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Title: 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. 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., and Thomas, A. G. R. Tue . "High flux femtosecond x-ray emission from the electron-hose instability in laser wakefield accelerators". United States. doi: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}
}

Journal Article:
Free Publicly Available Full Text
Publisher's Version of Record
DOI: 10.1103/PhysRevAccelBeams.21.041303

Figures / Tables:

Figure 1 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 » m downstream with an x-ray camera. A two-stage, variable length gas cell is zoomed in. The acceleration length can be changed by adjusting the vertical height of the gas cell with respect to the main laser beam (as a result of the 45 degree incline in the second stage). The dashed arrows show the path of gas flow into the cell.« less

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    Works referencing / citing this record:

    Hybrid LWFA–PWFA staging as a beam energy and brightness transformer: conceptual design and simulations
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      Figures/Tables have been extracted from DOE-funded journal article accepted manuscripts.