Longitudinal gradient undulator with adjustable polarization direction and terahertz light source adopting longitudinal gradient undulator

A technology of polarization direction and terahertz radiation source, which is applied in the field of terahertz science, can solve the problems of enhancing radiation intensity and disadvantages, and achieve the effect of continuous adjustment of polarization direction and stable polarization direction

Pending Publication Date: 2020-04-28
UNIV OF SCI & TECH OF CHINA
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Problems solved by technology

This effect is detrimental to the enhanced radiation intensity for conventional free-electron lasers

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  • Longitudinal gradient undulator with adjustable polarization direction and terahertz light source adopting longitudinal gradient undulator
  • Longitudinal gradient undulator with adjustable polarization direction and terahertz light source adopting longitudinal gradient undulator
  • Longitudinal gradient undulator with adjustable polarization direction and terahertz light source adopting longitudinal gradient undulator

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Embodiment

[0035] Such as figure 1 Shown is a structural schematic diagram of the longitudinal gradient undulator with adjustable polarization direction of the present invention. In this embodiment, the permanent magnet material is neodymium iron boron (Nd-Fe-B, remanence is Br=1T), and the polarization direction of each magnetic block is as follows figure 1 As shown by the arrows in , the magnetization conditions of the two adjacent columns above are the same, and the magnetization conditions of the two adjacent columns below are also the same.

[0036] In this embodiment, the magnetic block width w=40mm, the magnetic block height h=20mm, and the magnetic block length l=10mm (four blocks are an undulator period length λ u =40mm), and there are fringe field shim magnetic blocks with length l=5mm on both sides of the undulator. The interval between the upper and lower magnetic block arrays is variable, and the interval of the first undulator cycle is g=20mm. Every subsequent cycle, the...

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Abstract

The invention discloses a longitudinal gradient undulator which comprises N columns of permanent magnet block arrays located on the upper side and the lower side of an electron passage. Each column ofpermanent magnet block array comprises a certain number of permanent magnet blocks arranged in the regular magnetic field direction to form a plurality of magnetic field periods, the gap of each magnetic field period changes according to a certain rule, and thus the polarization direction of the longitudinal gradient undulator can be adjusted. The polarization direction of the ultra-short pulse terahertz free electron laser source generated based on the longitudinal gradient undulator is controlled, and the polarization direction of the longitudinal gradient undulator can be continuously adjusted.

Description

technical field [0001] The invention relates to the field of terahertz science and technology, in particular to a longitudinal gradient undulator with adjustable polarization direction and a terahertz light source using the same. Background technique [0002] Terahertz (THz) waves refer to electromagnetic waves with a frequency between 0.1-30THz, which have broad application prospects in many fields such as physics, life science, material science, imaging technology, communication technology, and national security. of general concern. [0003] The generation methods of terahertz light sources mainly include several categories: electronic methods, vacuum electronic methods, optical methods, and methods based on accelerator technology. At present, only light sources based on accelerator technology can completely cover the terahertz band, and have the characteristics of high power, strong field, and continuous tunability. [0004] The electron accelerator-based terahertz radi...

Claims

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Application Information

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IPC IPC(8): G21K1/16H01S3/09
CPCG21K1/16H01S3/0903
Inventor 何志刚张浩然
Owner UNIV OF SCI & TECH OF CHINA
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