Electron Rephasing in a Truncated Tunable Plasma Channel
Abstract
We report the acceleration of stable electron beams with energies up to 1.5 GeV using a 50 TW laser pulse guided in a preformed plasma channel generated by an axiparabola-focused heater pulse. Varying the channel length changes the plasma density beyond the channel end and produces distinct electron spectra. A short channel causes a large decrease in bubble size after the truncated channel, leaving only part of the electron bunch in the accelerating phase and resulting in a quasi-monoenergetic peak. For a longer channel ending near the target density down-ramp, the smaller density increase rephases and further accelerates a larger fraction of the bunch, producing a continuous high-charge spectrum. Hydrodynamic and particle-in-cell simulations reproduce the observed spectral evolution. Together, the measurements and simulations identify channel length as a key control parameter in guided laser-wakefield acceleration.
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BibTeX
@misc{mohanty2026electron,
title = {{Electron Rephasing in a Truncated Tunable Plasma Channel}},
author = {Arujash Mohanty and Santhosh Krishnamurthy and Yinren Shou and Sheroy Tata and Anton Golovanov and Anda-Maria Talposi and Aaron Liberman and Eyal Kroupp and Victor Malka},
howpublished = {arXiv},
year = {2026},
month = sep,
doi = {10.48550/arxiv.2609.36964},
eprint = {2609.36964},
archivePrefix = {arXiv},
url = {https://arxiv.org/abs/2609.36964},
}
RIS
TY - UNPB
TI - Electron Rephasing in a Truncated Tunable Plasma Channel
AU - Arujash Mohanty
AU - Santhosh Krishnamurthy
AU - Yinren Shou
AU - Sheroy Tata
AU - Anton Golovanov
AU - Anda-Maria Talposi
AU - Aaron Liberman
AU - Eyal Kroupp
AU - Victor Malka
PY - 2026
DA - 2026/09/29
PB - arXiv
DO - 10.48550/arxiv.2609.36964
UR - https://arxiv.org/abs/2609.36964
AB - We report the acceleration of stable electron beams with energies up to 1.5 GeV using a 50 TW laser pulse guided in a preformed plasma channel generated by an axiparabola-focused heater pulse. Varying the channel length changes the plasma density beyond the channel end and produces distinct electron spectra. A short channel causes a large decrease in bubble size after the truncated channel, leaving only part of the electron bunch in the accelerating phase and resulting in a quasi-monoenergetic peak. For a longer channel ending near the target density down-ramp, the smaller density increase rephases and further accelerates a larger fraction of the bunch, producing a continuous high-charge spectrum. Hydrodynamic and particle-in-cell simulations reproduce the observed spectral evolution. Together, the measurements and simulations identify channel length as a key control parameter in guided laser-wakefield acceleration.
ER -