Skew Quadrupole Effect of Laser Plasma Electron Beam Transport

Driss Oumbarek Espinos, Amin Ghaith, Thomas Andre, Charles Kitegi, Mourad Sebdaoui, Alexandre Loulergue, Fabrice Marteau, Frederic Blache, Mathieu Valleau, Marie Labat, Alain Lestrade, Eleonore Roussel, Cedric Thaury, Sebastien Corde, Guillaume Lambert, Olena Kononenko, Jean-Philippe Goddet, Amar Tafzi, Victor Malka, Marie-Emmanuelle Couprie

Research output: Contribution to journalArticlepeer-review


Laser plasma acceleration (LPA) capable of providing femtosecond and GeV electron beams in cm scale distances brings a high interest for different applications, such as free electron laser and future colliders. Nevertheless, LPA high divergence and energy spread require an initial strong focus to mitigate the chromatic effects. The reliability, in particular with the pointing fluctuations, sets a real challenge for the control of the dispersion along the electron beam transport. We examine here how the magnetic defects of the first strong quadrupoles, in particular, the skew terms, can affect the brightness of the transported electron beam, in the case of the COXINEL transport line, designed for manipulating the electron beam properties for a free electron laser application. We also show that the higher the initial beam divergence, the larger the degradation. Experimentally, after having implemented a beam pointing alignment compensation method enabling us to adjust the position and dispersion independently, we demonstrate that the presence of non-negligible skew quadrupolar components induces a transversal spread and tilt of the beam, leading to an emittance growth and brightness reduction. We are able to reproduce the measurements with beam transport simulations using the measured electron beam parameters.

Original languageEnglish
Article number2447
Number of pages21
JournalApplied sciences-Basel
Issue number12
StatePublished - 14 Jun 2019

All Science Journal Classification (ASJC) codes

  • General Engineering
  • Instrumentation
  • Fluid Flow and Transfer Processes
  • Process Chemistry and Technology
  • General Materials Science
  • Computer Science Applications


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