Patent ID: 9074283
Filing Date: 2015-07-07
Classification: C23C,G02B,H01J

Abstract:
1. An ion gun system, comprising: an ion gun configured to radiate an ion beam on an object; an electric power supply unit configured to supply electric power to the ion gun; a plurality of mass flow regulators configured to introduce a plurality of types of gas into the ion gun; an ion gun control unit configured to control the electric power supplied to the ion gun from the electric power supply unit; and a mass flow control unit configured to control flow rates of the plurality of types of gas introduced into the ion gun from the plurality of mass flow regulators, wherein the mass flow control unit is configured to: wherein the ion gun control unit is configured to change from first acceleration set values indicating target acceleration current value and target acceleration voltage value supplied to the ion gun during the first prescribed processing to second acceleration set values indicating target acceleration current value and target acceleration voltage value supplied to the ion gun during the second prescribed processing by changing each of the acceleration current value and the acceleration voltage value stepwise within a range of stable operation of the ion gun, wherein at least one of the change by the ion gun control unit of the acceleration set values and the change by the mass flow control unit of the flow rate set values is executed so that the set values are changed separately per a divided unit time determined by dividing a total change time for the set values, so as to change the set values stepwise within the total change time, and wherein the divided unit time is set to be a time period equal to or less than 1 second.