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Laser plasma accelerator and method of generating high-quality electron beams

A technology of laser plasma and accelerator, which can be used in DC voltage accelerators, targets for generating nuclear reactions, electrical components, etc., and can solve the problems of large footprint and high cost

Inactive Publication Date: 2014-03-05
SHANGHAI JIAO TONG UNIV
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  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

[0006] The purpose of the present invention is to provide a simple and reliable laser plasma accelerator by optimizing and matching the parameters of the laser and the gas target and simplifying the injection method of the electron beam. Disadvantages of high cost, but also can produce high-quality electron beams in a stable and simple way

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  • Laser plasma accelerator and method of generating high-quality electron beams
  • Laser plasma accelerator and method of generating high-quality electron beams
  • Laser plasma accelerator and method of generating high-quality electron beams

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Embodiment 1

[0059] This embodiment takes figure 1 The laser plasma accelerator device, wherein the laser beam is a fundamental mode Gaussian beam, the pulse width of the laser beam is 33 femtoseconds, the peak power is 39 TW, and the beam waist radius is 11 microns. The gas target is made by mixing helium and nitrogen with a molecular number density ratio of 100:0.15. The laser beam is ejected from a supersonic gas nozzle with a width of 1.5 mm and a gas molecular number density of 2.8×10 18 per cubic centimeter.

[0060] The results obtained by numerical simulation show that the laser plasma accelerator of this embodiment produces a high-quality electron beam, the electric quantity of the electron beam is 14.6 picocoulo, the center energy is 383 MeV, and the half-width full-high energy divergence is 3.33%. The emittance is 3 mm mrad.

[0061] Figure 4 The energy spectrum of the electron beam is shown, indicating that the generated electron beam belongs to the monoenergetic electron b...

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Abstract

The invention provides a laser plasma accelerator and a method of generating high-quality electron beams. Specifically, the laser plasma accelerator provided by the invention comprises laser parameters and gas target parameters, wherein the laser parameters comprise laser light intensity, pulse width and girdling radius; the gas target parameters comprise a gas type, density and mixing proportion. According to the invention, the laser parameters and the gas target parameters are optimized based on a principle that plasma tail field acceleration electron beams are formed when ultra-short laser is transmitted in a low-density gas target, so that high-quality electron beams are obtained on the condition of only using one beam of laser and one gas target, and therefore, high-quality electron beams which are applicable to the fields such as medical treatment, industry and national defense are simply and easily obtained.

Description

technical field [0001] The invention relates to an accelerator, in particular to a laser plasma accelerator for generating high-quality electron beams through strong laser action. Background technique [0002] As an important driving source for X-ray and γ-ray emission, high-energy electron beam has important application value in the fields of industry, medical treatment and national defense. Traditional high-energy electron beams generally come from large-scale linear or circular accelerators. These accelerators are often huge (some even cover hundreds of acres, equivalent to the area of ​​multiple football fields), and at the same time, they are expensive. These unfavorable factors limit their use. Scope and popularity. [0003] The study found that the light intensity reaches or exceeds the relativistic light intensity (10 18 Watts per square centimeter) laser light can excite a plasma wake as it passes through a gas target; this wake can carry certain electrons and acc...

Claims

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Application Information

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IPC IPC(8): H05H6/00
Inventor 曾明盛政明陈民张杰
Owner SHANGHAI JIAO TONG UNIV