19–23 Aug 2024
POLIN
Europe/Warsaw timezone

Reduction of the electron beam divergence of laser wakefield-accelerators by integrated plasma lenses

WECI02
21 Aug 2024, 15:00
30m
POLIN

POLIN

Mordechaja Anielewicza 6 00-157 Warszawa Poland
Board: WECI02
Invited Oral Presentation Novel acceleration and FEL concepts Novel acceleration and FEL concepts

Speaker

Dr Arie Irman (Helmholtz Zentrum Dresden Rossendorf)

Description

We report on electron-beam collimation using a passive plasma lens, integrated directly into a laser wakefield-accelerator stage operating in the high-charge regime. The lens is created by the reshaping of the gas-density profile of a supersonic jet at the beam’s exit side. It reduces the beam’s divergence by a factor of 2 to below 1 mrad (rms), while preserving the total charge of 170 pC and maintaining the energy spread. Ultrafast probing of plasma dynamics and Particle-in-Cell (PIC) simulations reveal that the effect is induced by the focusing field of the generated beam-driven wakefield as the remnant laser intensity drops significantly. The resulting spectral-charge density, defined here as the charge per energy bandwidth and emission angle, of up to 7pC/MeV mrad played a key role in the recent experimental demonstration of free-electron lasing*. The simple and robust gas-shaping technique presented holds the potential to generate specific density profiles, which are essential for the application of adiabatic focusing or staging of accelerators.

Footnotes

  • Y.-Y. Chang, et al. “Reduction of the electron beam divergence of laser wakefield-accelerators by integrated plasma lenses“, Physical Review Applied 20, L061001(2023)
    ** M. Labat, J.P. Couperus Cabadağ, A. Ghaith, A. Irman, et al. “Seeded free-electron laser drive by a compact laser plasma accelerator” Nature Photonics 17, 150(2023)

Authors

Dr Arie Irman (Helmholtz Zentrum Dresden Rossendorf) Dr Yen-Yu Chang (Helmholtz Zentrum Dresden Rossendorf)

Co-authors

Mr Aaron Liberman (Weizmann Institute of Science) Dr Alexander Debus (Helmholtz Zentrum Dresden Rossendorf) Dr Amin Ghaith (Helmholtz Zentrum Dresden Rossendorf) Dr Jurjen Couperus Cabadag (Helmholtz Zentrum Dresden Rossendorf) Dr Maxwell LaBerge (Helmholtz Zentrum Dresden Rossendorf) Mr Patrick Ufer (Helmholtz Zentrum Dresden Rossendorf) Dr Richard Pausch (Helmholtz Zentrum Dresden Rossendorf) Mrs Salome Benracassa (Weizmann Institute of Science) Dr Sheroy Tata (Weizmann Institute of Science) Mrs Susanne Schöbel (Helmholtz Zentrum Dresden Rossendorf) Prof. Ulrich Schramm (Helmholtz Zentrum Dresden Rossendorf) Prof. Victor Malka (Weizmann Institute of Science)

Presentation materials

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