The effects of the positive and negative ion background on the discharge path are studied.
用实验方法研究了正、负离子背景对放电路径的影响。
A set of entrance magnets are positioned about an entrance of the scanner and generate a constant entrance magnetic field across the path of the ion beam.
恒定磁场产生器，位于该磁性扫描器的近端处，在该射束路径之中产生磁场，用于减轻零磁场效应；
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