Abstract
By using a thick (250 mu m) target with 350 mu m radius of curvature, the intense proton beam driven by a petawatt laser is focused at a distance of similar to 1 mm from the target for all detectable energies up to similar to 25 MeV. The thickness of the foil facilitates beam focusing as it suppresses the dynamic evolution of the beam divergence caused by peaked electron flux distribution at the target rear side. In addition, reduction in inherent beam divergence due to the target thickness relaxes the curvature requirement for short-range focusing. Energy resolved mapping of the proton beam trajectories from mesh radiographs infers the focusing and the data agree with a simple geometrical modeling based on ballistic beam propagation.
| Original language | English |
|---|---|
| Article number | 225003 |
| Number of pages | 4 |
| Journal | Physical Review Letters |
| Volume | 106 |
| Issue number | 22 |
| DOIs | |
| Publication status | Published - 2 Jun 2011 |
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Keywords
- acceleration
- irradiation
- generation
- targets
Cite this
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Ballistic focusing of polyenergetic protons driven by petawatt laser pulses. / Kar, S.; Markey, K.; Borghesi, M.; Carroll, D. C.; McKenna, P.; Neely, D.; Quinn, M. N.; Zepf, M.
In: Physical Review Letters, Vol. 106, No. 22, 225003, 02.06.2011.Research output: Contribution to journal › Article
TY - JOUR
T1 - Ballistic focusing of polyenergetic protons driven by petawatt laser pulses
AU - Kar, S.
AU - Markey, K.
AU - Borghesi, M.
AU - Carroll, D. C.
AU - McKenna, P.
AU - Neely, D.
AU - Quinn, M. N.
AU - Zepf, M.
PY - 2011/6/2
Y1 - 2011/6/2
N2 - By using a thick (250 mu m) target with 350 mu m radius of curvature, the intense proton beam driven by a petawatt laser is focused at a distance of similar to 1 mm from the target for all detectable energies up to similar to 25 MeV. The thickness of the foil facilitates beam focusing as it suppresses the dynamic evolution of the beam divergence caused by peaked electron flux distribution at the target rear side. In addition, reduction in inherent beam divergence due to the target thickness relaxes the curvature requirement for short-range focusing. Energy resolved mapping of the proton beam trajectories from mesh radiographs infers the focusing and the data agree with a simple geometrical modeling based on ballistic beam propagation.
AB - By using a thick (250 mu m) target with 350 mu m radius of curvature, the intense proton beam driven by a petawatt laser is focused at a distance of similar to 1 mm from the target for all detectable energies up to similar to 25 MeV. The thickness of the foil facilitates beam focusing as it suppresses the dynamic evolution of the beam divergence caused by peaked electron flux distribution at the target rear side. In addition, reduction in inherent beam divergence due to the target thickness relaxes the curvature requirement for short-range focusing. Energy resolved mapping of the proton beam trajectories from mesh radiographs infers the focusing and the data agree with a simple geometrical modeling based on ballistic beam propagation.
KW - acceleration
KW - irradiation
KW - generation
KW - targets
UR - http://www.scopus.com/inward/record.url?scp=79960643834&partnerID=8YFLogxK
U2 - 10.1103/PhysRevLett.106.225003
DO - 10.1103/PhysRevLett.106.225003
M3 - Article
VL - 106
JO - Physical Review Letters
JF - Physical Review Letters
SN - 0031-9007
IS - 22
M1 - 225003
ER -