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Method for producing femtosecond megavolt energy electronic beam by using strong laser

A femtosecond megavolt, electron beam technology, applied to electrical components, accelerators, etc., can solve problems such as large divergence angle of electron beams

Inactive Publication Date: 2002-09-04
SHANGHAI INST OF OPTICS & FINE MECHANICS CHINESE ACAD OF SCI
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  • Method for producing femtosecond megavolt energy electronic beam by using strong laser

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Embodiment Construction

[0016] Devices used such as figure 1 shown. Wherein, the pulse width of the ultrafast strong laser beam output by the laser light source 1 is 30 femtoseconds, and the power is greater than 0.3 TW. The focusing mirror 302 in the focusing system 3 is a parabolic reflector, and the ratio F / D=1 of the focal length F=6cm of the parabolic reflector to the diameter D=6cm of the laser beam.

[0017] The tight focusing of the ultra-fast and strong laser on the gas medium 5 is achieved by using parabolic reflective focusing, that is, the aperture D of the laser beam is equal to the focal length F of the focusing mirror 302 . The medium 5 is the gas hydrogen or helium or nitrogen. By adjusting the laser light source or by adjusting the reflector 301 to optimize the laser beam, the beam quality is close to the diffraction limit and the Gaussian beam with a wavelength of 800nm. After being focused by the parabolic reflector, the Rayleigh (Rayleigh) length of the beam is 1 μm. figure 1 T...

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Abstract

A method to use strong laser creating an electron beam in femto second, megavolt energy selects a laser optical source of ultrafast strong laser beam with output impulse width in fly second order andpower in tewatt order. The laser beam will focus the focal point directly on the surface of gas or solid media via focusing system located in a vaccum chamber and the ratio between focal length of focus lens in focusing system and diameter of laser beam is less than 2. Because the focal length of focus lens is short and the focal point is focused directly on the surface of media, the high energy electron bean in collimation with time in femto second order and electron energy in megavolt can be obtained by the physical cources of diffraction, scattering and reflecting of peark-value strength on the laser beam focal spot to decrease peak value of laser beam quickly along the transmitting directino of laser beam, the method is simple and effective comparing with before technique. The electron beam creation and ultrafast strong laser beam creating electron beam is in synchronizatino on time within femto second ordre both.

Description

Technical field: [0001] The invention relates to a method for generating electron beams with femtosecond and megavolt energy by using strong laser, which is mainly used for accelerating electrons with ultrafast strong laser, and generates high-energy electron beams with time width of femtoseconds, energy of megaelectron volts and collimated direction. Such electron beams can be applied to injection sources of high energy accelerators, photocathodes of free electron lasers, generation of ultrafast X-rays and γ-rays, ultrafast electron diffraction, etc. Background technique: [0002] Using the interaction between high-intensity laser and matter, high-energy electron beams with megaelectron-volt energy can be generated. The prior art is mainly realized through three methods. The prior art [1] is to use free electrons to be scattered out of the interaction region by strong laser light to obtain accelerated electrons [see C.I.Moore et al., Physical Review Letters 74(13), 2439(19...

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Application Information

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IPC IPC(8): H05H7/00H05H15/00
Inventor 王晓方汪权东沈百飞
Owner SHANGHAI INST OF OPTICS & FINE MECHANICS CHINESE ACAD OF SCI