizing the associated achievements and theconclusions that can be drawn from the results.
文摘A 40kV/6kA pulsed power supply was designed for the Rapid Cycling Synchrotron(RCS)extraction kicker magnet of the China Spallation Neutron Source.The calculation of the pulsed power supply's parameters,the design of power supply's system,the optimization of pulse forming network(PFN)are introduced in this paper.The magnet current pulse waveform is simulated by PSpice program in the situation of 36.5kV charging voltage.The simulation explains the influence of the PFN section number and the transmission cable length on the magnet current pulse.
基金Item Sponsored by National Basic Research Program of China[973 Program][2011CB012805]
文摘In this work,the magnetic pulse forming process was used to flange the AA 3003-O aluminum alloy tube to improve the flanging formability limit.The results show that there are critical discharge energy values for the flanging dies with varied slope angle.The mechanism of magnetic pulse flanging process is the bulging in contrast to the expanding of the quasi-static flanging.For the flanging with 90 slope degree,the limited hoop strain at the outer fringe could be up to 0.54 without rapture,to which the limit of simple tension limit is improved by 85%in contrast.The 180 degree flanging at tube end can be achieved by one time magnetic pulse forming.
文摘The principle of Marx-pulse forming networks(PFN)is introduced in this paper.The PSpice simulation result of the Marx-PFN is presented and a smooth waveform is obtained in the condition of equal capacitance.Through optimizing the parameters of the networks,a 4-stage Marx-PFN has been built,a 40kV output with a FWHM of 3μs and a fiat-top of 2μs is obtained on the marched resistance of 18Ωwhen the Marx-PFN is changed to 20kV.
