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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The significance of using a harmonic magnetic field in SFC (Sector Focusing Cyclotron) and the requirements for the harmonic power supplies are described roughly.

简要描述了扇聚焦回旋加速器（SFC）中使用谐波场的意义和对谐波电源的要求。

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We discussed the stability of both radial movement and axis movement of charged particle in infirm focusing magnetic field and obtained the term of stability.

我们探讨了弱聚焦磁场中带电粒子轴向和径向运动的稳定性问题，得到稳定性条件。

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