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首页> 外文期刊>Journal of Plasma Physics >Comparative study of electron motion and stability for different focusing regimes in a free-electron laser with three-dimensional helical wiggler
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Comparative study of electron motion and stability for different focusing regimes in a free-electron laser with three-dimensional helical wiggler

机译：具有三维螺旋摆动的自由电子激光器中不同聚焦方式下电子运动和稳定性的比较研究

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摘要

Since the electromagnetic energy gained by the laser wave in a free-electron laser (FEL) is transferred from the kinetic energy loss of a relativistic electron beam, the stability of electron motion is one of the key factors that affect FEL performance In this paper the stability of electron motion is compared for different focusing regimes. It is demonstrated that the natural focusing regime of a three-dimensional wiggler is easily broken by the self-field of the electron beam. The magnetic focusing regime of an axial guide magnetic field is based on the superposition of a strong Larmor rotation on the transverse quiver motion of the electrons, while the electric focusing regime of an ion-channel guiding field generates an electric force to counteract the divergent effect of the beam self-field. In comparison with the magnetic focusing regime of an external magnetic system, the electric focusing regime of an ion-channel guiding field may yield smaller instantaneous Larmor radius and slighter Larmor-centre deviation from the axis and provide better motion stability.
机译：由于自由电子激光器（FEL）中的激光波所获得的电磁能是从相对论电子束的动能损失中转移的，因此电子运动的稳定性是影响FEL性能的关键因素之一。比较了不同聚焦方式下电子运动的稳定性。结果表明，电子束的自电场很容易破坏三维摆动器的自然聚焦状态。轴向引导磁场的磁聚焦机制是基于强大的拉莫尔旋转叠加在电子的横向颤动上，而离子通道引导电场的电聚焦机制会产生一个抵消发散效应的力光束的自场。与外部磁系统的磁聚焦方式相比，离子通道引导场的电聚焦方式可以产生较小的瞬时拉莫尔半径和较小的拉莫尔中心距轴，并提供更好的运动稳定性。

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