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:
- 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 Name: New Journal of Physics Journal Volume: 21 Journal Issue: 10; Journal ID: ISSN 1367-2630
- Publisher:
- IOP Publishing
- Country of Publication:
- United Kingdom
- 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 Kingdom: 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 Kingdom. https://doi.org/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 Kingdom. https://doi.org/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 Kingdom},
year = {Tue Sep 24 00:00:00 EDT 2019},
month = {Tue Sep 24 00:00:00 EDT 2019}
}
https://doi.org/10.1088/1367-2630/ab4721
Web of Science
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