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Title: Control of tunable, monoenergetic laser-plasma-accelerated electron beams using a shock-induced density downramp injector

Abstract

Control of the properties of laser-plasma-accelerated electron beams that were injected along a shock-induced density downramp through precision tailoring of the density profile was demonstrated using a 1.8 J, 45 fs laser interacting with a mm-scale gas jet. The effects on the beam spatial profile, steering, and absolute energy spread of the density region before the shock and tilt of the shock were investigated experimentally and with particle-in-cell simulations. By adjusting these density parameters, the electron beam quality was controlled and improved while the energy (30-180 MeV) and energy spread (2-11 MeV) were independently tuned. Simple models that are in good agreement with the experimental results are proposed to explain these relationships, advancing the understanding of downramp injection. In conclusion, this technique allows for high-quality electron beams with percent-level energy spread to be tailored based on the application.

Authors:
 [1];  [2];  [2];  [2];  [2];  [2];  [2];  [2];  [2];  [2];  [2];  [1]
  1. Lawrence Berkeley National Lab. (LBNL), Berkeley, CA (United States); Univ. of California, Berkeley, CA (United States)
  2. Lawrence Berkeley National Lab. (LBNL), Berkeley, CA (United States)
Publication Date:
Research Org.:
Lawrence Berkeley National Lab. (LBNL), Berkeley, CA (United States)
Sponsoring Org.:
USDOE Office of Science (SC), High Energy Physics (HEP) (SC-25)
OSTI Identifier:
1360864
Alternate Identifier(s):
OSTI ID: 1440952
Grant/Contract Number:  
AC02-05CH11231
Resource Type:
Published Article
Journal Name:
Physical Review Accelerators and Beams
Additional Journal Information:
Journal Volume: 20; Journal Issue: 5; Journal ID: ISSN 2469-9888
Publisher:
American Physical Society (APS)
Country of Publication:
United States
Language:
English
Subject:
43 PARTICLE ACCELERATORS

Citation Formats

Swanson, K. K., Tsai, H. -E., Barber, S. K., Lehe, R., Mao, H. -S., Steinke, S., van Tilborg, J., Nakamura, K., Geddes, C. G. R., Schroeder, C. B., Esarey, E., and Leemans, W. P. Control of tunable, monoenergetic laser-plasma-accelerated electron beams using a shock-induced density downramp injector. United States: N. p., 2017. Web. doi:10.1103/PhysRevAccelBeams.20.051301.
Swanson, K. K., Tsai, H. -E., Barber, S. K., Lehe, R., Mao, H. -S., Steinke, S., van Tilborg, J., Nakamura, K., Geddes, C. G. R., Schroeder, C. B., Esarey, E., & Leemans, W. P. Control of tunable, monoenergetic laser-plasma-accelerated electron beams using a shock-induced density downramp injector. United States. doi:10.1103/PhysRevAccelBeams.20.051301.
Swanson, K. K., Tsai, H. -E., Barber, S. K., Lehe, R., Mao, H. -S., Steinke, S., van Tilborg, J., Nakamura, K., Geddes, C. G. R., Schroeder, C. B., Esarey, E., and Leemans, W. P. Tue . "Control of tunable, monoenergetic laser-plasma-accelerated electron beams using a shock-induced density downramp injector". United States. doi:10.1103/PhysRevAccelBeams.20.051301.
@article{osti_1360864,
title = {Control of tunable, monoenergetic laser-plasma-accelerated electron beams using a shock-induced density downramp injector},
author = {Swanson, K. K. and Tsai, H. -E. and Barber, S. K. and Lehe, R. and Mao, H. -S. and Steinke, S. and van Tilborg, J. and Nakamura, K. and Geddes, C. G. R. and Schroeder, C. B. and Esarey, E. and Leemans, W. P.},
abstractNote = {Control of the properties of laser-plasma-accelerated electron beams that were injected along a shock-induced density downramp through precision tailoring of the density profile was demonstrated using a 1.8 J, 45 fs laser interacting with a mm-scale gas jet. The effects on the beam spatial profile, steering, and absolute energy spread of the density region before the shock and tilt of the shock were investigated experimentally and with particle-in-cell simulations. By adjusting these density parameters, the electron beam quality was controlled and improved while the energy (30-180 MeV) and energy spread (2-11 MeV) were independently tuned. Simple models that are in good agreement with the experimental results are proposed to explain these relationships, advancing the understanding of downramp injection. In conclusion, this technique allows for high-quality electron beams with percent-level energy spread to be tailored based on the application.},
doi = {10.1103/PhysRevAccelBeams.20.051301},
journal = {Physical Review Accelerators and Beams},
number = 5,
volume = 20,
place = {United States},
year = {2017},
month = {5}
}

Journal Article:
Free Publicly Available Full Text
Publisher's Version of Record
DOI: 10.1103/PhysRevAccelBeams.20.051301

Citation Metrics:
Cited by: 13 works
Citation information provided by
Web of Science

Figures / Tables:

FIG. 1 FIG. 1: (a) Schematic of the experimental setup. A razor blade was inserted into the flow of a supersonic gas jet, forming a shock. The main laser beam was focused into the shock region, producing electrons. A probe beam perpendicular to the shock front was imaged onto a wavefront sensormore » for density measurements. (b) OpenFOAM simulation of the razor blade in the gas flow showing an intercepting shock front. The color scale has been saturated to better see the intercepting shock. (c) Shock front angle versus blade coverage. The inset shows an example phase image from the wavefront sensor where the shock front angle α has been defined. The blue region is neutral density gas and the red/green is laser-ionized plasma. In both the neutral gas and plasma, the shock front can be seen.« less

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    Works referencing / citing this record:

    Reconstructing nonlinear plasma wakefields using a generalized temporally encoded spectral shifting analysis
    journal, October 2018


      Figures/Tables have been extracted from DOE-funded journal article accepted manuscripts.