Target normal sheath acceleration with a large laser focal diameter
Abstract
In this work, the dependence of the laser-driven ion acceleration from thin titanium foils in the Target Normal Sheath Acceleration (TNSA) regime on target and laser parameters is explored using two dimensional particle-in-cell simulations. The oblique incidence (θL = 45°) and large focal spot size (w0 = 40μm) are chosen to take an advantage of quasi one-dimensional geometry of sheath fields and effective electron heating. This interaction setup also reveals low and achromatic angular divergence of a proton beam. It is shown that the hot electron temperature deviates from the ponderomotive scaling for short laser pulses and small pre-plasmas. This deviation is mainly due to the laser sweeping, as the short duration laser pulse each moment in time effectively heats only a fraction of a focal spot on the foil. This instantaneous partial heating results in an electron temperature deviation from the ponderomotive scaling and, thus, lower maximum proton energies than it could have been expected from the TNSA theory.
- Authors:
-
[1];
[1];
[1];
[1];
[1];
[1];
- Lawrence Berkeley National Lab. (LBNL), Berkeley, CA (United States)
- Publication Date:
- Research Org.:
- Lawrence Berkeley National Laboratory (LBNL), Berkeley, CA (United States)
- Sponsoring Org.:
- USDOE Office of Science (SC), High Energy Physics (HEP); USDOE Office of Science (SC), Fusion Energy Sciences (FES)
- OSTI Identifier:
- 1825487
- Alternate Identifier(s):
- OSTI ID: 1737700
- Grant/Contract Number:
- AC02-05CH11231; 17-SC-20-SC
- Resource Type:
- Accepted Manuscript
- Journal Name:
- Physics of Plasmas
- Additional Journal Information:
- Journal Volume: 27; Journal Issue: 12; Journal ID: ISSN 1070-664X
- Publisher:
- American Institute of Physics (AIP)
- Country of Publication:
- United States
- Language:
- English
- Subject:
- 70 PLASMA PHYSICS AND FUSION TECHNOLOGY; Femtosecond lasers; Particle-in-cell method; Computational physics; Particle acceleration
Citation Formats
Park, J., Bin, J. H., Steinke, S., Ji, Q., Bulanov, S. S., Thévenet, M., Vay, J. -L., Schenkel, T., Geddes, C. R., Schroeder, C. B., and Esarey, E. Target normal sheath acceleration with a large laser focal diameter. United States: N. p., 2020.
Web. doi:10.1063/5.0020609.
Park, J., Bin, J. H., Steinke, S., Ji, Q., Bulanov, S. S., Thévenet, M., Vay, J. -L., Schenkel, T., Geddes, C. R., Schroeder, C. B., & Esarey, E. Target normal sheath acceleration with a large laser focal diameter. United States. https://doi.org/10.1063/5.0020609
Park, J., Bin, J. H., Steinke, S., Ji, Q., Bulanov, S. S., Thévenet, M., Vay, J. -L., Schenkel, T., Geddes, C. R., Schroeder, C. B., and Esarey, E. Mon .
"Target normal sheath acceleration with a large laser focal diameter". United States. https://doi.org/10.1063/5.0020609. https://www.osti.gov/servlets/purl/1825487.
@article{osti_1825487,
title = {Target normal sheath acceleration with a large laser focal diameter},
author = {Park, J. and Bin, J. H. and Steinke, S. and Ji, Q. and Bulanov, S. S. and Thévenet, M. and Vay, J. -L. and Schenkel, T. and Geddes, C. R. and Schroeder, C. B. and Esarey, E.},
abstractNote = {In this work, the dependence of the laser-driven ion acceleration from thin titanium foils in the Target Normal Sheath Acceleration (TNSA) regime on target and laser parameters is explored using two dimensional particle-in-cell simulations. The oblique incidence (θL = 45°) and large focal spot size (w0 = 40μm) are chosen to take an advantage of quasi one-dimensional geometry of sheath fields and effective electron heating. This interaction setup also reveals low and achromatic angular divergence of a proton beam. It is shown that the hot electron temperature deviates from the ponderomotive scaling for short laser pulses and small pre-plasmas. This deviation is mainly due to the laser sweeping, as the short duration laser pulse each moment in time effectively heats only a fraction of a focal spot on the foil. This instantaneous partial heating results in an electron temperature deviation from the ponderomotive scaling and, thus, lower maximum proton energies than it could have been expected from the TNSA theory.},
doi = {10.1063/5.0020609},
journal = {Physics of Plasmas},
number = 12,
volume = 27,
place = {United States},
year = {Mon Dec 21 00:00:00 EST 2020},
month = {Mon Dec 21 00:00:00 EST 2020}
}
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