There exists on optimal value of magnetic focusing field and beam voltage, which can minimize the ion noise amplitude.

束电流与束电压确定，存在最佳的磁场使离子噪声幅度最小。

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There exists on optimal value of magnetic focusing field and beam voltage, which can minimize the ion noise amplitude.

束电流与束电压确定，存在最佳的磁场使离子噪声幅度最小。

youdao