Pulsed power technology,whereas the electrical energy stored in a relative long period is released in much shorter timescale,is an efficient method to create high energy density physics(HEDP)conditions in laboratory.A...Pulsed power technology,whereas the electrical energy stored in a relative long period is released in much shorter timescale,is an efficient method to create high energy density physics(HEDP)conditions in laboratory.Around the beginning of this century,China Academy of Engineering Physics(CAEP)began to build some experimental facilities for HEDP investigations,among which the Primary Test Stand(PTS),a multi-module pulsed power facility with a nominal current of 10 MA and a current rising time~90 ns,is an important achievement on the roadmap of the electro-magnetically driven inertial confinement fusion(ICF)researches.PTS is the first pulsed power facility beyond 10 TW in China.Therefore,all the technologies have to be demonstrated,and all the engineering issues have to be overcome.In this article,the research outline,key technologies and the preliminary HEDP experiments are reviewed.Prospects on HEDP research on PTS and pulsed power development for the next step are also discussed.展开更多
Jets are commonly observed astrophysical phenomena.To study the x-ray emission characteristics of jets,a series of radial foil Z-pinch experiments are carried out on the Primary Test Stand at the Institute of Fluid Ph...Jets are commonly observed astrophysical phenomena.To study the x-ray emission characteristics of jets,a series of radial foil Z-pinch experiments are carried out on the Primary Test Stand at the Institute of Fluid Physics,China Academy of Engineering Physics.In these experiments,x-ray emission ranging from the soft region(0.1–10 keV)to the hard region(10 keV–500 keV)is observed when the magnetic cavity breaks.The radiation flux of soft x-rays is measured by an x-ray diode and the dose rate of the hard x-rays by an Si-PIN detector.The experimental results indicate that the energy of the soft x-rays is several tens of kilojoules and that of the hard x-rays is∼200 J.The radiation mechanismof the x-ray emission is briefly analyzed.This analysis indicates that the x-ray energy and the plasma kinetic energy come from the magnetic energy when the magnetic cavity breaks.The soft x-rays are thought to be produced by bremsstrahlung of thermal electrons(∼100 eV),and the hard x-rays by bremsstrahlung of super-hot electrons(∼mega-electron-volt).These results may be helpful to explain the xray emission by the jets from young stellar objects.展开更多
文摘Pulsed power technology,whereas the electrical energy stored in a relative long period is released in much shorter timescale,is an efficient method to create high energy density physics(HEDP)conditions in laboratory.Around the beginning of this century,China Academy of Engineering Physics(CAEP)began to build some experimental facilities for HEDP investigations,among which the Primary Test Stand(PTS),a multi-module pulsed power facility with a nominal current of 10 MA and a current rising time~90 ns,is an important achievement on the roadmap of the electro-magnetically driven inertial confinement fusion(ICF)researches.PTS is the first pulsed power facility beyond 10 TW in China.Therefore,all the technologies have to be demonstrated,and all the engineering issues have to be overcome.In this article,the research outline,key technologies and the preliminary HEDP experiments are reviewed.Prospects on HEDP research on PTS and pulsed power development for the next step are also discussed.
基金The authors wish to thank the PTS crew and all those contributing to this work.This work was supported in part by Science Challenge Program Grant No.JCKY2016212A505 and by NSFC Grant Nos.11605188 and 11705186.
文摘Jets are commonly observed astrophysical phenomena.To study the x-ray emission characteristics of jets,a series of radial foil Z-pinch experiments are carried out on the Primary Test Stand at the Institute of Fluid Physics,China Academy of Engineering Physics.In these experiments,x-ray emission ranging from the soft region(0.1–10 keV)to the hard region(10 keV–500 keV)is observed when the magnetic cavity breaks.The radiation flux of soft x-rays is measured by an x-ray diode and the dose rate of the hard x-rays by an Si-PIN detector.The experimental results indicate that the energy of the soft x-rays is several tens of kilojoules and that of the hard x-rays is∼200 J.The radiation mechanismof the x-ray emission is briefly analyzed.This analysis indicates that the x-ray energy and the plasma kinetic energy come from the magnetic energy when the magnetic cavity breaks.The soft x-rays are thought to be produced by bremsstrahlung of thermal electrons(∼100 eV),and the hard x-rays by bremsstrahlung of super-hot electrons(∼mega-electron-volt).These results may be helpful to explain the xray emission by the jets from young stellar objects.
