Simulation of microchannel plate photomultiplier tube in high magnetic fields

Abstract

The microchannel plate photomultiplier tube (MCP-PMT) used in high energy physics experiments usually needs to be able to operate in strong magnetic fields. In this paper, a 3D MCP-PMT model is developed in CST studio suite to study the magnetic field up to 5 T effect on the photoelectrons traveling from the photocathode to the MCP. Results predict that a growing number of photoelectrons strike back to the photocathode with enhancing magnetic field, which not only decreases electron collection efficiency and gain, but also impairs the photocathode lifetime. • The effect of magnetic fields up to 5 T on the photoelectrons is studied. • Results predict that photoelectrons could strike back to the photocathode. • High magnetic fields decrease collection efficiency and photocathode lifetime.