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Smith-Purcell electromagnetic radiation source based on two rectangular gratings

A technology of electromagnetic radiation source and rectangular grating, which is applied in the direction of the circuit components of the time-of-flight electron tube, the electron/ion gun of the time-of-flight electron tube, the collector of the time-of-flight electron tube, etc., and can solve the problem of radiation intensity drop, etc. problem, to achieve the effect of increasing the radiation frequency

Inactive Publication Date: 2017-08-25
UNIV OF SCI & TECH OF CHINA
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Problems solved by technology

The radiation intensity decreases sharply with the increase of the frequency multiple, therefore, the traditional Smith-Purcell free electron laser can usually only produce electromagnetic radiation with a frequency twice that of the cluster frequency (ie, the second harmonic)

Method used

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  • Smith-Purcell electromagnetic radiation source based on two rectangular gratings
  • Smith-Purcell electromagnetic radiation source based on two rectangular gratings
  • Smith-Purcell electromagnetic radiation source based on two rectangular gratings

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specific Embodiment

[0042] The specific implementation parameters and simulation results of the present invention obtained by optimization are given below. Large-size flat metal rectangular grating: grating period 0.9mm, gap width between grating combs 0.45mm, grating comb depth 0.45mm; small-size flat metal rectangular grating: grating period 0.35mm, gap width between grating combs 0.05mm, grating The depth of the comb teeth is 0.1 mm; the electron beam acceleration voltage is 80 kV, the current density is 50 amperes per square centimeter, and the thickness of the electron beam in the x direction is 0.1 mm. figure 2 It shows that the intensity of the 5th harmonic (frequency 0.491THz) excited by the surface of the small-sized flat metal rectangular grating is stronger than that of the lower harmonics (2, 3, 4th harmonic), indicating that it can excite the frequency with High electromagnetic radiation; image 3 The time-domain diagram of the 5th harmonic radiation electric field in the upper hal...

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Abstract

The invention discloses a Smith-Purcell electromagnetic radiation source based on two rectangular gratings, which comprises an electron gun used for generating a rectangular ribbon-shaped electron beam, a large-size flat metal rectangular grating, a small-size flat metal rectangular grating and a collecting electrode, and is characterized in that the electron gun is opposite to the collecting electrode, the large-size flat metal rectangular grating and the small-size flat metal rectangular grating are sequentially placed between the electron gun and the collecting electrode, and the distance between the upper surface of the large-size flat metal rectangular grating and the rectangular ribbon-shaped electron beam is equal to the distance between the upper surface of the small-size flat metal rectangular grating and the rectangular ribbon-shaped electron beam; the constant-speed rectangular ribbon-shaped electron beam generated by the electron gun skims over the upper surface of the large-size flat metal rectangular grating and the upper surface of the small-size flat metal rectangular grating and finally gets into the collecting electrode. Compared with a traditional Smith-Purcell free electron laser, the Smith-Purcell free electron laser can be enabled to operate at higher harmonic waves, and the radiation frequency is improved by 2-3 times.

Description

technical field [0001] The invention relates to a vacuum electron technology in electromagnetics, in particular to a Smith-Passell electromagnetic radiation source based on two sections of rectangular gratings. Background technique [0002] Electromagnetic waves with millimeter or submillimeter wavelengths and terahertz frequencies have broad application prospects in many fields such as life sciences, material sciences, high-speed communications, and national security. Electromagnetic radiation sources in this band are the basis for the development of terahertz technology. [0003] The existing electromagnetic radiation sources working in this frequency band are either extremely low in power efficiency (such as solid-state sources realized by frequency doubling), or extremely difficult to process (such as traditional vacuum electronics sources), or extremely complex and costly equipment (including based on Optical difference-frequency radiation sources, undulator-based conv...

Claims

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Application Information

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IPC IPC(8): H01J23/027H01J23/06H01J23/20
CPCH01J23/027H01J23/06H01J23/20H01J2223/027H01J2223/06H01J2223/20
Inventor 刘维浩梁林波陆亚林王琳贾启卡
Owner UNIV OF SCI & TECH OF CHINA
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