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Free electron laser terahertz radiation source based on higher harmonic wave generation method

A terahertz radiation source and high-order harmonic technology, which is applied in the field of vacuum electronics and electron accelerators, can solve the problems of restricting large-scale promotion, difficult to achieve current intensity in technology, and inability to continuously emit.

Active Publication Date: 2016-06-29
UNIV OF SCI & TECH OF CHINA
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Problems solved by technology

The 410 kV electron gun has a very large power supply system, and can only work in pulse mode, and cannot emit continuously. At the same time, the current intensity of 150 amperes is also technically difficult to achieve.
Therefore, this contradiction has also become the main factor limiting the large-scale promotion of this technology.

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  • Free electron laser terahertz radiation source based on higher harmonic wave generation method
  • Free electron laser terahertz radiation source based on higher harmonic wave generation method
  • Free electron laser terahertz radiation source based on higher harmonic wave generation method

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specific Embodiment

[0035] attached figure 1 A cross-sectional schematic diagram of the scheme. The electron gun 101 provides an electron source for radiation generation, and the cathode 102 is used to emit electrons; the focusing electrode 103 and the cathode 102 are at the same potential, and -120kV high voltage is applied between the cathode 102 and the anode 104 to accelerate electron energy to 120keV. The electrons enter the dielectric waveguide 105 to generate THz radiation, and the magnetic field generated by the solenoid coil 106 is used to constrain the size of the electron beam. The radiator takes a dielectric waveguide as an example. The dielectric waveguide 105 is a columnar dielectric with a metal film on its surface, and its material is aluminum oxide (relative permittivity is 9.8). It should be noted that other dielectric materials can also be used.

[0036] attached figure 2 The dispersion diagrams of the first five modes (TM01, TM02, TM03, TM04, TM05) and the electron lines wi...

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Abstract

The invention discloses a free electron laser terahertz radiation source based on a higher harmonic wave generation method. The radiation source comprises an electron gun, a radiator and a solenoid magnet. The electron gun is connected with a vacuum pipeline. The radiator is arranged in the interior of the vacuum pipeline. The solenoid magnet wraps the exterior of the vacuum pipeline. There are different modes from a base mode to a higher mode in the radiator and the different modes correspond to different radiation frequencies. By selecting parameters and electron energy of the radiator, the frequency of the higher mode of the radiator is allowed to be integral multiple of that of the base mode, i.e., the harmonic wave of the base mode frequency. By use of a harmonic wave increasing method in which the frequency of the higher mode of the radiator is integral multiple of that of the base mode, a high-power and high-frequency THz radiation source can be generated by use of an electron beam which less requires parameters and by use of a large-size waveguide.

Description

technical field [0001] The invention relates to an electron accelerator and vacuum electronics technology, in particular to a free electron laser terahertz radiation source based on a high-order harmonic generation method. Background technique [0002] Terahertz waves refer to electromagnetic waves with a frequency between 0.1-30THz. Since the existing light source has not completely covered this frequency band, it is called THz gap (gap). Because of its broad application prospects in many fields such as life science, material science, communication technology and national security, it has attracted widespread attention from scientists at home and abroad. The THz source is the basis for the development of THz science, and it is also the main bottleneck for the development of related disciplines. [0003] To fill the so-called "THz gap", researchers in the fields of accelerators, lasers, and vacuum electronics have made many contributions. THz radiation sources based on ele...

Claims

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Application Information

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IPC IPC(8): H01S1/00
CPCH01S1/00
Inventor 何志刚陆亚林李伟伟贾启卡王琳
Owner UNIV OF SCI & TECH OF CHINA
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