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A tunable electron beam source using trapping of electrons in a density down-ramp in laser wakefield acceleration

Ekerfelt, Henrik LU ; Hansson, Martin LU ; Gallardo González, Isabel LU ; Davoine, Xavier and Lundh, Olle LU (2017) In Scientific Reports 7(1).
Abstract

One challenge in the development of laser wakefield accelerators is to demonstrate sufficient control and reproducibility of the parameters of the generated bunches of accelerated electrons. Here we report on a numerical study, where we demonstrate that trapping using density down-ramps allows for tuning of several electron bunch parameters by varying the properties of the density down-ramp. We show that the electron bunch length is determined by the difference in density before and after the ramp. Furthermore, the transverse emittance of the bunch is controlled by the steepness of the ramp. Finally, the amount of trapped charge depends both on the density difference and on the steepness of the ramp. We emphasize that both parameters of... (More)

One challenge in the development of laser wakefield accelerators is to demonstrate sufficient control and reproducibility of the parameters of the generated bunches of accelerated electrons. Here we report on a numerical study, where we demonstrate that trapping using density down-ramps allows for tuning of several electron bunch parameters by varying the properties of the density down-ramp. We show that the electron bunch length is determined by the difference in density before and after the ramp. Furthermore, the transverse emittance of the bunch is controlled by the steepness of the ramp. Finally, the amount of trapped charge depends both on the density difference and on the steepness of the ramp. We emphasize that both parameters of the density ramp are feasible to vary experimentally. We therefore conclude that this tunable electron accelerator makes it suitable for a wide range of applications, from those requiring short pulse length and low emittance, such as the free-electron lasers, to those requiring high-charge, large-emittance bunches to maximize betatron X-ray generation.

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author
organization
publishing date
type
Contribution to journal
publication status
published
subject
in
Scientific Reports
volume
7
issue
1
publisher
Nature Publishing Group
external identifiers
  • scopus:85029851661
  • wos:000411648500003
ISSN
2045-2322
DOI
10.1038/s41598-017-12560-8
language
English
LU publication?
yes
id
86f91c0d-bdb5-4dfa-9603-7dfdb06b26ac
date added to LUP
2017-10-05 12:25:54
date last changed
2018-03-04 05:06:04
@article{86f91c0d-bdb5-4dfa-9603-7dfdb06b26ac,
  abstract     = {<p>One challenge in the development of laser wakefield accelerators is to demonstrate sufficient control and reproducibility of the parameters of the generated bunches of accelerated electrons. Here we report on a numerical study, where we demonstrate that trapping using density down-ramps allows for tuning of several electron bunch parameters by varying the properties of the density down-ramp. We show that the electron bunch length is determined by the difference in density before and after the ramp. Furthermore, the transverse emittance of the bunch is controlled by the steepness of the ramp. Finally, the amount of trapped charge depends both on the density difference and on the steepness of the ramp. We emphasize that both parameters of the density ramp are feasible to vary experimentally. We therefore conclude that this tunable electron accelerator makes it suitable for a wide range of applications, from those requiring short pulse length and low emittance, such as the free-electron lasers, to those requiring high-charge, large-emittance bunches to maximize betatron X-ray generation.</p>},
  articleno    = {12229},
  author       = {Ekerfelt, Henrik and Hansson, Martin and Gallardo González, Isabel and Davoine, Xavier and Lundh, Olle},
  issn         = {2045-2322},
  language     = {eng},
  month        = {12},
  number       = {1},
  publisher    = {Nature Publishing Group},
  series       = {Scientific Reports},
  title        = {A tunable electron beam source using trapping of electrons in a density down-ramp in laser wakefield acceleration},
  url          = {http://dx.doi.org/10.1038/s41598-017-12560-8},
  volume       = {7},
  year         = {2017},
}