Simulation of gain and timing resolution in saturated pores

Micro-channel plate (MCP) amplifiers are commonly used in detectors of fast time signals with picosecond resolution. The main parameters of the MCP amplifier, such as the gain factor and time resolution are strongly dependent on the work regime of the device. The saturation effects occur with a high-level input signal. In our paper these effects are studied numerically for large-area fast photo-detectors. It is shown that the saturation effect for short pulses can be reduced by introducing a thin, resistive layer between the bulk material and the emissive coating. A set of 2D and 3D numerical tools (MCP simulator, Monte Carlo simulator) was developed to simulate photo, secondary emission, fringe fields, and saturation phenomena in MCP amplifiers. The gain and time resolution dependencies on the pore size and voltage were studied numerically. The results are compared with the simulations of other authors and available experimental data.