Simulation Design for Velocity-Controlled Spatio-Temporal Drivers in Laser Wakefield Acceleration
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| Main Authors: | , , , |
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| Format: | Preprint |
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2026
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| _version_ | 1866917438283579392 |
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| author | Badiali, Chiara Almeida, Rafael Silva, Thales Vieira, Jorge |
| author_facet | Badiali, Chiara Almeida, Rafael Silva, Thales Vieira, Jorge |
| contents | Velocity-controlled spatio-temporal (ST) laser drivers offer a route to tailoring laser-plasma interactions by allowing the velocity of the intensity peak to be controlled independently of the envelope group velocity. In this work, we present a simulation-design workflow for PIC modelling of subluminal velocity-controlled ST pulses in OSIRIS based on a Maxwell-consistent spectral construction expressed as a superposition of exact vacuum solutions, and we describe its discrete k-space representation for numerical initialisation. We then examine wakefield excitation with velocity-controlled drivers, showing how the ST geometry couples the effective longitudinal extent of the high-intensity region to the transverse scale and deriving scaling guidelines for near-resonant excitation in the subluminal regime. Finally, we discuss the geometric constraints that make long-distance simulations costly, including focus-envelope slippage and strong transverse expansion, and we show that continuous wall injection can reproduce the intended vacuum propagation while substantially reducing the transverse domain size. Together, these results provide practical guidelines for accurate and computationally efficient PIC simulations of velocity-controlled ST drivers in wakefield-relevant regimes. |
| format | Preprint |
| id |
arxiv_https___arxiv_org_abs_2603_28473 |
| institution | arXiv |
| publishDate | 2026 |
| record_format | arxiv |
| spellingShingle | Simulation Design for Velocity-Controlled Spatio-Temporal Drivers in Laser Wakefield Acceleration Badiali, Chiara Almeida, Rafael Silva, Thales Vieira, Jorge Plasma Physics Velocity-controlled spatio-temporal (ST) laser drivers offer a route to tailoring laser-plasma interactions by allowing the velocity of the intensity peak to be controlled independently of the envelope group velocity. In this work, we present a simulation-design workflow for PIC modelling of subluminal velocity-controlled ST pulses in OSIRIS based on a Maxwell-consistent spectral construction expressed as a superposition of exact vacuum solutions, and we describe its discrete k-space representation for numerical initialisation. We then examine wakefield excitation with velocity-controlled drivers, showing how the ST geometry couples the effective longitudinal extent of the high-intensity region to the transverse scale and deriving scaling guidelines for near-resonant excitation in the subluminal regime. Finally, we discuss the geometric constraints that make long-distance simulations costly, including focus-envelope slippage and strong transverse expansion, and we show that continuous wall injection can reproduce the intended vacuum propagation while substantially reducing the transverse domain size. Together, these results provide practical guidelines for accurate and computationally efficient PIC simulations of velocity-controlled ST drivers in wakefield-relevant regimes. |
| title | Simulation Design for Velocity-Controlled Spatio-Temporal Drivers in Laser Wakefield Acceleration |
| topic | Plasma Physics |
| url | https://arxiv.org/abs/2603.28473 |