直接引出负离子的永磁PIG离子源

Direct Extracting Negative Ions From PIG Ion Sources with Permanent Magent

介绍了两种引出负离子的永磁ＰＩＧ离子，它们可用于直接引出电子亲合势较大元素的负离子，如Ｈ、Ｃ、Ｏ、Ｆ等负离子．当两者均要用ＬａＢ６阴极，在饱和引出电压下，永磁边引出ＰＩＧ源可获得Ｏ－离子１３０μＡ、Ｆ－离子７５μＡ，功率消耗分别为１１０Ｗ和２８０Ｗ．永磁端引出ＰＩＧ源可引出Ｈ－离子５０μＡ，Ｏ－和Ｆ－离子１～２ｍＡ，而功耗仅分别约为４０。

Two kinds of permanent magnet PIG ion sources are introduced, which can be used for direct extracting negative ions of the elements with larger elctron affinity, such as H, C, O, F etc. By using LaB 6 cathodes and at saturation extraction voltage, 130 μA of O - and 75 μA of F - ions were extracted from the side extraction PIG ion source, its power consumption is 110 and 280W, respectively, and for end extraction PIG ion source, 50μA of H -, 1～2mA of O - and F - ion beam have been delivered and the power consumption is only 40,50 and 100W, respectively.