Quadrupoles design and measurement for a compact THz FEL
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摘要: 基于自由电子激光（FEL）的太赫兹源具有高功率、高效率、波谱范围宽且连续可调、波束质量好等显著优点，目前是获得最高输出功率的方法。紧凑型太赫兹源使整体装置小型化，减少了装置成本和占用空间，但依然可以提供高功率、高品质的太赫兹波束，是一种便利可靠的用户装置。由于空间限制，FEL上的磁铁要尽可能地减小其尺寸，并仍能满足束流参数设计要求。本文设计的四极磁铁磁轭孔径与有效长度，其中2块是64 mm100 mm，另外3块是45 mm100 mm。这些四极磁铁的磁场梯度可以达到0.6~1.9 Tm-1。采用Poisson和Oprra-3D软件进行四极磁铁的二维和三维仿真计算，设计优化四极磁铁的结构，并测量了加工完成后的四极磁铁的磁场。Abstract: The THz source based on free-electron laser (FEL) has many remarkable performance, such as tunability, high power, high efficiency and flexible picosecond-pulse time structure of coherent radiation. A low-cost, compact FEL facility can also be built on THz region to provide monochromatic, tunable, high power and high quality radiation. Due to the space limitation, the quadrupole magnets on the FEL should reduce their size as much as possible while meeting the performance requirement. The size of the magnetic yokes aperture and length are 64 mm100 mm for two quadrupoles, and 45 mm100 mm for the other three. The quadrupole magnets magnetic field gradient can reach 0.6-1.9 Tm-1. The Poisson codes and Opera-3D codes have been used to calculate the magnetic field. This paper presents the design, analysis and measurement procedure of the magnets.
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Key words:
- THz source /
- FEL /
- quadrupole magnets /
- magnetic field measurement
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