摘要
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.
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.
