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    • 40. 发明授权
    • System and method for neutralizing an ion beam using water vapor
    • 使用水蒸汽中和离子束的系统和方法
    • US5814819A
    • 1998-09-29
    • US891688
    • 1997-07-11
    • Frank SinclairVictor BenvenisteJiong Chen
    • Frank SinclairVictor BenvenisteJiong Chen
    • H01J37/317C23C14/48G21K1/14H01J37/02H01J27/02
    • H01J37/026H01J2237/31701
    • An improved ion beam neutralizer (22) is provided for neutralizing the electrical charge of an ion beam (28) output from an extraction aperture (50). The neutralizer comprises a source of water (52); a vaporizer (54) connected to the source of water; a mass flow controller (56) connected to the vaporizer; and an inlet (60) connected to the mass flow controller. The vaporizer (54) converts water from the source (52) from a liquid state to a vapor state. The mass flow controller (56) receives water vapor from the vaporizer (54) and meters the volume of water vapor output by a mass flow controller outlet (66). The inlet (60) is provided with an injection port (68) located proximate the ion beam extraction aperture (50) and receives the metered volume from the outlet (66). The injection port (68) is positioned near the extraction aperture so that the ion beam and the water vapor interact to neutralize the ion beam. The improved ion beam neutralizer (22) is especially effective in low energy (less than ten kilo-electron volts (10 KeV)) beam applications.
    • 提供改进的离子束中和器(22),用于中和从提取孔(50)输出的离子束(28)的电荷。 中和器包括水源(52); 连接到水源的蒸发器(54); 连接到蒸发器的质量流量控制器(56) 以及连接到质量流量控制器的入口(60)。 蒸发器(54)将来自源(52)的水从液态转换为蒸汽状态。 质量流量控制器(56)接收来自蒸发器(54)的水蒸汽并且测量由质量流量控制器出口(66)输出的水蒸汽的体积。 入口(60)设置有靠近离子束提取孔(50)定位并从出口(66)接收计量体积的注射口(68)。 注入口(68)位于提取孔附近,使得离子束和水蒸气相互作用以中和离子束。 改进的离子束中和器(22)在低能量(小于十千伏电压(10KeV)))的应用中特别有效。