PURPOSE: An apparatus for generating beam ions is provided to determine a supply of power by attaching an electron beam generation module at a socket part of a main body. CONSTITUTION: One side of a socket part(600) is opened. The socket part includes an internal space formed therein. An electron beam generation module(100) is selectively coupled with an internal space of the socket part. The electron beam generation module is attached to or is detached from the inner space of the socket part. The electron generation module generates an electron beam by receiving the electric power from the outside. A power supply unit(700) provides the electric power to the electron beam module.
