A high-precision electromagnetic undulator has been developed for a compact FIR free-electron laser (FEL) driven by a magnetron-based microtron. Permanent magnets are placed between iron poles to compensate for the high-flux magnetic field generated by the main coils. The period of the undulator is 25 mm and the number of periods is 80. We can change the K-parameter from 1 to 1.6 (B-w = 4.5-6.8 kG at a fixed gap of 5.6 mm) in order to cover the FEL wavelength range from 100 to 300 mum at an electron energy of 6.5-4 MeV. The undulator has a modular structure of iron poles and a novel correction scheme of field distribution to improve significantly the accuracy of the field distribution. The r.m.s. deviation of the field distribution was improved from 0.2 to 0.05 with the correction method. The undulator shows considerable advantages in performance, compactness, cost effectiveness, and simplicity in manufacturing and construction. (C) 2002 Elsevier Science B.V. All rights reserved. References: 5
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机译：已经开发了一种高精度电磁波荡器，用于由基于磁控管的微电子驱动的紧凑型FIR自由电子激光器（FEL）。永磁体放置在铁极之间，以补偿主线圈产生的高通量磁场。波荡器的周期为25毫米，周期数为80。我们可以将 K 参数从 1 更改为 1.6（在 5.6 mm 的固定间隙下，B-w = 4.5-6.8 kG），以便在 6.5-4 MeV 的电子能量下覆盖 100 到 300 mum 的 FEL 波长范围。该波荡器采用铁杆模块化结构，新颖的场分布校正方案，显著提高了场分布的精度。使用校正方法将场分布的均方根偏差从0.2%提高到0.05%。该波荡器在制造和施工的性能、紧凑性、成本效益和简单性方面具有相当大的优势。（C） 2002 Elsevier Science B.V.保留所有权利。[参考资料： 5]
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