Effect of surface insulation on early stage of tungsten planar wire array Z-pinch

The effect of surface insulation for the tungsten planar wire arrays was studied on QiangGuang-Ⅰ facility. Utilizing the phenomena analysis, the X-ray radiation of the surface insulated wire arrays (SIWA) is considerably delayed and the delay time is dependent upon the width of the wire array. Strong cathode emission is also observed in the SIWA Z-pinch experiments. The amplitude of X-ray plateau before the main pulse in the SIAW experiments is 2 times of that in the standard wire array (SWA) experiments. The duration of the X-ray plateau of the SIAW is longer than that of SAW. The cooler effect due to the single wire plasma expansion in SIAW experiments is much stronger compared with that in SAW experiments. The similar macro magneto hydrodynamics instability structure is observed in both SIAW and SAW experiments.