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公开(公告)号:EP1820257A2
公开(公告)日:2007-08-22
申请号:EP05762156.7
申请日:2005-07-22
发明人: MILLER, Rodney
IPC分类号: H02N11/00
摘要: The invention provides a device for producing and focussing an electron beam; the device comprising an evacuated chamber (4), a source of electrons (2), a target (6), means for creating an electric field to accelerate a stream of the electrons constituting the electron beam through the chamber towards the target, and means (12) for providing a magnetic field crossing the electron beam; characterised in that the magnetic flux of the magnetic field progressively reduces in the direction of the target.