Patent ID: 6365905
Filing Date: 2002-04-02
Classification: H01J

Abstract:
A focused ion beam forming apparatus comprising:a vacuum tank; a gas injector for supplying an assist gas to a predetermined region of a surface of a sample, wherein one or more reservoirs supply the assist gas; a device for cooling at least one of the reservoirs; a temperature sensor for measuring a temperature of the reservoir; a temperature controller for controlling the temperature of the reservoirs by a measured value of the temperature sensor; and a valve provided between the reservoirs and the gas injector, the reservoirs having the cooling device and the temperature sensor being packed by a substance having a vapor pressure of higher than 1 Torr at room temperature to control the temperature of the reservoirs to a constant temperature of âˆ’50Â° C. or below thereby controlling an amount of the assist gas to be blown to the predetermined region.