A vacuum-insulated tandem accelerator, delivering the continuous wave 8 mA, 2 MeV proton beam, is operated regularly at the Budker Institute of Nuclear Physics, where a 10 mA, 25 keV negative ion injector is used. Recently, a new injector with an upgraded negative ion source and beam preacceleration has been developed to increase the tandem accelerated current. The transport line of the new injector is composed of a bending magnet with 90° ion beam turn, an acceleration tube for negative ion acceleration to the energy up to 150 keV, and a 0.6 m long transport section. The H- ion beam production, its acceleration, and transport were studied at a test stand, which is equipped with electrical and optical diagnostics. The data on 14 mA, 133 keV continuous wave negative ion beam production and transport are presented. The undesirable coacceleration of secondary electrons, produced in the acceleration tube, was recorded as well. The coaccelerated electrons' current contributed up to 2% of the total accelerated beam at the operational vacuum in the low energy beam transport. The coaccelerated electrons were removed from the beam with a magnetic filter. The numerical modeling of the beam transport was carried out. A reasonable agreement between the modeled and experimental data was obtained.

中文翻译：

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串联加速器连续波高压负离子束注入器的研制

Budker 核物理研究所定期运行真空绝缘串联加速器，提供 8 mA、2 MeV 连续波质子束，使用 10 mA、25 keV 负离子注入器。最近，开发了一种具有升级的负离子源和束预加速的新型注射器，以增加串联加速电流。新型注射器的传输线由一个90°离子束转向的弯曲磁铁、一个负离子加速到能量高达150 keV的加速管和一个0.6 m长的传输段组成。氢离子束的产生、其加速和传输在配备有电和光诊断装置的试验台上进行了研究。提供了 14 mA、133 keV 连续波负离子束产生和传输的数据。加速管中产生的不希望有的二次电子共加速也被记录下来。在低能束传输中的操作真空下，共加速电子的电流占总加速束的 2%。用磁性过滤器从束中去除共加速的电子。进行了光束传输的数值模拟。获得了建模数据和实验数据之间的合理一致性。