Experimental research on Z-pinch at Qiangguang-I facility
Experimental research on plasma radiation characteristics and plasma implosion of Kr gas-puff,W wire array,Ne gas-puff and Al wire array Z pinches performed on Qiangguang-Ⅰ pulsed power generator of 1.4~ 2.1 MA current with 80~100 ns rise time is reported.In the experiments,the voltage divider and two Rogowskii coils were used to measure the voltage and the current of diode respectively,a filter-XRD and a scintillator-photodiode detector with even energy respond in the energy region from 100 eV to 1 400 eV were used to measure X-ray waveforms,the Ni-film bolometer was developed for measuring the total soft X-ray energy,the time-resolved X-ray image diagnostic system was developed for recording the imploding process of Z pinches,and an elliptically-curved crystal spectrometer with temporal and spatial resolution was developed for diagnosing K-shell radiation of Z-pinch plasma.A total soft X-ray energy of 62 kJ and 32 kJ,a peak X-ray power of 1.7 TW and 1.3 TW,and a total energy transfer coefficient of 23% and 12.5% were achieved respectively for Kr gas-puff liner and for W wire-array liner.A K-shell radiation energy of 5.6 kJ and 2.3 kJ,a peak radiation power of 256 GW and 94 GW,and an energy transfer coefficient of 2% and 0.8% were achieved respectively for Ne gas-puff liner and for Al wire-array liner.The "zipper-phenomenon" was found in the imploding process of gas puff Z pinches,and the precursor phenomenon was found in the imploding process of wire array Z pinches.