Final published version
Research output: Contribution to Journal/Magazine › Journal article › peer-review
Research output: Contribution to Journal/Magazine › Journal article › peer-review
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TY - JOUR
T1 - Buffered high charge spectrally-peaked proton beams in the relativistic-transparency regime
AU - Dover, N. P.
AU - Palmer, C. A. J.
AU - Streeter, M. J. V.
AU - Ahmed, H.
AU - Albertazzi, B.
AU - Borghesi, M.
AU - Carroll, D. C.
AU - Fuchs, J.
AU - Heathcote, R.
AU - Hilz, P.
AU - Kakolee, K. F.
AU - Kar, S.
AU - Kodama, R.
AU - Kon, A.
AU - MacLellan, D. A.
AU - McKenna, P.
AU - Nagel, S. R.
AU - Neely, D.
AU - Notley, M. M.
AU - Nakatsutsumi, M.
AU - Prasad, R.
AU - Scott, G.
AU - Tampo, M.
AU - Zepf, M.
AU - Schreiber, J.
AU - Najmudin, Z.
PY - 2016/1/18
Y1 - 2016/1/18
N2 - Spectrally-peaked proton beams of high charge (E-p approximate to 8 MeV, Delta E approximate to 4 MeV, N approximate to 50 nC) have been observed from the interaction of an intense laser (> 10(19) W cm(-2)) with ultrathin CH foils, as measured by spectrally-resolved full beam profiles. These beams are reproducibly generated for foil thicknesses 5-100 nm, and exhibit narrowing divergence with decreasing target thickness down to approximate to 8 degrees for 5 nm. Simulations demonstrate that the narrow energy spread feature is a result of buffered acceleration of protons. The radiation pressure at the front of the target results in asymmetric sheath fields which permeate throughout the target, causing preferential forward acceleration. Due to their higher charge-to-mass ratio, the protons outrun a carbon plasma driven in the relativistic transparency regime.
AB - Spectrally-peaked proton beams of high charge (E-p approximate to 8 MeV, Delta E approximate to 4 MeV, N approximate to 50 nC) have been observed from the interaction of an intense laser (> 10(19) W cm(-2)) with ultrathin CH foils, as measured by spectrally-resolved full beam profiles. These beams are reproducibly generated for foil thicknesses 5-100 nm, and exhibit narrowing divergence with decreasing target thickness down to approximate to 8 degrees for 5 nm. Simulations demonstrate that the narrow energy spread feature is a result of buffered acceleration of protons. The radiation pressure at the front of the target results in asymmetric sheath fields which permeate throughout the target, causing preferential forward acceleration. Due to their higher charge-to-mass ratio, the protons outrun a carbon plasma driven in the relativistic transparency regime.
KW - laser-plasma interaction
KW - ion acceleration
KW - laser ion source
KW - proton acceleration
KW - ION-ACCELERATION
KW - PLASMA
KW - SOLIDS
U2 - 10.1088/1367-2630/18/1/013038
DO - 10.1088/1367-2630/18/1/013038
M3 - Journal article
VL - 18
JO - New Journal of Physics
JF - New Journal of Physics
SN - 1367-2630
M1 - 013038
ER -