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Title: Evolution of plasma wakes in density up- and down-ramps

Abstract

The time evolution of plasma wakes in density up- and down-ramps is examined through theory and particle-in-cell simulations. Motivated by observation of the reversal of a linear plasma wake in a plasma density upramp in a recent experiment (Zhang et al 2017 Phys. Rev. Lett. 119 064801) we have examined the behaviour of wakes in plasma ramps that always accompany any plasma source used for plasma-based acceleration. In the up-ramp case it is found that, after the passage of the drive pulse, the wavnumber/wavelength of the wake starts to decrease/increase with time until it eventually tends to zero/infinity, then the wake reverses its propagation direction and the wavenunber/wavelength of the wake begins to increase/shrink. The evolutions of the wavenumber and the phase velocity of the wake as functions of time are shown to be significantly different in the up-ramp and the down-ramp cases. In the latter case the wavenumber of the wake at a particular position in the ramp increases until the wake is eventually damped. It is also shown that the waveform of the wake at a particular time after being excited can be precisely controlled by tuning the initial plasma density profile, which may enable a new typemore » of plasma-based ultrafast optics.« less

Authors:
ORCiD logo [1];  [1];  [1];  [1]; ORCiD logo [2]; ORCiD logo [2];  [2];  [2];  [3];  [2]
  1. Univ. of California Los Angeles, Los Angeles, CA (United States)
  2. Tsinghua Univ., Beijing (China). Dept. Engineering of Physics
  3. Academia Sinica, Taipei (Taiwan). Inst. of Atomic and Molecular Sciences
Publication Date:
Research Org.:
Lawrence Berkeley National Laboratory-National Energy Research Scientific Computing Center
Sponsoring Org.:
USDOE
OSTI Identifier:
1523478
DOE Contract Number:  
SC0010064; SC0008491; SC0008316; SC0014260
Resource Type:
Journal Article
Journal Name:
Plasma Physics and Controlled Fusion
Additional Journal Information:
Journal Volume: 60; Journal Issue: 2; Journal ID: ISSN 0741-3335
Country of Publication:
United States
Language:
English

Citation Formats

Zhang, C. J., Joshi, C., Xu, X. L., Mori, W. B., Li, F., Wan, Y., Hua, J. F., Pai, C. H., Wang, J., and Lu, W. Evolution of plasma wakes in density up- and down-ramps. United States: N. p., 2018. Web. doi:10.1088/1361-6587/aa9d27.
Zhang, C. J., Joshi, C., Xu, X. L., Mori, W. B., Li, F., Wan, Y., Hua, J. F., Pai, C. H., Wang, J., & Lu, W. Evolution of plasma wakes in density up- and down-ramps. United States. doi:10.1088/1361-6587/aa9d27.
Zhang, C. J., Joshi, C., Xu, X. L., Mori, W. B., Li, F., Wan, Y., Hua, J. F., Pai, C. H., Wang, J., and Lu, W. Wed . "Evolution of plasma wakes in density up- and down-ramps". United States. doi:10.1088/1361-6587/aa9d27.
@article{osti_1523478,
title = {Evolution of plasma wakes in density up- and down-ramps},
author = {Zhang, C. J. and Joshi, C. and Xu, X. L. and Mori, W. B. and Li, F. and Wan, Y. and Hua, J. F. and Pai, C. H. and Wang, J. and Lu, W.},
abstractNote = {The time evolution of plasma wakes in density up- and down-ramps is examined through theory and particle-in-cell simulations. Motivated by observation of the reversal of a linear plasma wake in a plasma density upramp in a recent experiment (Zhang et al 2017 Phys. Rev. Lett. 119 064801) we have examined the behaviour of wakes in plasma ramps that always accompany any plasma source used for plasma-based acceleration. In the up-ramp case it is found that, after the passage of the drive pulse, the wavnumber/wavelength of the wake starts to decrease/increase with time until it eventually tends to zero/infinity, then the wake reverses its propagation direction and the wavenunber/wavelength of the wake begins to increase/shrink. The evolutions of the wavenumber and the phase velocity of the wake as functions of time are shown to be significantly different in the up-ramp and the down-ramp cases. In the latter case the wavenumber of the wake at a particular position in the ramp increases until the wake is eventually damped. It is also shown that the waveform of the wake at a particular time after being excited can be precisely controlled by tuning the initial plasma density profile, which may enable a new type of plasma-based ultrafast optics.},
doi = {10.1088/1361-6587/aa9d27},
journal = {Plasma Physics and Controlled Fusion},
issn = {0741-3335},
number = 2,
volume = 60,
place = {United States},
year = {2018},
month = {1}
}