正An external multi-cusp ion source and an axial injection line are used in CYCIAE-100 cyclotron for extracting and transporting H- beam. The beam is transported by the injection line and bended by a spiralinflector to the median plane of the machine, and begins to be accelerated by Dee voltage. The total length of the injection line and the ion source is 2 781 mm. The injection line is composed of a big vacuum
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