skip to main content
DOE PAGES title logo U.S. Department of Energy
Office of Scientific and Technical Information

Title: Dynamic focusing of laser driven positron jets by self-generated fields

Abstract

Focusing effect of laser-driven positron jets by self-generated target sheath fields has been observed for the first time experimentally and the results are supported by the computational studies. In the experiment, OMEGA EP short-pulse (0.7 ps, 500 J) irradiates mm-size gold targets with a concave back surface and reference flat-surface targets. Both targets exhibited positrons with quasi-monoenergetic energy peaks while targets with concave curvature also showed increased number of positrons at the detector. The data is consistent with hybrid-PIC simulations confirming that the time-varying electric fields driven by electrons escaping from the target significantly change the trajectories of positrons. These simulations show a small radius of curvature on the rear side increases the relative focusing effect and the positrons to electrons ratio in the escaping plasma. For the smallest radius of curvature, positron jets that are up to 10 times denser can be achieved.

Authors:
; ; ; ; ; ; ; ; ; ; ORCiD logo; ; ORCiD logo;
Publication Date:
Research Org.:
Lawrence Livermore National Lab. (LLNL), Livermore, CA (United States)
Sponsoring Org.:
USDOE National Nuclear Security Administration (NNSA); USDOE Laboratory Directed Research and Development (LDRD) Program
OSTI Identifier:
1737842
Alternate Identifier(s):
OSTI ID: 1772318
Report Number(s):
LLNL-JRNL-812994
Journal ID: ISSN 1367-2630
Grant/Contract Number:  
AC52-07NA27344
Resource Type:
Published Article
Journal Name:
New Journal of Physics
Additional Journal Information:
Journal Name: New Journal of Physics Journal Volume: 22 Journal Issue: 12; Journal ID: ISSN 1367-2630
Publisher:
IOP Publishing
Country of Publication:
United Kingdom
Language:
English
Subject:
70 PLASMA PHYSICS AND FUSION TECHNOLOGY

Citation Formats

Kim, J., Link, A., Canning, D., Fitzsimmons, P., Fooks, J. A., Kerr, S., Ma, T., Manuel, M. J-E, Mariscal, D., Wallace, R., Williams, G. J., Willingale, L., Beg, F. N., and Chen, H.. Dynamic focusing of laser driven positron jets by self-generated fields. United Kingdom: N. p., 2020. Web. https://doi.org/10.1088/1367-2630/abcc1f.
Kim, J., Link, A., Canning, D., Fitzsimmons, P., Fooks, J. A., Kerr, S., Ma, T., Manuel, M. J-E, Mariscal, D., Wallace, R., Williams, G. J., Willingale, L., Beg, F. N., & Chen, H.. Dynamic focusing of laser driven positron jets by self-generated fields. United Kingdom. https://doi.org/10.1088/1367-2630/abcc1f
Kim, J., Link, A., Canning, D., Fitzsimmons, P., Fooks, J. A., Kerr, S., Ma, T., Manuel, M. J-E, Mariscal, D., Wallace, R., Williams, G. J., Willingale, L., Beg, F. N., and Chen, H.. Tue . "Dynamic focusing of laser driven positron jets by self-generated fields". United Kingdom. https://doi.org/10.1088/1367-2630/abcc1f.
@article{osti_1737842,
title = {Dynamic focusing of laser driven positron jets by self-generated fields},
author = {Kim, J. and Link, A. and Canning, D. and Fitzsimmons, P. and Fooks, J. A. and Kerr, S. and Ma, T. and Manuel, M. J-E and Mariscal, D. and Wallace, R. and Williams, G. J. and Willingale, L. and Beg, F. N. and Chen, H.},
abstractNote = {Focusing effect of laser-driven positron jets by self-generated target sheath fields has been observed for the first time experimentally and the results are supported by the computational studies. In the experiment, OMEGA EP short-pulse (0.7 ps, 500 J) irradiates mm-size gold targets with a concave back surface and reference flat-surface targets. Both targets exhibited positrons with quasi-monoenergetic energy peaks while targets with concave curvature also showed increased number of positrons at the detector. The data is consistent with hybrid-PIC simulations confirming that the time-varying electric fields driven by electrons escaping from the target significantly change the trajectories of positrons. These simulations show a small radius of curvature on the rear side increases the relative focusing effect and the positrons to electrons ratio in the escaping plasma. For the smallest radius of curvature, positron jets that are up to 10 times denser can be achieved.},
doi = {10.1088/1367-2630/abcc1f},
journal = {New Journal of Physics},
number = 12,
volume = 22,
place = {United Kingdom},
year = {2020},
month = {12}
}

Journal Article:
Free Publicly Available Full Text
Publisher's Version of Record
https://doi.org/10.1088/1367-2630/abcc1f

Save / Share:

Works referenced in this record:

Relativistic Quasimonoenergetic Positron Jets from Intense Laser-Solid Interactions
journal, July 2010


Coupled particle-in-cell and Monte Carlo transport modeling of intense radiographic sources
journal, March 2002

  • Rose, D. V.; Welch, D. R.; Oliver, B. V.
  • Journal of Applied Physics, Vol. 91, Issue 5
  • DOI: 10.1063/1.1448868

The scaling of electron and positron generation in intense laser-solid interactionsa)
journal, May 2015

  • Chen, Hui; Link, A.; Sentoku, Y.
  • Physics of Plasmas, Vol. 22, Issue 5
  • DOI: 10.1063/1.4921147

Experimental Observation of a Current-Driven Instability in a Neutral Electron-Positron Beam
journal, November 2017


Computational modeling of proton acceleration with multi-picosecond and high energy, kilojoule, lasers
journal, August 2018

  • Kim, J.; Kemp, A. J.; Wilks, S. C.
  • Physics of Plasmas, Vol. 25, Issue 8
  • DOI: 10.1063/1.5040410

Proton trajectories and electric fields in a laser-accelerated focused proton beam
journal, May 2012

  • Foord, M. E.; Bartal, T.; Bellei, C.
  • Physics of Plasmas, Vol. 19, Issue 5
  • DOI: 10.1063/1.3700181

Absorption of ultra-intense laser pulses
journal, August 1992


Isochoric Heating of Solid-Density Matter with an Ultrafast Proton Beam
journal, September 2003


Particle acceleration in relativistic laser channels
journal, July 1999

  • Pukhov, A.; Sheng, Z. -M.; Meyer-ter-Vehn, J.
  • Physics of Plasmas, Vol. 6, Issue 7
  • DOI: 10.1063/1.873242

Multi-gigaelectronvolt acceleration of positrons in a self-loaded plasma wakefield
journal, August 2015


Quasimonoenergetic laser plasma positron accelerator using particle-shower plasma-wave interactions
journal, August 2018


Enhanced Multi-MeV Photon Emission by a Laser-Driven Electron Beam in a Self-Generated Magnetic Field
journal, May 2016


Table-Top Laser-Based Source of Femtosecond, Collimated, Ultrarelativistic Positron Beams
journal, June 2013


Acceleration of positrons by electron beam-driven wakefields in a plasma
journal, February 2007


Magnetic collimation of relativistic positrons and electrons from high intensity laser–matter interactions
journal, April 2014

  • Chen, Hui; Fiksel, G.; Barnak, D.
  • Physics of Plasmas, Vol. 21, Issue 4
  • DOI: 10.1063/1.4873711

Defect imaging and detection of precipitates using a new scanning positron microbeam
journal, December 2017


Energetic proton generation in ultra-intense laser–solid interactions
journal, February 2001

  • Wilks, S. C.; Langdon, A. B.; Cowan, T. E.
  • Physics of Plasmas, Vol. 8, Issue 2, p. 542-549
  • DOI: 10.1063/1.1333697

Towards manipulating relativistic laser pulses with micro-tube plasma lenses
journal, March 2016

  • Ji, L. L.; Snyder, J.; Pukhov, A.
  • Scientific Reports, Vol. 6, Issue 1
  • DOI: 10.1038/srep23256

Numerical study of pair creation by ultraintense lasers
journal, May 2002

  • Nakashima, Ken’ichi; Takabe, Hideaki
  • Physics of Plasmas, Vol. 9, Issue 5
  • DOI: 10.1063/1.1464145

Acceleration of a trailing positron bunch in a plasma wakefield accelerator
journal, October 2017