Dependence of self-injected bunch parameters on the plasma density gradient and laser pulse amplitude at LWFA in a conical plasma channel
Abstract
Laser wakefield acceleration (LWFA) is an advanced method of high gradient acceleration of charged particles with wakefield excited in plasma by laser pulse. A distinctive feature of this method is the ability to create and accelerate so-called self-injected bunches with unique parameters - charge, energy, emittance, and geometric dimensions - without the need for an external injector of the required bunches for their subsequent acceleration to higher energies. Self-injected bunches emerge due to the plasma electrons trapping by the excited wakefield (self-injection phenomenon). For many applications, self-injected bunches can be used directly in relevant experiments. In this paper the dependence of the self-injected bunch parameters on the laser pulse amplitude and longitudinal gradient of plasma density in tapered plasma channel is investigated using numerical simulation with the WarpX code. At the laser amplitude a0=E0(me0cω/e)−1=3.6 in a conical channel with the radius decreasing from 4.0 c/ωpe to 2.16 c/ωpe and with the plasma density increasing linearly from ne=2.61·1019 cm−3 at the channel entrance to 3ne at the exit, a self-injected bunch is obtained with the charge 32.1 μC/m, the mean longitudinal momentum 111.9 mec, the length 5.10 μm, the area 5.3 μm2, the transverse emittance 1.6·10−2 mm·mrad.
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BibTeX
@misc{bondar2026dependence,
title = {{Dependence of self-injected bunch parameters on the plasma density gradient and laser pulse amplitude at LWFA in a conical plasma channel}},
author = {D. S. Bondar and V. I. Maslov and I. N. Onishchenko},
howpublished = {arXiv},
year = {2026},
month = sep,
doi = {10.48550/arxiv.2609.03479},
eprint = {2609.03479},
archivePrefix = {arXiv},
url = {https://arxiv.org/abs/2609.03479},
note = {CC BY 4.0},
}
RIS
TY - UNPB
TI - Dependence of self-injected bunch parameters on the plasma density gradient and laser pulse amplitude at LWFA in a conical plasma channel
AU - D. S. Bondar
AU - V. I. Maslov
AU - I. N. Onishchenko
PY - 2026
DA - 2026/09/03
PB - arXiv
DO - 10.48550/arxiv.2609.03479
UR - https://arxiv.org/abs/2609.03479
AB - Laser wakefield acceleration (LWFA) is an advanced method of high gradient acceleration of charged particles with wakefield excited in plasma by laser pulse. A distinctive feature of this method is the ability to create and accelerate so-called self-injected bunches with unique parameters - charge, energy, emittance, and geometric dimensions - without the need for an external injector of the required bunches for their subsequent acceleration to higher energies. Self-injected bunches emerge due to the plasma electrons trapping by the excited wakefield (self-injection phenomenon). For many applications, self-injected bunches can be used directly in relevant experiments. In this paper the dependence of the self-injected bunch parameters on the laser pulse amplitude and longitudinal gradient of plasma density in tapered plasma channel is investigated using numerical simulation with the WarpX code. At the laser amplitude a_0=E_0(m_e0cω/e)^−1=3.6 in a conical channel with the radius decreasing from 4.0 c/ω_pe to 2.16 c/ω_pe and with the plasma density increasing linearly from n_e=2.61·10^19 cm^−3 at the channel entrance to 3n_e at the exit, a self-injected bunch is obtained with the charge 32.1 μC/m, the mean longitudinal momentum 111.9 m_ec, the length 5.10 μm, the area 5.3 μm^2, the transverse emittance 1.6·10^−2 mm·mrad.
ER -