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Title: Proton beam emittance growth in multipicosecond laser-solid interactions

Abstract

High intensity laser-solid interactions can accelerate high energy, low emittance proton beams via the target normal sheath acceleration (TNSA) mechanism. Such beams are useful for a number of applications, including time-resolved proton radiography for basic plasma and high energy density physics studies. In experiments using the OMEGA EP laser system, we perform the first measurements of TNSA proton beams generated by up to 100 ps, kilojoule-class laser pulses with relativistic intensities. By systematically varying the laser pulse duration, we measure degradation of the accelerated proton beam quality as the pulse length increases. Two dimensional particle-in-cell simulations and simple scaling arguments suggest that ion motion during the rise time of the longer pulses leads to extended preformed plasma expansion from the rear target surface and strong filamentary field structures which can deflect ions away from uniform trajectories and therefore lead to large emittance growth.

Authors:
ORCiD logo [1];  [2]; ORCiD logo [1];  [1]; ORCiD logo [1]; ORCiD logo [1]; ORCiD logo [1]
  1. Univ. of Michigan, Ann Arbor, MI (United States). Center for Ultrafast Optical Science
  2. Univ. of Rochester, NY (United States). Lab. for Laser Energetics
Publication Date:
Research Org.:
Univ. of Michigan, Ann Arbor, MI (United States)
Sponsoring Org.:
USDOE National Nuclear Security Administration (NNSA)
OSTI Identifier:
1570017
Alternate Identifier(s):
OSTI ID: 1566833
Grant/Contract Number:  
NA0002372; NA0002727
Resource Type:
Published Article
Journal Name:
New Journal of Physics
Additional Journal Information:
Journal Volume: 21; Journal Issue: 10; Journal ID: ISSN 1367-2630
Publisher:
IOP Publishing
Country of Publication:
United States
Language:
English
Subject:
70 PLASMA PHYSICS AND FUSION TECHNOLOGY; high-intensity lasers; ion acceleration; plasma physics

Citation Formats

Campbell, Paul T., Canning, D., Hussein, A. E., Ratnayaka, K. D. W., Thomas, A. G. R., Krushelnick, K., and Willingale, L. Proton beam emittance growth in multipicosecond laser-solid interactions. United States: N. p., 2019. Web. doi:10.1088/1367-2630/ab4721.
Campbell, Paul T., Canning, D., Hussein, A. E., Ratnayaka, K. D. W., Thomas, A. G. R., Krushelnick, K., & Willingale, L. Proton beam emittance growth in multipicosecond laser-solid interactions. United States. doi:10.1088/1367-2630/ab4721.
Campbell, Paul T., Canning, D., Hussein, A. E., Ratnayaka, K. D. W., Thomas, A. G. R., Krushelnick, K., and Willingale, L. Tue . "Proton beam emittance growth in multipicosecond laser-solid interactions". United States. doi:10.1088/1367-2630/ab4721.
@article{osti_1570017,
title = {Proton beam emittance growth in multipicosecond laser-solid interactions},
author = {Campbell, Paul T. and Canning, D. and Hussein, A. E. and Ratnayaka, K. D. W. and Thomas, A. G. R. and Krushelnick, K. and Willingale, L.},
abstractNote = {High intensity laser-solid interactions can accelerate high energy, low emittance proton beams via the target normal sheath acceleration (TNSA) mechanism. Such beams are useful for a number of applications, including time-resolved proton radiography for basic plasma and high energy density physics studies. In experiments using the OMEGA EP laser system, we perform the first measurements of TNSA proton beams generated by up to 100 ps, kilojoule-class laser pulses with relativistic intensities. By systematically varying the laser pulse duration, we measure degradation of the accelerated proton beam quality as the pulse length increases. Two dimensional particle-in-cell simulations and simple scaling arguments suggest that ion motion during the rise time of the longer pulses leads to extended preformed plasma expansion from the rear target surface and strong filamentary field structures which can deflect ions away from uniform trajectories and therefore lead to large emittance growth.},
doi = {10.1088/1367-2630/ab4721},
journal = {New Journal of Physics},
number = 10,
volume = 21,
place = {United States},
year = {2019},
month = {9}
}

Journal Article:
Free Publicly Available Full Text
Publisher's Version of Record
DOI: 10.1088/1367-2630/ab4721

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