Two curved crystal spectrometers are set up on the "QiangGuang-1" generator to measure the z-pinch plasma spectra emitted from planar aluminum wire array loads.Kodak Biomax-MS film and an IRD AXUVHS5# array are employed to record time-integrated and time-resolved free-bound radiation,respectively.The photon energy recorded by each detector is ascertained by using the L-shell lines of molybdenum plasma.Based on the exponential relation between the continuum power and photon energies,the aluminum plasma electron temperatures are measured.For the time-integrated diagnosis,several "bright spots" indicate electron temperatures between(450 eV～520 eV)±35%.And for the time-resolved ones,the result shows that the electron temperature reaches about 800 eV±30%at peak power. The system satisfies the demand of z-pinch plasma electron temperature diagnosis on a～1 MA facility.
The high-pressure shock wave data obtained in underground nuclear tests and high-power laser experiments are analyzed using a three-term equation of state and the Hugoniot relationship. Apart from the good agreement of the predicted results with experimental data related to samples Pb, Cu, and Au, an obvious deviation of the experimental data of the Fe sample from the corresponding numerical ones is found, and various comparisons of the data imply that the errors are likely to occur in the measurement rather than in the theoretical prediction. Plentiful data pertaining to a set of metal materials on shock adiabats reveal that there exists an asymptotic parabolic relationship between shock pressure or temperature and particle velocity for very strong shock waves, in contrast to the experimentally well-known linear relationship between shock wave velocity and particle velocity. All these are expounded physically in detail.
The resistance and inductance of a wire array during an implosion are very important parameters of interest to researchers.A variety of inductances and resistances directly affect the kinetic energy and resistance heat energy coupled from a pulsed-power generator.In this paper,the inductance and resistance of a planar wire array during the Z-pinch process are analyzed.The inductance is calculated from the data obtained by a time-resolved soft X-ray framed camera,while the resistance is calculated through the voltage and the current of the wire array load combined with the variety of the inductance.The results show that the resistance of the load increases with the development of the implosion,and reaches its maximum at 0.29±0.16 near the pinched time.
