In this paper, we address the energy spread and slice energy spread of an externally injected electron beam in plasma wakefield accelerators operating in the linear or quasilinear regime. The energy spread is first derived taking into account the phase dependence of the wakefield along the finite-length bunch together with the dephasing during acceleration and found to be strongly dependent on the bunch length. This could be compensated by the beam loading effect, the energy spread from which is then derived and found to be nearly independent of the bunch length. However, the transverse dependence of the beam loading effect also makes the particles at the same longitudinal position experience different accelerating fields, introducing a significant slice energy spread. To estimate the slice energy spread, a theoretical analysis was conducted by taking the transverse betatron motion into account. As a study case, 3D simulations for the 5 GeV laser-plasma acceleration stage of the European Plasma Research Accelerator with eXcellence in Applications project have been performed. Careful optimization of the parameters allows one to obtain an energy spread of ≤1% and a slice energy spread of ≤0.1%, with good agreement between theories and simulations.

Design, realization, and high power test of high gradient, high repetition rate brazing-free S -band photogun / Alesini, David; Battisti, Antonio; Bellaveglia, Marco; Cardelli, Fabio; Falone, Antonio; Gallo, Alessandro; Lollo, Valerio; Thomas Palmer, Dennis; Pellegrino, Luigi; Piersanti, Luca; Pioli, Stefano; Variola, Alessandro; Pettinacci, Valerio; Palumbo, Luigi. - In: PHYSICAL REVIEW. ACCELERATORS AND BEAMS. - ISSN 2469-9888. - (2018).

Design, realization, and high power test of high gradient, high repetition rate brazing-free S -band photogun

Fabio Cardelli;Alessandro Gallo;Luca Piersanti;Stefano Pioli;Valerio Pettinacci;Luigi Palumbo
2018

Abstract

In this paper, we address the energy spread and slice energy spread of an externally injected electron beam in plasma wakefield accelerators operating in the linear or quasilinear regime. The energy spread is first derived taking into account the phase dependence of the wakefield along the finite-length bunch together with the dephasing during acceleration and found to be strongly dependent on the bunch length. This could be compensated by the beam loading effect, the energy spread from which is then derived and found to be nearly independent of the bunch length. However, the transverse dependence of the beam loading effect also makes the particles at the same longitudinal position experience different accelerating fields, introducing a significant slice energy spread. To estimate the slice energy spread, a theoretical analysis was conducted by taking the transverse betatron motion into account. As a study case, 3D simulations for the 5 GeV laser-plasma acceleration stage of the European Plasma Research Accelerator with eXcellence in Applications project have been performed. Careful optimization of the parameters allows one to obtain an energy spread of ≤1% and a slice energy spread of ≤0.1%, with good agreement between theories and simulations.
Radio frequency ; Room temperature ; RF Accelerators & Beams
01 Pubblicazione su rivista::01a Articolo in rivista
Design, realization, and high power test of high gradient, high repetition rate brazing-free S -band photogun / Alesini, David; Battisti, Antonio; Bellaveglia, Marco; Cardelli, Fabio; Falone, Antonio; Gallo, Alessandro; Lollo, Valerio; Thomas Palmer, Dennis; Pellegrino, Luigi; Piersanti, Luca; Pioli, Stefano; Variola, Alessandro; Pettinacci, Valerio; Palumbo, Luigi. - In: PHYSICAL REVIEW. ACCELERATORS AND BEAMS. - ISSN 2469-9888. - (2018).
File allegati a questo prodotto
File Dimensione Formato  
Alesini_Design_2018.pdf

accesso aperto

Tipologia: Versione editoriale (versione pubblicata con il layout dell'editore)
Licenza: Tutti i diritti riservati (All rights reserved)
Dimensione 9.58 MB
Formato Adobe PDF
9.58 MB Adobe PDF Visualizza/Apri PDF

I documenti in IRIS sono protetti da copyright e tutti i diritti sono riservati, salvo diversa indicazione.

Utilizza questo identificativo per citare o creare un link a questo documento: https://hdl.handle.net/11573/1468645
Citazioni
  • ???jsp.display-item.citation.pmc??? ND
  • Scopus 5
  • ???jsp.display-item.citation.isi??? 5
social impact