When an electron bunch passes through a conducting foil, its self-fields are reflected at the foil surface, also known as Near-Field Coherent Transition Radiation (NF-CTR) resulting in a focusing effect for the electron beam. Passing through multiple foils may allow to focus the electron beam down to solid densities and generate collimated gamma-rays with micrometer source sizes and conversion efficiencies exceeding 10% [Sampath et al., PRL 126, 064801 (2021)]. The possibility offered by this scheme to self-focus high-energy beams and generate extremely dense gamma-ray beams calls for an experimental demonstration.
For the first time we show experimental results of this very strong focusing effect on the electron beam passing through a “multi-foil” target. The unprecedented beam parameters available at the FACET-II accelerator facility allows for high statistics data taking and high precision measurements. We show the experimental results of the beam focusing effect when varying the number of foils, the beam waist position, looking at the beam size and divergence and comparing with PIC simulations of realistic electron beam passing through the multifoil target. Eventually we present the first experimental results of this new focusing process using a laser-plasma accelerated electron beam at the APOLLON laser facility.
A. Sampath
(Max-Planck-Institut für Kernphysik, Heidelberg, Germany)
Agostino Marinelli
(SLAC National Accelerator Laboratory)
Alexander Knetsch
(SLAC National Accelerator Laboratory)
Brendan O'Shea
(SLAC National Accelerator Laboratory)
C. H. Keitel
(Max-Planck-Institut für Kernphysik, Heidelberg, Germany)
C. Zhang
(University of California, Los Angeles, USA)
Chandrashekhar Joshi
(UCLA)
Christopher Doss
(University of Colorado Boulder)
Claudio Emma
(SLAC National Accelerator Laboratory)
D. Storey
(SLAC National Accelerator Laboratory, Menlo Park, USA)
Elias Gerstmayr
(Imperial College London)
Erik Adli
(University of Oslo, Norway)
F. Fiuza
(SLAC National Accelerator Laboratory, Menlo Park, USA)
Henrik Ekerfelt
(Lund University)
Igor Andriyash
(Laboratoire d’Optique Appliquee)
J. Cary
(University of Colorado Boulder, Boulder, USA)
J. Peterson
(SLAC National Accelerator Laboratory, Menlo Park, USA)
J. Yan
(Stone Brook University, New York, USA)
Jerome Faure
(Laboratoire d'Optique Appliquée)
K. Marsh
(University of California, Los Angeles, USA)
Keenan Hunt-Stone
L. Gremillet
(CEA, DAM, DIF, Arpajon, France)
M. Tamburini
(Max-Planck-Institut für Kernphysik, Heidelberg, Germany)
Mark Hogan
(SLAC National Accelerator Laboratory)
Max GILLJOHANN
(Laboratoire d'Optique Appliquée, Ecole Polytechnique, France)
Michael Litos
(University of Colorado Boulder)
N. Nambu
(University of California, Los Angeles, USA)
N. Vafaei-Najafabadi
(Stone Brook University, New York, USA)
O. Konomenko
(LOA, Palaiseau, France)
Pablo San Miguel
(Ecole Polytechnique)
Mr
R. Ariniello
(University of Colorado Boulder, Boulder, USA)
S. Montefiori
(Max-Planck-Institut für Kernphysik, Heidelberg, Germany)
S. Passalidis
(CEA, DAM, DIF, Arpajon, France)
Spencer Gessner
(SLAC)
Sébastien Corde
(Ecole Polytechnique)
Valentina Lee
(University of Colorado, Boulder)
Viktoriia Zakharova
Vitaly Yakimenko
(SLAC)
W. Mori
(University of California, Los Angeles, USA)
X. Xu
(SLAC National Accelerator Laboratory, Menlo Park, USA)
Xavier Davoine
(CEA DAM DIF)
Y. Wu
(University of California, Los Angeles, USA)
Yuliia Mankovska
(Laboratoire d'Optique Appliquee, ENSTA, Ecole Polytechnique de Paris, IP Paris)
Z. Nie
(University of California, Los Angeles, USA)
There are no materials yet.
