Nowadays, Microchannel Plate (MCP), as a kind of electron multiplier based on the secondary electron emission, is widely used in many high-sensitive experiments, such as neutrino detection, which require as low noise as possible, while the conventional straight channel MCP will definitely have ion feedback, resulting in the sequential after-pulses being the major source of noise. Normally, the problem can be effectively avoided by coupling two straight MCPs in cascade and combining the channels into a "V" shape known as chevron MCPs, but this method is limited by the manufacturing techniques due to the inevitable gap that will worsen the resolution and peak-to-valley ratio. However, the ion feedback can be inhibited significantly for MCPs with curved-channels. Based on the Geant4 Monte Carlo simulation framework, we investigate how the geometrical parameters of curved-channel MCP influence the gain and get the optimum pore diameter for the maximum gain with a fixed thickness and applied voltage. Additionally, the track-by-track simulation reveals that the average acceleration distance of a secondary electron inside the curved-channel is approximately 20~$\mu$m with a voltage of 950~V, a length-to-diameter ratio of 100:1, and a pore diameter of 20~$\mu$m.
Comment: 20 pages, 12 figures