Speaker
Description
Laser wakefield acceleration (LWFA) can produce accelerating fields of several hundred GV/m, greatly reducing accelerator size and cost. Carbon nanotube (CNT) bundles, featuring high plasma density (>10$^{19}$ cm$^{-3}$), tunable effective density, excellent thermal properties, and empty channels that enable laser propagation, have attracted interest as solid-state plasma sources. Previous studies suggested that CNT-based structures can increase the acceleration field to the TV/m range, making them promising for compact radiation sources and radiotherapy. However, the insufficient beam quality still limits their broader application. In this work, we model a hollow solid-state plasma channel composed of CNT bundles. A 2 PW laser from the ELI-ALPS High-Field Laser facility is injected into the channel, where self-injected electrons at the nC-scale are trapped and accelerated in a TV/m field, as shown by particle-in-cell simulations with WarpX. Comparing with previous LWFA results using solid-state targets, we obtain an electron beam with > 2 nC charge and > 100 MeV mean energy, while achieving an unprecedented energy spread < 5%, by tuning the filling factor, bundle diameter, and gap size. We clarify that the large energy spread in the overdense plasma arises from the laser-plasma instability. In addition, we observe strong scattering within the overdense bundle walls. We further aim to investigate how the scattering affects the laser field and, consequently, the beam quality.
Footnotes
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[] B. Lei et al., Plasma Phys. Control. Fusion (2025).
[] A. Bonatto et al., Phys. Plasmas (2023).
[] B. Lei et al., New J. Phys. (2025).
[] A. Pizzi et al., Adv. Sci. (2020).
[***] Z. Guo et al., Nat. Commun. (2025).
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