Patent ID: 6903348

Claim:
An ion implanting system comprising: an x-axis rotating part for rotating a main surface of a wafer holder about an x-axis; a y-axis rotating part for rotating the main surface of the wafer holder about a y-axis; a first angle measuring device structured to be moved along with the main surface of the wafer holder, the first angle measuring device for measuring a tilt angle with respect to the x-axis of the main surface of the wafer holder, the first angle measuring device comprising: a first faraday cup having a slot and a beam sensing region corresponding to the slot, the first faraday cup mounted on the x-axis rotating part at an angle that is offset by an amount equal to a target tilt angle, from a line perpendicular to the main surface of the wafer, a first meter for measuring an amount of current provided to the beam sensing region, the current in the beam sensing region for controlling and neutralizing secondary electrons generated by collisions of an ion beam with the beam sensing region of first faraday cup; a second angle measuring device structured to be moved along with the main surface of the wafer holder, the second angle measuring device for measuring a rotation angle with respect to the y-axis of the main surface of the wafer holder; and a controller coupled to the first angle measuring device and the second angle measuring device, the controller structured to, when the measured tilt and measured rotation angles are different from the target tilt angle and a target rotation angle, control the x- and y-axis rotating parts until the measured tilt and measured rotation angles are equal to the target tilt and target rotation angles.