Low‐energy high‐intensity extraction system for CHORDIS
Low‐energy high‐intensity extraction system for CHORDIS
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DOI：
10.1063/1.1142804
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发表时间：
1992-04
影响因子：
1.6
通讯作者：
K. Tinschert;W. Zhao
中科院分区：
文献类型：
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作者：
K. Tinschert;W. Zhao
高电流离子源CHORDIS在GSI 300 kV加速器上工作，典型提取电压为40 kV。将离子束注入300 kV加速隙中，不进行质量和电荷分析。为了获得离子注入应用所需的分离良好的离子束，打算使用紧凑的90°偶极磁铁（磁刚度0.2 Tm）在高压平台上进行离子分离。为了分析重离子（质量/电荷≤132），离子能量必须降低到15kev，同时在低发射度下保持足够的束流以使束流与加速间隙匹配。研制了一种高加速电压和高减速电压相结合的单孔径加速-减速提取系统，以获得低离子能量。利用axcel - gsi代码对电极的形状和距离进行了计算机模拟优化。用Ar -和Xe -离子束进行了离子流和光束发射率的测量，并与计算结果进行了比较。
The high current ion source CHORDIS is operated at the GSI 300 kV accelerator with a typical extraction voltage of 40 kV. The ion beam is injected into the 300 kV accelerating gap without mass or charge analysis. To obtain a beam of well‐separated ion species that is desirable for ion implantation applications it is intended to use a compact 90° dipole magnet (magnetic rigidity 0.2 Tm) for ion separation on the HV platform. To analyze heavy ions (mass/charge≤132) the ion energy must be decreased to 15 keV while keeping sufficient beam current at low emittance for beam matching to the accelerating gap. A single aperture accel‐decel extraction system was developed that combines a high accelerating voltage with a high decelerating voltage to obtain the low ion energy. Shaping and distances of the electrodes have been optimized by computer simulation with the axcel‐gsi code. Measurements of ion currents and beam emittances have been performed with Ar‐ and Xe‐ion beams and compared to the results of the comput...