Electro-optic 3D snapshot of a laser wakefield accelerated kilo-ampere electron bunch

Kai Huang; Zhan Jin; Nobuhiko Nakanii; Tomonao Hosokai; Masaki Kando

doi:10.1038/s41377-024-01440-2

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Electro-optic 3D snapshot of a laser wakefield accelerated kilo-ampere electron bunch

Original Articles

- Electro-optic 3D snapshot of a laser wakefield accelerated kilo-ampere electron bunch
- Light: Science & Applications Vol. 13, Issue 5, Pages: 823-834(2024)
- Affiliations：
  
  1.Kansai Institute for Photon Science (KPSI), National Institutes for Quantum Science and Technology (QST), Kyoto, Japan
  2.Laser Accelerator R&D, Innovative Light Sources Division, RIKEN SPring-8 Center, Hyogo, Japan
  3.SANKEN, Osaka University, Osaka, Japan
- Author bio：
  
  Kai Huang (huang.kai@qst.go.jp)
- Funds：
- DOI：10.1038/s41377-024-01440-2
  CLC：
- Received：15 November 2023，
  
  Revised：2024-02-27，
  
  Accepted：25 March 2024，
  
  Published Online：08 April 2024，
  
  Published：31 May 2024
- Accepted：
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Huang, K. et al. Electro-optic 3D snapshot of a laser wakefield accelerated kilo-ampere electron bunch. Light: Science & Applications, 13, 823-834 (2024).
DOI：

Huang, K. et al. Electro-optic 3D snapshot of a laser wakefield accelerated kilo-ampere electron bunch. Light: Science & Applications, 13, 823-834 (2024). DOI： 10.1038/s41377-024-01440-2.

摘要

Abstract

Laser wakefield acceleration

as an advanced accelerator concept

has attracted great attentions for its ultrahigh acceleration gradient and the capability to produce high brightness electron bunches. The three-dimensional (3D) density serves as an evaluation metric for the particle bunch quality and is intrinsically related to the applications of an accelerator. Despite its significance

this parameter has not been experimentally measured in the investigation of laser wakefield acceleration. We report on an electro-optic 3D snapshot of a laser wakefield electron bunch at a position outside the plasma. The 3D shape of the electron bunch was detected by simultaneously performing optical transition radiation imaging and electro-optic sampling. Detailed 3D structures to a few micrometer levels were reconstructed using a genetic algorithm. The electron bunch possessed a transverse size of less than 30 micrometers. The current profile shows a multi-peak structure. The main peak had a duration of

10 fs and a peak current

1 kA. The maximum electron 3D number density was ~ 9 × 10

-3

. This research demonstrates a feasible way of 3D density monitoring on femtosecond kilo-ampere electron bunches

at any position of a beam transport line for relevant applications.

关键词

Keywords

references

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