High flux femtosecond x-ray emission from the electron-hose instability in laser wakefield accelerators
Abstract
Here, bright and ultrashort duration x-ray pulses can be produced by through betatron oscillations of electrons during laser wakefield acceleration (LWFA). Our experimental measurements using the Hercules laser system demonstrate a dramatic increase in x-ray flux for interaction distances beyond the depletion/dephasing lengths, where the initial electron bunch injected into the first wake bucket catches up with the laser pulse front and the laser pulse depletes. A transition from an LWFA regime to a beam-driven plasma wakefield acceleration regime consequently occurs. The drive electron bunch is susceptible to the electron-hose instability and rapidly develops large amplitude oscillations in its tail, which leads to greatly enhanced x-ray radiation emission. We measure the x-ray flux as a function of acceleration length using a variable length gas cell. 3D particle-in-cell simulations using a Monte Carlo synchrotron x-ray emission algorithm elucidate the time-dependent variations in the radiation emission processes.
- Authors:
- Publication Date:
- Research Org.:
- Princeton Plasma Physics Lab. (PPPL), Princeton, NJ (United States)
- Sponsoring Org.:
- USDOE National Nuclear Security Administration (NNSA)
- OSTI Identifier:
- 1434406
- Alternate Identifier(s):
- OSTI ID: 1436752
- Grant/Contract Number:
- NA0002372; 1054164; FA9550-12-1-0310
- Resource Type:
- Published Article
- Journal Name:
- Physical Review Accelerators and Beams
- Additional Journal Information:
- Journal Name: Physical Review Accelerators and Beams Journal Volume: 21 Journal Issue: 4; Journal ID: ISSN 2469-9888
- Publisher:
- American Physical Society
- Country of Publication:
- United States
- Language:
- English
- Subject:
- 43 PARTICLE ACCELERATORS
Citation Formats
Dong, C. F., Zhao, T. Z., Behm, K., Cummings, P. G., Nees, J., Maksimchuk, A., Yanovsky, V., Krushelnick, K., and Thomas, A. G. R. High flux femtosecond x-ray emission from the electron-hose instability in laser wakefield accelerators. United States: N. p., 2018.
Web. doi:10.1103/PhysRevAccelBeams.21.041303.
Dong, C. F., Zhao, T. Z., Behm, K., Cummings, P. G., Nees, J., Maksimchuk, A., Yanovsky, V., Krushelnick, K., & Thomas, A. G. R. High flux femtosecond x-ray emission from the electron-hose instability in laser wakefield accelerators. United States. https://doi.org/10.1103/PhysRevAccelBeams.21.041303
Dong, C. F., Zhao, T. Z., Behm, K., Cummings, P. G., Nees, J., Maksimchuk, A., Yanovsky, V., Krushelnick, K., and Thomas, A. G. R. Tue .
"High flux femtosecond x-ray emission from the electron-hose instability in laser wakefield accelerators". United States. https://doi.org/10.1103/PhysRevAccelBeams.21.041303.
@article{osti_1434406,
title = {High flux femtosecond x-ray emission from the electron-hose instability in laser wakefield accelerators},
author = {Dong, C. F. and Zhao, T. Z. and Behm, K. and Cummings, P. G. and Nees, J. and Maksimchuk, A. and Yanovsky, V. and Krushelnick, K. and Thomas, A. G. R.},
abstractNote = {Here, bright and ultrashort duration x-ray pulses can be produced by through betatron oscillations of electrons during laser wakefield acceleration (LWFA). Our experimental measurements using the Hercules laser system demonstrate a dramatic increase in x-ray flux for interaction distances beyond the depletion/dephasing lengths, where the initial electron bunch injected into the first wake bucket catches up with the laser pulse front and the laser pulse depletes. A transition from an LWFA regime to a beam-driven plasma wakefield acceleration regime consequently occurs. The drive electron bunch is susceptible to the electron-hose instability and rapidly develops large amplitude oscillations in its tail, which leads to greatly enhanced x-ray radiation emission. We measure the x-ray flux as a function of acceleration length using a variable length gas cell. 3D particle-in-cell simulations using a Monte Carlo synchrotron x-ray emission algorithm elucidate the time-dependent variations in the radiation emission processes.},
doi = {10.1103/PhysRevAccelBeams.21.041303},
journal = {Physical Review Accelerators and Beams},
number = 4,
volume = 21,
place = {United States},
year = {2018},
month = {4}
}
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https://doi.org/10.1103/PhysRevAccelBeams.21.041303
https://doi.org/10.1103/PhysRevAccelBeams.21.041303
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Figure 1: Schematic of the experimental setup. The main beam is focused using an $f$/20 off-axis paraboloid onto a two-stage gas cell. Electrons exiting the gas cell were swept by a dipole magnet and imaged using a LANEX screen in conjunction with a CCD camera. X rays were measured 2.5more »
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Works referencing / citing this record:
Hybrid LWFA–PWFA staging as a beam energy and brightness transformer: conceptual design and simulations
journal, June 2019
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Hybrid LWFA–PWFA staging as a beam energy and brightness transformer: conceptual design and simulations
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