Denki Kagaku Kogyo Kabushiki Kaisha

Shinpei Hirokawa

Yoshinori Terui

Katsuyoshi Tsunoda

An electron gun includes an electron emission cathode, a control electrode, and an extractor and the electron emission cathode is made of rare earth hexaboride. A tip of the electron emission cathode is located between the control electrode and the extractor, and the electron emission surface of the electron emission cathode is spherical or flat.

Electron gun and a method for using the same

A gallium ion source including a needle electrode, a reservoir for storing gallium, and a wire heater for heating the needle electrode and the reservoir. The needle electrode, the reservoir and the gallium stored in the reservoir have total heat capacity of not less than 0.015 J/K and not higher than 0.1 J/K. The needle electrode and reservoir of the gallium ion source may have a total heat capacity of 0.015 J/K to 0.1K and the initial amount of gallium is 0.004-0.10 g, The wire heater may have a diameter of 0.10-0.20 mm and a length of 8-30 mm, and may be in a V shape with a bend angle of 40&deg;-90&deg;.

Growing community of inventors

Gunma, Japan

Shinpei Hirokawa