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8 June 2023 Average current enhancement of laser-plasma accelerators (Conference Presentation)
Lorenzo Martelli, Igor Andriyash, Olena Kononenko, Julien Gautier, Jean-Philippe Goddet, Amar Tafzi, Ronan Lahaye, Cédric Thaury
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Proceedings Volume PC12579, Laser Acceleration of Electrons, Protons, and Ions VII; PC125790A (2023) https://doi.org/10.1117/12.2666435
Event: SPIE Optics + Optoelectronics, 2023, Prague, Czech Republic
Abstract
Since they have been proposed, laser-plasma accelerators have interested the scientific community for their ability to generate electric fields exceeding the ones of Linacs and RF cavities. Several efforts have been made in order to produce monochromatic electron beams and to increase their maximum energy, often at the expense of the charge. However, some applications like femtosecond chemistry, radio-biology and industrial radiography do not need monochromatic beams, but rather highly charged ones (i.e., > 1 nC). For some of these applications it is also necessary to reduce the amount of high energy electrons (i.e., > 10 MeV), in order to avoid the activation of materials. Such beams can be produced using high Z gases like Nitrogen and Argon, exploiting the ionization injection of several plasma period. Here we numerically and experimentally investigate this little-known regime, employing different laser energies, f-numbers and plasma densities. This allowed us to find the conditions to produce electron beams with charges up to tens of nC and exceeding 100 mrad in divergence. We will also show and explain the dependencies of these beams (e.g., their charges and energy spectra) as functions of the aforementioned laser and plasma parameters.
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Lorenzo Martelli, Igor Andriyash, Olena Kononenko, Julien Gautier, Jean-Philippe Goddet, Amar Tafzi, Ronan Lahaye, and Cédric Thaury "Average current enhancement of laser-plasma accelerators (Conference Presentation)", Proc. SPIE PC12579, Laser Acceleration of Electrons, Protons, and Ions VII, PC125790A (8 June 2023); https://doi.org/10.1117/12.2666435
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KEYWORDS
Plasma
Electron beams
Chemistry
Electric fields
Femtosecond phenomena
Gases
Ionization
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