an arc chamber provided with a slit for ion extraction and forming an equipotential surface with a first voltage, wherein the arc chamber has first, second, third, and fourth surfaces, the second and third surfaces are perpendicular to the first and fourth surfaces, and the slit is provided through the first surface of the arc chamber;

a filament, installed inside of the arc chamber, heated to a predetermined temperature, and generating electrons, wherein the filament is installed inside of the arc chamber to correspond to a second surface, which is perpendicular to the first surface;

first and second magnetic field devices, positioned outside of the arc chamber, supplied with a current from a current source, and generating a magnetic field in the arc chamber for ion extraction, wherein the first magnetic field device is positioned outside of the arc chamber in a position corresponding to the second surface and the second magnetic field device is positioned outside of the arc chamber in a position corresponding to the third surface;

a gas discharge device injecting a predetermined gas into the arc chamber;

an electrode, positioned opposite to the slit, supplied with a second voltage from a voltage source, and generating an electric field in the arc chamber, wherein the second voltage has a higher voltage than the first voltage, wherein the electrode is provided on the fourth surface; and

a synchronization control unit temporally synchronizing output signals of the current source to supply current to the first and second magnetic field devices and output signals of the voltage source to supply second voltage to the electrode for ion extraction.