Patent ID: 6661165
Filing Date: 2003-12-09
Classification: H01J

Abstract:
An inductively coupled high-frequency electron source comprising:a plasma chamber open at least at a first end wherein a total surface of an open region of the plasma chamber is defined as A0, the plasma chamber having a gas inlet for a gas to be ionized and a high-frequency coil, wherein an interior wall of the plasma chamber is formed at least partially by conductive regions which are connected with a current source, a total surface of the conductive regions defined as Ac and a ratio of the surface amounts A0 and Ac being maximally A0Ac=2&it;Ï€&it;â€ƒ&it;mee&it;â€ƒ&it;m0whereinm0 =mass of an ion of the gas to be ionized andme =mass of an electrone =Eulerian number.