LAUSR

Abstract A pulse-dilation framing tube with large aperture short magnetic lens is simulated by using Monte Carlo method. The photo-cathode (PC) sensitive diameter is 60 mm, and the image ratio is 2:1. While a -3.15 kV dc voltage overlap by an excitation pulse with gradient of 3 V/ps are applied on PC, a gating pulse with width of 225 ps and amplitude of -1.3 kV plus a −100 V dc bias are for the microchannel plate (MCP), the temporal resolution and spatial resolution are 7.8 ps, 11 lp/mm, respectively. The electron beam temporal magnification factor is about 10.3. The relationship between the spatial resolution and the PC electron beam emitting point is obtained. The variation of the temporal magnification factor and temporal resolution with the PC excitation pulse gradient is also given. Furthermore, the connection between the spatial resolution and the PC excitation pulse gradient is acquired.