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Full Record Details
Persistent URL
http://purl.org/net/epubs/work/27304728
Record Status
Checked
Record Id
27304728
Title
Intra-pulse transition between ion acceleration mechanisms in intense laser-foil interactions
Contributors
H Padda (SUPA Department of Physics)
,
M King (SUPA Department of Physics)
,
RJ Gray (University of Strathclyde)
,
HW Powell (SUPA Department of Physics)
,
B Gonzalez-Izquierdo (SUPA Department of Physics)
,
LC Stockhausen (Centro de Laseres Pulsados (CLPU))
,
R Wilson (SUPA Department of Physics)
,
DC Carroll (STFC Rutherford Appleton Lab.)
,
RJ Dance (SUPA Department of Physics)
,
DA MacLellan (SUPA Department of Physics)
,
XH Yuan (Key Laboratory for Laser Plasmas (Ministry of Education) and Department of Physics and Astronomy)
,
NMH Butler (SUPA Department of Physics)
,
R Capdessus (SUPA Department of Physics)
,
M Borghesi (Centre for Plasma Physics)
,
D Neely (STFC Rutherford Appleton Lab.)
,
P McKenna (University of Strathclyde)
Abstract
Multiple ion acceleration mechanisms can occur when an ultrathin foil is irradiated with an intense laser pulse, with the dominant mechanism changing over the course of the interaction. Measurement of the spatial-intensity distribution of the beam of energetic protons is used to investigate the transition from radiation pressure acceleration to transparency-driven processes. It is shown numerically that radiation pressure drives an increased expansion of the target ions within the spatial extent of the laser focal spot, which induces a radial deflection of relatively low energy sheath-accelerated protons to form an annular distribution. Through variation of the target foil thickness, the opening angle of the ring is shown to be correlated to the point in time transparency occurs during the interaction and is maximized when it occurs at the peak of the laser intensity profile. Corresponding experimental measurements of the ring size variation with target thickness exhibit the same trends and provide insight into the intra-pulse laser-plasma evolution.
Organisation
CLF
,
CI
,
STFC
Keywords
Funding Information
EPSRC
(EP/J003832/1, EP/L001357/1, EP/K022415/1, EP/M018091/1 and EP/L000237/1);
STFC
(ST/K502340/1);
AFRL
(FA8655-13-1-3008)
Related Research Object(s):
Licence Information:
Language
English (EN)
Type
Details
URI(s)
Local file(s)
Year
Journal Article
Phys Plasmas
23, no. 6 (2016): 063116.
doi:10.1063/1.4954654
2016
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