Enhancement of ion generation in femtosecond ultraintense laser-foil interactions by defocusing

Xu, Ming; Li, Y. T.; Carroll, D. C.; Foster, P. S.; Hawkes, S.; Kar, S.; Liu, F.; Markey, K.; McKenna, P.; Streeter, M. J. V.; Spindloe, C.; Sheng, Zheng-Ming; Wahlström, Claes‐Göran; Zepf, Matthew; Zheng, Jian; Zhang, J.; Neely, D.

doi:10.1063/1.3688027

Cited by 13 publications

(7 citation statements)

References 22 publications

(9 reference statements)

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“…It is noteworthy that the 5% efficiency is achieved with 10 18 -W cm −2 intensity. As reported in refs 53 and 54 , the large focal spot is one of the reasons explaining the high CE in this study.…”

Section: Resultssupporting

confidence: 76%

Boosting laser-ion acceleration with multi-picosecond pulses

Yogo

Mima

Iwata

et al. 2017

Sci Rep

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Using one of the world most powerful laser facility, we demonstrate for the first time that high-contrast multi-picosecond pulses are advantageous for proton acceleration. By extending the pulse duration from 1.5 to 6 ps with fixed laser intensity of 1018 W cm−2, the maximum proton energy is improved more than twice (from 13 to 33 MeV). At the same time, laser-energy conversion efficiency into the MeV protons is enhanced with an order of magnitude, achieving 5% for protons above 6 MeV with the 6 ps pulse duration. The proton energies observed are discussed using a plasma expansion model newly developed that takes the electron temperature evolution beyond the ponderomotive energy in the over picoseconds interaction into account. The present results are quite encouraging for realizing ion-driven fast ignition and novel ion beamlines.

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Section: Resultssupporting

confidence: 76%

Boosting laser-ion acceleration with multi-picosecond pulses

Yogo

Mima

Iwata

et al. 2017

Sci Rep

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“…Increasing the focal spot size not only decreases the laser intensity, but also lowers the intensity of the pulse pedestal responsible for pre-plasma generation. A lower intensity pre-plasma decreases the electron density but more importantly it decreases the pre-plasma electron temperature 27 . The cold electron temperature is expected to scale linearly with the laser intensity 28 .…”

Section: Resultsmentioning

confidence: 99%

Compact acceleration of energetic neutral atoms using high intensity laser-solid interaction

Dalui

Trivikram

Colgan

et al. 2017

Sci Rep

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Recent advances in high-intensity laser-produced plasmas have demonstrated their potential as compact charge particle accelerators. Unlike conventional accelerators, transient quasi-static charge separation acceleration fields in laser produced plasmas are highly localized and orders of magnitude larger. Manipulating these ion accelerators, to convert the fast ions to neutral atoms with little change in momentum, transform these to a bright source of MeV atoms. The emittance of the neutral atom beam would be similar to that expected for an ion beam. Since intense laser-produced plasmas have been demonstrated to produce high-brightness-low-emittance beams, it is possible to envisage generation of high-flux, low-emittance, high energy neutral atom beams in length scales of less than a millimeter. Here, we show a scheme where more than 80% of the fast ions are reduced to energetic neutral atoms and demonstrate the feasibility of a high energy neutral atom accelerator that could significantly impact applications in neutral atom lithography and diagnostics.

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“…Increasing the focal spot size not only decreases the laser intensity, but also lowers the intensity of the pulse pedestal responsible for pre-plasma generation. A lower intensity pre-plasma decreases the electron density but more importantly it decreases the pre-plasma electron temperature 25 . The cold electron temperature is expected to scale linearly with the laser intensity 26 .…”

Section: Resultsmentioning

confidence: 99%

Mass selection in laser-plasma ion accelerator on nanostructured surfaces

et al. 2017

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Recent advances in high-intensity laser-produced plasmas have demonstrated their potential as compact charge particle accelerators. Unlike conventional accelerators, transient quasi-static charge separation acceleration fields in laser produced plasmas are highly localized and orders of magnitude larger. Manipulating these ion accelerators, to covert the fast ions to neutral atoms with little change in momentum, transform these to a bright source of MeV atoms. The emittance of the neutral atom beam would be similar to that expected for an ion beam. Since intense laser-produced plasmas have been demonstrated to produce high-brightness-low-emittance beams, it is possible to envisage generation of high-flux, low-emittance, high energy neutral atom beams in length scale of less than a milimeter. Here, we show a scheme where more than 80% of the fast ions are reduced to energetic neutral atoms and demonstrate the feasibility of a high energy neutral atom accelerator that could significantly impact applications in neutral atom lithography and diagnostics.

show abstract

Enhancement of ion generation in femtosecond ultraintense laser-foil interactions by defocusing

Cited by 13 publications

References 22 publications

Boosting laser-ion acceleration with multi-picosecond pulses

Boosting laser-ion acceleration with multi-picosecond pulses

Compact acceleration of energetic neutral atoms using high intensity laser-solid interaction

Mass selection in laser-plasma ion accelerator on nanostructured surfaces

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