Overcoming the dephasing limit in multiple-pulse laser wakefield acceleration
Abstract
The electric field in laser-driven plasma wakefield acceleration is orders of magnitude higher than conventional radio-frequency cavities, but the energy gain is limited by dephasing between the ultrarelativistic electron bunch and the wakefield, which travels at the laser group velocity. We present a way to overcome this limit within a single plasma stage. The amplitude of the wakefield behind a train of laser pulses can be controlled in-flight by modulating the density profile. This creates a succession of resonant laser-plasma accelerator sections and nonresonant drift sections, within which the wakefield disappears and the electrons rephase. A two-dimensional particle-in-cell simulation with four 2.5 TW laser pulses produces a 50 MeV electron energy gain, four times that obtained from a uniform plasma. Although laser redshift prevents operation in the blowout regime, the technique offers increased energy gain for accelerators limited to the linear regime by the available laser power. This is particularly relevant for laser-plasma x-ray sources capable of operating at high repetition rates, which are highly sought after.
- Publication Date:
- Research Org.:
- Los Alamos National Laboratory (LANL), Los Alamos, NM (United States)
- Sponsoring Org.:
- USDOE Laboratory Directed Research and Development (LDRD) Program
- OSTI Identifier:
- 1601049
- Alternate Identifier(s):
- OSTI ID: 1716794
- Report Number(s):
- LA-UR-19-30482
Journal ID: ISSN 2469-9888; PRABCJ; 021303
- Grant/Contract Number:
- 20180040DR; 89233218CNA000001
- Resource Type:
- Published Article
- Journal Name:
- Physical Review Accelerators and Beams
- Additional Journal Information:
- Journal Name: Physical Review Accelerators and Beams Journal Volume: 23 Journal Issue: 2; Journal ID: ISSN 2469-9888
- Publisher:
- American Physical Society (APS)
- Country of Publication:
- United States
- Language:
- English
- Subject:
- 43 PARTICLE ACCELERATORS; Plasma; Electrostatic waves & oscillations; Laser driven electron acceleration; Laser wakefield acceleration; Particle acceleration in plasmas
Citation Formats
Sadler, James D., Arran, Christopher, Li, Hui, and Flippo, Kirk A. Overcoming the dephasing limit in multiple-pulse laser wakefield acceleration. United States: N. p., 2020.
Web. doi:10.1103/PhysRevAccelBeams.23.021303.
Sadler, James D., Arran, Christopher, Li, Hui, & Flippo, Kirk A. Overcoming the dephasing limit in multiple-pulse laser wakefield acceleration. United States. https://doi.org/10.1103/PhysRevAccelBeams.23.021303
Sadler, James D., Arran, Christopher, Li, Hui, and Flippo, Kirk A. Fri .
"Overcoming the dephasing limit in multiple-pulse laser wakefield acceleration". United States. https://doi.org/10.1103/PhysRevAccelBeams.23.021303.
@article{osti_1601049,
title = {Overcoming the dephasing limit in multiple-pulse laser wakefield acceleration},
author = {Sadler, James D. and Arran, Christopher and Li, Hui and Flippo, Kirk A.},
abstractNote = {The electric field in laser-driven plasma wakefield acceleration is orders of magnitude higher than conventional radio-frequency cavities, but the energy gain is limited by dephasing between the ultrarelativistic electron bunch and the wakefield, which travels at the laser group velocity. We present a way to overcome this limit within a single plasma stage. The amplitude of the wakefield behind a train of laser pulses can be controlled in-flight by modulating the density profile. This creates a succession of resonant laser-plasma accelerator sections and nonresonant drift sections, within which the wakefield disappears and the electrons rephase. A two-dimensional particle-in-cell simulation with four 2.5 TW laser pulses produces a 50 MeV electron energy gain, four times that obtained from a uniform plasma. Although laser redshift prevents operation in the blowout regime, the technique offers increased energy gain for accelerators limited to the linear regime by the available laser power. This is particularly relevant for laser-plasma x-ray sources capable of operating at high repetition rates, which are highly sought after.},
doi = {10.1103/PhysRevAccelBeams.23.021303},
journal = {Physical Review Accelerators and Beams},
number = 2,
volume = 23,
place = {United States},
year = {Fri Feb 21 00:00:00 EST 2020},
month = {Fri Feb 21 00:00:00 EST 2020}
}
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https://doi.org/10.1103/PhysRevAccelBeams.23.021303
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Cited by: 7 works
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