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Title: Role of Direct Laser Acceleration of Electrons in a Laser Wakefield Accelerator with Ionization Injection

Authors:
; ; ; ; ; ; ;
Publication Date:
Sponsoring Org.:
USDOE
OSTI Identifier:
1343353
Grant/Contract Number:
SC0010064
Resource Type:
Journal Article: Publisher's Accepted Manuscript
Journal Name:
Physical Review Letters
Additional Journal Information:
Journal Volume: 118; Journal Issue: 6; Related Information: CHORUS Timestamp: 2017-02-08 22:10:39; Journal ID: ISSN 0031-9007
Publisher:
American Physical Society
Country of Publication:
United States
Language:
English

Citation Formats

Shaw, J. L., Lemos, N., Amorim, L. D., Vafaei-Najafabadi, N., Marsh, K. A., Tsung, F. S., Mori, W. B., and Joshi, C.. Role of Direct Laser Acceleration of Electrons in a Laser Wakefield Accelerator with Ionization Injection. United States: N. p., 2017. Web. doi:10.1103/PhysRevLett.118.064801.
Shaw, J. L., Lemos, N., Amorim, L. D., Vafaei-Najafabadi, N., Marsh, K. A., Tsung, F. S., Mori, W. B., & Joshi, C.. Role of Direct Laser Acceleration of Electrons in a Laser Wakefield Accelerator with Ionization Injection. United States. doi:10.1103/PhysRevLett.118.064801.
Shaw, J. L., Lemos, N., Amorim, L. D., Vafaei-Najafabadi, N., Marsh, K. A., Tsung, F. S., Mori, W. B., and Joshi, C.. Wed . "Role of Direct Laser Acceleration of Electrons in a Laser Wakefield Accelerator with Ionization Injection". United States. doi:10.1103/PhysRevLett.118.064801.
@article{osti_1343353,
title = {Role of Direct Laser Acceleration of Electrons in a Laser Wakefield Accelerator with Ionization Injection},
author = {Shaw, J. L. and Lemos, N. and Amorim, L. D. and Vafaei-Najafabadi, N. and Marsh, K. A. and Tsung, F. S. and Mori, W. B. and Joshi, C.},
abstractNote = {},
doi = {10.1103/PhysRevLett.118.064801},
journal = {Physical Review Letters},
number = 6,
volume = 118,
place = {United States},
year = {Wed Feb 08 00:00:00 EST 2017},
month = {Wed Feb 08 00:00:00 EST 2017}
}

Journal Article:
Free Publicly Available Full Text
Publisher's Version of Record at 10.1103/PhysRevLett.118.064801

Citation Metrics:
Cited by: 1work
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  • A tomographic diagnosis method was developed to systematically resolve the injection and acceleration processes of a monoenergetic electron beam in a laser-wakefield accelerator. It was found that all the monoenergetic electrons are injected at the same location in the plasma column and accelerated from 5 to 55 MeV energy in 200 {mu}m distance. This is a direct measurement of the real acceleration gradient in a laser-wakefield accelerator, and the experimental data are consistent with the model of transverse wave breaking and beam loading for monoenergetic electron injection.
  • A tomographic method based on laser machining was used to resolve the electron injection and acceleration processes in a laser wakefield accelerator. It was found that all the electrons in the monoenergetic electron beam are injected at the same location in the plasma column and then accelerated with an acceleration gradient exceeding 2 GeV/cm. In addition, it was observed that there is no significant deceleration of the monoenergetic electron bunch after reaching the maximum energy and the injection position shifts with change of the position of pump-pulse focus. The results are consistent with the model of transverse wave-breaking and beammore » loading for injection of monoenergetic electrons. With this method the details of the underlying physical processes in a laser wakefield accelerator can be resolved and compared directly to the observations in particle-in-cell simulations.« less
  • A systematic experimental study on injection of electrons in a gas-jet-based laser wakefield accelerator via ionization of dopant was conducted. The pump-pulse threshold energy for producing a quasi-monoenergetic electron beam was significantly reduced by doping the hydrogen gas jet with argon atoms, resulting in a much better spatial contrast of the electron beam. Furthermore, laser wakefield electron acceleration in an optically preformed plasma waveguide based on the axicon-ignitor-heater scheme was achieved. It was found that doping with argon atoms can also lower the pump-pulse threshold energy in this experimental configuration.
  • Laser wakefield acceleration of 500 MeV to 1 GeV electron bunches has been demonstrated using ionization injection in mixtures of 4% to 10% of CO{sub 2} in He. 80 TW laser pulses were propagated through 5 mm gas jet targets at electron densities of 0.4-1.5 Multiplication-Sign 10{sup 19}cm{sup -3}. Ionization injection led to lower density thresholds, a higher total electron charge, and an increased probability of producing electrons above 500 MeV in energy compared to self-injection in He gas alone. Electrons with GeV energies were also observed on a few shots and indicative of an additional energy enhancement mechanism.
  • Ionization injection-assisted laser wakefield acceleration of electrons up to 120 MeV is demonstrated in a 1.5 mm long pure helium-like nitrogen plasma waveguide. The guiding structure stabilizes the high energy electron beam pointing and reduces the beam divergence. Our results are confirmed by 3D particle-in-cell simulations.