Method and device for generating higher harmonics on circular polarization axis based on undulator radiation

By setting up an electromagnetic coil in the circular polarization waveform to generate a modulated magnetic field, the problem of high-order harmonic radiation flux distributed on the off-axis is solved, and the distribution of high-order harmonic flux on the axis is achieved, and the photon energy range and flux of circular polarization radiation are expanded.

CN119697857AActive Publication Date: 2025-03-25UNIV OF SCI & TECH OF CHINA
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Patent Information

Application Number
CN202411607390.9
Authority / Receiving Office
CN · China
Patent Type
Applications(China)
Current Assignee / Owner
Filing Date
2024-11-12
Publication Date
2025-03-25
Estimated Expiration
2044-11-12

AI Technical Summary

Technical Problem

In the prior art, the high-order harmonic radiation flux generated by the circular polarization waveform is mainly distributed on the ring on the off-axis, resulting in almost no flux distribution on the axis, limiting the photon energy range of the circular polarization radiation.

Method used

By setting multiple electromagnetic coils between the magnetic block of the circular polarization waver and the electron beam vacuum tube, the electromagnetic coil is used to generate a weak period modulated magnetic field, and the magnetic field of the waver is regulated to achieve an on-axis distribution of the high-order harmonic flux.

Benefits of technology

Moving the high-order harmonic flux distribution of the circularly polarized waveformer radiation from the off-axis to the axis enables a large expansion of the photon energy range that the waveformer can cover without changing the beamline design, thereby increasing the photon flux.

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Abstract

The invention discloses a method and device for generating on-axis higher harmonics of circularly polarized radiation based on an undulator, and belongs to the field of synchrotron radiation and undulators. The method comprises the steps of 1, arranging a plurality of electromagnetic coils between a magnetic block of the circular polarization undulator and an electron beam vacuum tube, and 2, when the circular polarization undulator works, introducing currents with the same magnitude into all the electromagnetic coils, and enabling the polarities of the currents in the transversely adjacent electromagnetic coils to be different, a periodic additional magnetic field is generated on a central shaft of the circular polarization undulator through the electromagnetic effect of each electromagnetic coil, and higher harmonic radiation can be received on the shaft. According to the undulator, the flux of the obtainable circularly polarized radiation higher harmonics can be greatly enhanced on a shaft, and the higher harmonics of a certain specific order can be enhanced in a targeted manner, so that the coverage range of circularly polarized radiation photon energy of the undulator is greatly expanded under the condition that subsequent beam line transformation is not carried out, and the undulator has a wide application prospect. And the user experiment efficiency and the overall performance of the device are improved.
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