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Title: Laser beam coupling with capillary discharge plasma for laser wakefield acceleration applications

Authors:
 [1];  [2];  [1]; ORCiD logo [1];  [2];  [3];  [3]; ORCiD logo [3]; ORCiD logo [3];  [3];  [3];  [3];  [3];  [4];  [4];  [4]
  1. Keldysh Institute of Applied Mathematics, Moscow 125047, Russia, National Research Nuclear University MEPhI (Moscow Engineering Physics Institute), Moscow 115409, Russia
  2. Keldysh Institute of Applied Mathematics, Moscow 125047, Russia
  3. Lawrence Berkeley National Laboratory, Berkeley, California 94720, USA
  4. Institute of Physics ASCR, v.v.i. (FZU), ELI-Beamlines Project, 182 21 Prague, Czech Republic
Publication Date:
Sponsoring Org.:
USDOE
OSTI Identifier:
1374092
Grant/Contract Number:
AC02-05CH11231
Resource Type:
Journal Article: Publisher's Accepted Manuscript
Journal Name:
Physics of Plasmas
Additional Journal Information:
Journal Volume: 24; Journal Issue: 8; Related Information: CHORUS Timestamp: 2018-02-14 14:38:17; Journal ID: ISSN 1070-664X
Publisher:
American Institute of Physics
Country of Publication:
United States
Language:
English

Citation Formats

Bagdasarov, G. A., Sasorov, P. V., Gasilov, V. A., Boldarev, A. S., Olkhovskaya, O. G., Benedetti, C., Bulanov, S. S., Gonsalves, A., Mao, H. -S., Schroeder, C. B., van Tilborg, J., Esarey, E., Leemans, W. P., Levato, T., Margarone, D., and Korn, G. Laser beam coupling with capillary discharge plasma for laser wakefield acceleration applications. United States: N. p., 2017. Web. doi:10.1063/1.4997606.
Bagdasarov, G. A., Sasorov, P. V., Gasilov, V. A., Boldarev, A. S., Olkhovskaya, O. G., Benedetti, C., Bulanov, S. S., Gonsalves, A., Mao, H. -S., Schroeder, C. B., van Tilborg, J., Esarey, E., Leemans, W. P., Levato, T., Margarone, D., & Korn, G. Laser beam coupling with capillary discharge plasma for laser wakefield acceleration applications. United States. doi:10.1063/1.4997606.
Bagdasarov, G. A., Sasorov, P. V., Gasilov, V. A., Boldarev, A. S., Olkhovskaya, O. G., Benedetti, C., Bulanov, S. S., Gonsalves, A., Mao, H. -S., Schroeder, C. B., van Tilborg, J., Esarey, E., Leemans, W. P., Levato, T., Margarone, D., and Korn, G. 2017. "Laser beam coupling with capillary discharge plasma for laser wakefield acceleration applications". United States. doi:10.1063/1.4997606.
@article{osti_1374092,
title = {Laser beam coupling with capillary discharge plasma for laser wakefield acceleration applications},
author = {Bagdasarov, G. A. and Sasorov, P. V. and Gasilov, V. A. and Boldarev, A. S. and Olkhovskaya, O. G. and Benedetti, C. and Bulanov, S. S. and Gonsalves, A. and Mao, H. -S. and Schroeder, C. B. and van Tilborg, J. and Esarey, E. and Leemans, W. P. and Levato, T. and Margarone, D. and Korn, G.},
abstractNote = {},
doi = {10.1063/1.4997606},
journal = {Physics of Plasmas},
number = 8,
volume = 24,
place = {United States},
year = 2017,
month = 8
}

Journal Article:
Free Publicly Available Full Text
This content will become publicly available on August 7, 2018
Publisher's Accepted Manuscript

Citation Metrics:
Cited by: 1work
Citation information provided by
Web of Science

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  • The evolution of longitudinal electron density and temperature profiles in plasma channel produced by a low-current Plexiglas capillary discharge with laser ignition was investigated by spectroscopic methods. The plasma was produced by an electric discharge using a 0.5 mm diameter, 15 mm long Plexiglas capillary. The electron density measured in near-outlet region was found to be lower by 30%. Simulations show that this variation of the plasma density near the entrance of the capillary can pose substantial difficulties for external injection of electrons for laser wakefield accelerator applications.
  • Laser wakefield acceleration of electrons well beyond 1 GeV and optical guiding of ultraintense laser pulses of peak powers up to 160 TW over a 4-cm long ablative capillary discharge plasma channel were experimentally demonstrated. Electron beams, with energies up to 1.8 GeV, were generated by using the 130 TW, 55 fs driving laser pulses. A comparison of oxygen-containing acrylic resin (C:O:H = 4:2:7) capillary and no oxygen-containing polyethylene (C:O:H = 1:0:2) capillary measurements suggests that the injection of electron into the laser wakefield is assisted by the ionization of oxygen K-shell electrons.
  • We developed a gas-filled capillary with a tapered density for laser wakefield acceleration, of which the tapering was realized by employing gas feed-lines with different cross-sections. Plasma diagnostics show that the capillary plasma has a significant longitudinal density tapering and a transverse parabolic profile. By using the tapered capillary plasma, high transmission (over 90%) of laser beams, meaning good optical guiding, was observed. These results demonstrate the potential of the tapered plasma source for high-energy laser wakefield acceleration, where the dephasing problem is minimized.
  • Laser wakefield electron acceleration in the blow-out regime and the associated betatron X-ray radiation were investigated experimentally as a function of the plasma density in a configuration where the laser is guided. Dielectric capillary tubes were employed to assist the laser keeping self-focused over a long distance by collecting the laser energy around its central focal spot. With a 40 fs, 16 TW pulsed laser, electron bunches with tens of pC charge were measured to be accelerated to an energy up to 300 MeV, accompanied by X-ray emission with a peak brightness of the order of 10{sup 21} ph/s/mm{sup 2}/mrad{supmore » 2}/0.1%BW. Electron trapping and acceleration were studied using the emitted X-ray beam distribution to map the acceleration process; the number of betatron oscillations performed by the electrons was inferred from the correlation between measured X-ray fluence and beam charge. A study of the stability of electron and X-ray generation suggests that the fluctuation of X-ray emission can be reduced by stabilizing the beam charge. The experimental results are in good agreement with 3D particle-in-cell (PIC) simulation.« less
  • Gas-filled capillary discharge waveguides are commonly used as media for plasma wakefield accelerators. We show that effective waveguides can be manufactured using a femtosecond laser micromachining technique to produce a linearly tapered plasma density, which enables the energy of the accelerator to be enhanced significantly. A laser guiding efficiency in excess of 82% at sub-relativistic intensities has been demonstrated in a 40 mm long capillary with a diameter tapering from 320 {mu}m to 270 {mu}m, which gives rise to an on-axis, time-averaged plasma density that varies from 1.0 x 10{sup 18} cm{sup -3} to 1.6 x 10{sup 18} cm{sup -3}.