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Title: Relativistic laser driven electron accelerator using micro-channel plasma targets

Abstract

We present an experimental demonstration of the efficient acceleration of electrons beyond 60MeV using micro-channel plasma targets. We employed a high-contrast, 2.5 J, 32 fs short pulse laser interacting with a 5 lm inner diameter, 300 lm long microchannel plasma target. The micro-channel was aligned to be collinear with the incident laser pulse, confining the majority of the laser energy within the channel. The measured electron spectrum showed a large increase in the cut-off energy and slope temperature when compared to that from a 2 lm flat Copper target, with the cutoff energy more than doubled and the total energy in electrons >5MeV enhanced by over 10 times. Three-dimensional particle-in-cell simulations confirm efficient direct laser acceleration enabled by the novel structure as the dominant acceleration mechanism for the high energy electrons. The simulations further reveal the guiding effect of the channel that successfully explains preferential acceleration on the laser/channel axis observed in experiments. Finally, systematic simulations provide scalings for the energy and charge of the electron pulses. Our results show that the micro-channel plasma target is a promising electron source for applications such as ion acceleration, Bremsstrahlung X-ray radiation, and THZ generation.

Authors:
ORCiD logo [1]; ORCiD logo [2]; ORCiD logo [3];  [4];  [5];  [4];  [5];  [6];  [5];  [4];  [4];  [4];  [7];  [4]
  1. Miami Univ., Hamilton, OH (United States). Dept. of Mathematical and Physical Sciences
  2. Chinese Academy of Sciences (CAS), Shanghai (China). Shanghai Inst. of Optics and Fine Mechanics, State Key Lab. of High Field Laser Physics; CAS Center for Excellence in Ultra-intense Laser Science, Shanghai (China)
  3. Innovative Scientific Solutions Inc., Dayton, OH (United States)
  4. The Ohio State Univ., Columbus, OH (United States). Dept of Physics
  5. Lawrence Livermore National Lab. (LLNL), Livermore, CA (United States)
  6. Voss Scientific, Albuquerque, NM (United States)
  7. Chinese Academy of Sciences (CAS), Shanghai (China). Shanghai Inst. of Optics and Fine Mechanics, State Key Lab. of High Field Laser Physics; CAS Center for Excellence in Ultra-intense Laser Science, Shanghai (China); Shanghai Normal Univ., Shanghai (China)
Publication Date:
Research Org.:
The Ohio State Univ., Columbus, OH (United States)
Sponsoring Org.:
USDOE National Nuclear Security Administration (NNSA)
OSTI Identifier:
1515026
Grant/Contract Number:  
NA0003107
Resource Type:
Accepted Manuscript
Journal Name:
Physics of Plasmas
Additional Journal Information:
Journal Volume: 26; Journal Issue: 3; Journal ID: ISSN 1070-664X
Publisher:
American Institute of Physics (AIP)
Country of Publication:
United States
Language:
English
Subject:
70 PLASMA PHYSICS AND FUSION TECHNOLOGY

Citation Formats

Snyder, J., Ji, L. L., George, K. M., Willis, C., Cochran, G. E., Daskalova, R. L., Handler, A., Rubin, T., Poole, P. L., Nasir, D., Zingale, A., Chowdhury, E., Shen, B. F., and Schumacher, D. W. Relativistic laser driven electron accelerator using micro-channel plasma targets. United States: N. p., 2019. Web. doi:10.1063/1.5087409.
Snyder, J., Ji, L. L., George, K. M., Willis, C., Cochran, G. E., Daskalova, R. L., Handler, A., Rubin, T., Poole, P. L., Nasir, D., Zingale, A., Chowdhury, E., Shen, B. F., & Schumacher, D. W. Relativistic laser driven electron accelerator using micro-channel plasma targets. United States. doi:10.1063/1.5087409.
Snyder, J., Ji, L. L., George, K. M., Willis, C., Cochran, G. E., Daskalova, R. L., Handler, A., Rubin, T., Poole, P. L., Nasir, D., Zingale, A., Chowdhury, E., Shen, B. F., and Schumacher, D. W. Thu . "Relativistic laser driven electron accelerator using micro-channel plasma targets". United States. doi:10.1063/1.5087409.
@article{osti_1515026,
title = {Relativistic laser driven electron accelerator using micro-channel plasma targets},
author = {Snyder, J. and Ji, L. L. and George, K. M. and Willis, C. and Cochran, G. E. and Daskalova, R. L. and Handler, A. and Rubin, T. and Poole, P. L. and Nasir, D. and Zingale, A. and Chowdhury, E. and Shen, B. F. and Schumacher, D. W.},
abstractNote = {We present an experimental demonstration of the efficient acceleration of electrons beyond 60MeV using micro-channel plasma targets. We employed a high-contrast, 2.5 J, 32 fs short pulse laser interacting with a 5 lm inner diameter, 300 lm long microchannel plasma target. The micro-channel was aligned to be collinear with the incident laser pulse, confining the majority of the laser energy within the channel. The measured electron spectrum showed a large increase in the cut-off energy and slope temperature when compared to that from a 2 lm flat Copper target, with the cutoff energy more than doubled and the total energy in electrons >5MeV enhanced by over 10 times. Three-dimensional particle-in-cell simulations confirm efficient direct laser acceleration enabled by the novel structure as the dominant acceleration mechanism for the high energy electrons. The simulations further reveal the guiding effect of the channel that successfully explains preferential acceleration on the laser/channel axis observed in experiments. Finally, systematic simulations provide scalings for the energy and charge of the electron pulses. Our results show that the micro-channel plasma target is a promising electron source for applications such as ion acceleration, Bremsstrahlung X-ray radiation, and THZ generation.},
doi = {10.1063/1.5087409},
journal = {Physics of Plasmas},
number = 3,
volume = 26,
place = {United States},
year = {2019},
month = {3}
}

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