ELECTRON MULTIPLIER

摘要

An electron multiplier which can effectively prevent the occurrence of electric field leakage on the front side of an MCP caused by a voltage applied across the MCP and, at the same time, has such a structure that can be easily attached to and detached from the MCP and can prevent damages, etc., to the MCP at working time. The electron multiplier is provided with the MCP as an electron multiplying means and an external electric field shielding member which houses the MCP. The electric field shielding cap is provided with a barrel section surrounding at least the side face of the MCP. In addition, the multiplier is constructed in such a way that the external electric field shielding member is mounted on the base of the multiplier in a state where the MCP is clamped with the external electric field shielding member and an internal electric field shielding member housed in the external electric field shielding member, so as to easily mount and dismount the MCP.