Transverse Confinement in Cascaded Inverse-Cherenkov Acceleration via Phase-Trajectory Control and Injection Matching
Abstract
Sub-relativistic electrons in micron-scale dielectric laser accelerators face coupled challenges of longitudinal dephasing and transverse defocusing, often imposing stringent requirements on injector emittance. Here, we demonstrate a combined strategy of phase-trajectory control and injection matching for sustained, confined acceleration. By coordinating the refractive-index and section-length sequences with the injected beam's Twiss parameters, we control accumulated phase slippage while maintaining transverse confinement. In a seven-section inverse-Cherenkov accelerator simulation, a 100-keV electron bunch with an initial normalized transverse emittance of 1 nm-rad and a relative kinetic-energy spread of 0.1% reaches 1154.7 keV over 1.545 mm, with a transverse rms beam size below 1 μm throughout the accelerating channels. The exit normalized emittance is 1.92 nm-rad, and the relative RMS kinetic-energy spread is 0.6%, with no particle loss under the specified tracking-acceptance criterion. The results demonstrate that coordinated structural sequencing and injection matching can relax injector-emittance requirements by up to approximately two orders of magnitude, offering a route toward compact dielectric accelerators for ultrafast electron diffraction, microscopy, and chip-scale coherent radiation.
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BibTeX
@misc{liu2026transverse,
title = {{Transverse Confinement in Cascaded Inverse-Cherenkov Acceleration via Phase-Trajectory Control and Injection Matching}},
author = {Yuanhao Liu and Nanshun Huang and Xionghao Yuan and Xingheng Wang and Juhao Wu and Haixiao Deng},
howpublished = {arXiv},
year = {2026},
month = oct,
doi = {10.48550/arxiv.2610.41806},
eprint = {2610.41806},
archivePrefix = {arXiv},
url = {https://arxiv.org/abs/2610.41806},
note = {CC BY 4.0},
}
RIS
TY - UNPB
TI - Transverse Confinement in Cascaded Inverse-Cherenkov Acceleration via Phase-Trajectory Control and Injection Matching
AU - Yuanhao Liu
AU - Nanshun Huang
AU - Xionghao Yuan
AU - Xingheng Wang
AU - Juhao Wu
AU - Haixiao Deng
PY - 2026
DA - 2026/10/30
PB - arXiv
DO - 10.48550/arxiv.2610.41806
UR - https://arxiv.org/abs/2610.41806
AB - Sub-relativistic electrons in micron-scale dielectric laser accelerators face coupled challenges of longitudinal dephasing and transverse defocusing, often imposing stringent requirements on injector emittance. Here, we demonstrate a combined strategy of phase-trajectory control and injection matching for sustained, confined acceleration. By coordinating the refractive-index and section-length sequences with the injected beam's Twiss parameters, we control accumulated phase slippage while maintaining transverse confinement. In a seven-section inverse-Cherenkov accelerator simulation, a 100-keV electron bunch with an initial normalized transverse emittance of 1 nm-rad and a relative kinetic-energy spread of 0.1% reaches 1154.7 keV over 1.545 mm, with a transverse rms beam size below 1 μm throughout the accelerating channels. The exit normalized emittance is 1.92 nm-rad, and the relative RMS kinetic-energy spread is 0.6%, with no particle loss under the specified tracking-acceptance criterion. The results demonstrate that coordinated structural sequencing and injection matching can relax injector-emittance requirements by up to approximately two orders of magnitude, offering a route toward compact dielectric accelerators for ultrafast electron diffraction, microscopy, and chip-scale coherent radiation.
ER -