自由电子激光非旋转对称效应的二维数值模拟
A 2D-FEL CODE WITHOUT ROTATIONAL SYMMETRY
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摘要: 建立了电子摇摆运动方向为无限延伸的非旋转对称的二维FEL数值模拟程序。利用该程序计算了在电子束非理想入射条件下的光场演化。结果表明无论是电子束的中心偏移或束轴倾斜,都将导致输出光功率的指数下降,并激发高阶光横模,光束重心偏移。除发射度外,电子束横向相空间的几何也是FEL运行质量及影响光功率的重要参数。Abstract: A 2D-FEL code with geometry infinitely extended in direction of electron wiggling motion is established. Using this code, the evolution of optical field is calculated under the conditions of nonideal incidence of e-beam, which results in exponential degradation in output power and the excitation of transverse higher modes, as well as in displacement of the centroid of optical beam. In this paper, it is pointed out that, beside the emittance of e-beam, the geometry of transverse phase space is also an important parameter having influence on FEL performance.
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Key words:
- non- rotational symmetry /
- nonideal incidence /
- geometry of phase space
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