公开(公告)号：US3731211A

公开(公告)日：1973-05-01

申请号：US3731211D

申请日：1969-09-29

Applicant: RADIATION DYNAMICS

Inventor： PURSER K

IPC: H01J5/06 ,  H05H5/02 ,  H01J23/00 ,  H01J23/34 ,  H05H7/00

CPC classification number: H01J5/06 ,  H05H5/02

Abstract: Improved focusing of a beam of charged particles is achieved in an acceleration tube comprising alternate insulating rings and apertured electrodes to which progressively increasing electric potentials are applied to create an electric field for accelerating the charged particles along the length of the tube. In order to achieve precise beam focusing for different electric field strengths the aperture of the grounded electrode at the tube entrance is covered with a grid-like structure and a variable control voltage is applied to a downstream control electrode. For different field strengths the control voltage is adjusted to modify the field between the grounded and control electrodes to provide a variable lens effect. A preferred embodiment employs a variable resistor connected between the grounded and control electrodes to provide the variable control voltage.

Abstract translation: 在包括交替的绝缘环和有孔电极的加速管中实现改进的带电粒子束的聚焦，逐渐增加的电势被施加到该电极上以产生用于沿着管的长度加速带电粒子的电场。 为了实现针对不同电场强度的精确的光束聚焦，管入口处的接地电极的孔被栅格状结构覆盖，并且可变的控制电压被施加到下游控制电极。 对于不同的场强，调节控制电压以修改接地和控制电极之间的场，以提供可变的透镜效应。 优选实施例采用连接在接地和控制电极之间的可变电阻器来提供可变控制电压。