HGI is assembled by the periodic conductor layers and nsulation layers

and the changing of the cycle length

the thinckness proportion of insulation layers and metal layers also affect the insulation performance.Kapton and stainless steel were selected respectively as the insulating and conducting material.The effect of different exterior electric field and different configurations on the performance of well-conditioned

flat-surface HGI assemblies was investigated by simulating the orbits of electron near the HGI surface based on finite-element software.Numerical calculation of electron orbits has shown that: ①the periodic electric field in HGI assemblies can restrain the development of electron multiplication.Better performance could be attained while L=0.2 mm and I/M=5;②the+45-degree structure shows a better performance than the standard flat-surface HGI;③ there are some limitations in the software which can not reflect the physics of vacuum surface breakdown veraciously.