Buffered high charge spectrally-peaked proton beams in the relativistic-transparency regime

N P Dover; C A J Palmer; M J V Streeter; H Ahmed; B Albertazzi; M Borghesi; D C Carroll; J Fuchs; R Heathcote; P Hilz; K F Kakolee; S Kar; R. Kodama; A Kon; D A MacLellan; P McKenna; S R Nagel; D Neely; M M Notley; M Nakatsutsumi; R Prasad; G Scott; M Tampo; M Zepf; J Schreiber; Z Najmudin

doi:10.1088/1367-2630/18/1/013038

Buffered high charge spectrally-peaked proton beams in the relativistic-transparency regime

N P Dover, C A J Palmer, M J V Streeter, H Ahmed, B Albertazzi, M Borghesi, D C Carroll, J Fuchs, R Heathcote, P Hilz, K F Kakolee, S Kar, R. Kodama, A Kon, D A MacLellan, P McKenna, S R Nagel, D Neely, M M Notley, M NakatsutsumiR Prasad, G Scott, M Tampo, M Zepf, J Schreiber, Z Najmudin

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Abstract

Spectrally-peaked proton beams of high charge (Ep » 8 MeV, DE » 4 MeV, N » 50 nC ) have been observed from the interaction of an intense laser (>1019 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 »8 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.

Original language	English
Article number	013038
Number of pages	8
Journal	New Journal of Physics
Volume	18
DOIs	https://doi.org/10.1088/1367-2630/18/1/013038
Publication status	Published - 18 Jan 2016

Keywords

high intensity lasers
proton beams
micron thick foils

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10.1088/1367-2630/18/1/013038

Dover-etal-NJOP-2016-Buffered-high-charge-spectrally-peaked-proton-beams-in-the-relativisticFinal published version, 1.35 MBLicence: CC BY 4.0

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Dover, N. P., Palmer, C. A. J., Streeter, M. J. V., Ahmed, H., Albertazzi, B., Borghesi, M., Carroll, D. C., Fuchs, J., Heathcote, R., Hilz, P., Kakolee, K. F., Kar, S., Kodama, R., Kon, A., MacLellan, D. A., McKenna, P., Nagel, S. R., Neely, D., Notley, M. M., ... Najmudin, Z. (2016). Buffered high charge spectrally-peaked proton beams in the relativistic-transparency regime. New Journal of Physics, 18, Article 013038. https://doi.org/10.1088/1367-2630/18/1/013038

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title = "Buffered high charge spectrally-peaked proton beams in the relativistic-transparency regime",

abstract = "Spectrally-peaked proton beams of high charge (Ep » 8 MeV, DE » 4 MeV, N » 50 nC ) have been observed from the interaction of an intense laser (>1019 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 »8 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.",

keywords = "high intensity lasers, proton beams, micron thick foils",

author = "Dover, {N P} and Palmer, {C A J} and Streeter, {M J V} and H Ahmed and B Albertazzi and M Borghesi and Carroll, {D C} and J Fuchs and R Heathcote and P Hilz and Kakolee, {K F} and S Kar and R. Kodama and A Kon and MacLellan, {D A} and P McKenna and Nagel, {S R} and D Neely and Notley, {M M} and M Nakatsutsumi and R Prasad and G Scott and M Tampo and M Zepf and J Schreiber and Z Najmudin",

year = "2016",

month = jan,

day = "18",

doi = "10.1088/1367-2630/18/1/013038",

language = "English",

volume = "18",

journal = "New Journal of Physics",

issn = "1367-2630",

}

Dover, NP, Palmer, CAJ, Streeter, MJV, Ahmed, H, Albertazzi, B, Borghesi, M, Carroll, DC, Fuchs, J, Heathcote, R, Hilz, P, Kakolee, KF, Kar, S, Kodama, R, Kon, A, MacLellan, DA, McKenna, P, Nagel, SR, Neely, D, Notley, MM, Nakatsutsumi, M, Prasad, R, Scott, G, Tampo, M, Zepf, M, Schreiber, J & Najmudin, Z 2016, 'Buffered high charge spectrally-peaked proton beams in the relativistic-transparency regime', New Journal of Physics, vol. 18, 013038. https://doi.org/10.1088/1367-2630/18/1/013038

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 (Ep » 8 MeV, DE » 4 MeV, N » 50 nC ) have been observed from the interaction of an intense laser (>1019 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 »8 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 (Ep » 8 MeV, DE » 4 MeV, N » 50 nC ) have been observed from the interaction of an intense laser (>1019 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 »8 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 - high intensity lasers

KW - proton beams

KW - micron thick foils

UR - http://iopscience.iop.org/article/10.1088/1367-2630/18/1/013038?fromSearchPage=true

U2 - 10.1088/1367-2630/18/1/013038

DO - 10.1088/1367-2630/18/1/013038

M3 - Article

SN - 1367-2630

VL - 18

JO - New Journal of Physics

JF - New Journal of Physics

M1 - 013038

ER -

Buffered high charge spectrally-peaked proton beams in the relativistic-transparency regime

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Advanced laser-ion acceleration strategies towards next generation healthcare

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Buffered high charge spectrally-peaked proton beams in the relativistic-transparency regime

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Advanced laser-ion acceleration strategies towards next generation healthcare

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