Energetic Proton Generation in Ultra-Intense Laser-Solid Interactions

Wilks, S. C.; Langdon, A. B.; Cowan, T. E.; Roth, M.; Singh, M. S.; Hatchett, S.; Key, M.H.; Pennington, D. M.; Mackinnon, A. J.; Snavely, R.

doi:10.2172/793448

Cited by 107 publications

(175 citation statements)

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“…A prepulse, due to the laser amplification system and less energetic than the main pulse, creates the plasma on the surface of the target. When the main pulse arrives, it interacts preferentially with this plasma and a population of hot electrons with a Maxwellian-type distribution is generated [17]. These electrons traverse the target and build up a high electrostatic field, up to the order of TV/m, capable of accelerating the particles on the rear surface of the foil [10].…”

Section: Introductionmentioning

confidence: 99%

Dosimetry and spectral analysis of a radiobiological experiment using laser-driven proton beams

et al. 2011

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Abstract. Laser-driven proton and ion acceleration is an area of increasing research interest given the recent development of short pulse-high intensity lasers. Several groups have reported experiments to understand whether a laser-driven beam can be applied for radiobiological purposes and in each of these the method to obtain dose and spectral analysis was slightly different. The difficulty with these studies is that the very large instantaneous dose rate is a challenge for commonly used dosimetry techniques, so that other more sophisticated procedures need to be explored. This article aims to explain a method for obtaining the energetic spectrum and the dose of a laser-driven proton beam irradiating a cell dish used for radiobiology studies. The procedure includes the use of a magnet to have charge and energy separation of the laser driven beam, Gafchromic films to have information on dose and partially on energy, and a Monte Carlo code to expand the measured data in order to obtain specific details of the proton spectrum on the cells. Two specific correction factors have to be calculated: one to take in account the variation of dose response of the films as a function of the proton energy and the other to obtain the dose to the cell layer starting from the dose measured on the films. This method, particularly suited to irradiation delivered in a single laser shot, can be applied in any other radiobiological experiment performed with laser driven proton beams, with the only condition that the initial proton spectrum has to be at least roughly known.The method was tested in an experiment conducted at Queen's University of Belfast using the TARANIS laser, where the mean energy of the protons crossing the cells was between 0.9 and 5 MeV, the instantaneous dose rate was estimated to be close to 10 9 Gy/s and doses between 0.8-5 Gy were delivered to the cells in a single laser shot. The combination of the applied corrections modified the initial estimate of dose by up to 40% Dosimetry and spectral analysis of a radiobiological experiment using laser-driven proton beams2

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Section: Introductionmentioning

confidence: 99%

Dosimetry and spectral analysis of a radiobiological experiment using laser-driven proton beams

et al. 2011

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“…Ion acceleration from solid targets seems therefore to offer a more promising platform for energetic neutral atom generation. The interaction of high-intensity ultrashort laser-pulses accelerates ions along the target-normal direction by the target-normal-sheath-acceleration (TNSA) mechanism [14][15][16][17][18] . A high energy neutral atom source with the same emittance characteristics seen in ions generating from intense laser-produced plasma 19,20 would seem out of reach of conventional charge transfer methods of neutral atom generation.…”

Section: Figurementioning

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.

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“…By using curved targets the emission angle of the ion beam can be influenced. Concave targets can focus or collimate the whole ion beam [1,[10][11][12]. To achieve tailored spectra, especially monoenergetic ion beams, different approaches exist.…”

Section: Introductionmentioning

confidence: 99%

“…Recent investigations show that the ion beam can be manipulated by the use of special targets. Concave targets focus or collimate the whole ion beam [1,[10][11][12]. Manipulated target surfaces or microstructured targets can deliver quasi-monoenergetic ion and proton beams [13,14].…”

mentioning

confidence: 99%

Investigations of Field Dynamics in Laser Plasmas with Proton Imaging

Sokollik

2011

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Energetic Proton Generation in Ultra-Intense Laser-Solid Interactions

Cited by 107 publications

References 0 publications

Dosimetry and spectral analysis of a radiobiological experiment using laser-driven proton beams

Dosimetry and spectral analysis of a radiobiological experiment using laser-driven proton beams

Mass selection in laser-plasma ion accelerator on nanostructured surfaces

Investigations of Field Dynamics in Laser Plasmas with Proton Imaging

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