Laser triggered micro-lens for focusing and energy selection of MeV 
protons

Willi, O.; Toncian, T.; Borghesi, M.; Fuchs, Julien; d’Humières, E.; Antici, P.; Audebert, P.; Brambrink, E.; Cecchetti, C. A.; Pipahl, A.; Romagnani, L.

doi:10.1017/s0263034607070115

Cited by 24 publications

(15 citation statements)

References 21 publications

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“…The optical time delay between CPA1 and CPA2 was set so that a quasi-monoenergetic peak at 7 MeV could be measured in the magnetic spectrometer energy spectra. The protons which are almost exiting the lens when it is triggered feel the focusing fields just for a short time and are just only collimated by the micro-lens, 17,18 thus their divergence matched to the spectrometer entrance slit will produce an increase in the measured flux. Protons that are focused between the cylinder exit and the mesh will be projected with a magnification M higher than M 0 on the detector plane.…”

Section: B Focal Length Propertiesmentioning

confidence: 99%

“…However, as these proton beams are poly-energetic and divergent at source, reduction and control of their divergence and energy spread are essential requirements for most of these applications. Focusing and energy selection of a part of such poly-energetic and divergent proton beams have been demonstrated using a laser-driven micro-lens 17,18 or a static magnetic lens. 19,20 The first measurements of the laser driven micro-lens were reported in our earlier papers.…”

Section: Introductionmentioning

confidence: 99%

“…19,20 The first measurements of the laser driven micro-lens were reported in our earlier papers. 17,18 Here we describe a whole range of experimental and computational studies which contribute towards the understanding of the lens. Various aspects of the properties of this lens were investigated a currently at the National Institute of Optics, Pisa, Italy.…”

Section: Introductionmentioning

confidence: 99%

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Properties of a plasma-based laser-triggered micro-lens

et al. 2011

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This paper investigates the characteristic properties of a laser triggered micro-lens for focusing and energy selection of laser generated MeV proton and ion beams. Both experimental and computational studies that have been carried out leading to the understanding of the physical processes driving the micro-lens. After a one side irradiation of a hollow metallic cylinder a radial electric field develops inside the cylinder. Hot electrons generated by the interaction between laser pulse and cylinder wall spread inside the cylinder generating a plasma at the wall. This plasma expands into vacuum and sustains an electric field that acts as a collecting lens for proton or ion beams propagating axially through the cylinder. Various measurements including the reduction of the intrinsic beam divergence, the focusing quality, the energy selection and temporal response were carried out which contribute to the understanding of the lens properties. In addition, proton imaging was employed to study the electron transport inside the cylinder, revealing a transport along the wall surface. Each aspect studied experimentally is interpreted using 2D PIC and ray tracing simulations. A very good consistency between experimental and computational data was found.

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Section: B Focal Length Propertiesmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

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Properties of a plasma-based laser-triggered micro-lens

et al. 2011

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“…This suggested the idea of using a laser-irradiated hollow cylinder as a tool for varying the angular properties of a proton beam. Indeed the arrangement proved to work effectively as a laser driven micro-lens able to focus controllably laseraccelerated proton beams~Toncian et al, Willi et al, 2007!. Its operation was demonstrated in an experiment also carried out at the LULI Laboratory, employing the 100 TW laser operating in the CPA.…”

Section: Use Of Impulsive Electric Fields For Ion Beam Tailoringmentioning

confidence: 99%

Impulsive electric fields driven by high-intensity laser matter interactions

et al. 2007

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The interaction of high-intensity laser pulses with matter releases instantaneously ultra-large currents of highly energetic electrons, leading to the generation of highly-transient, large-amplitude electric and magnetic fields. We report results of recent experiments in which such charge dynamics have been studied by using proton probing techniques able to provide maps of the electrostatic fields with high spatial and temporal resolution. The dynamics of ponderomotive channeling in underdense plasmas have been studied in this way, as also the processes of Debye sheath formation and MeV ion front expansion at the rear of laser-irradiated thin metallic foils. Laser-driven impulsive fields at the surface of solid targets can be applied for energy-selective ion beam focusing.

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“…The generation of fast protons (Dong et al, 2003;Mora, 2003;Silva et al, 2004;Hegelich et al, 2006;Yin et al, 2006;Flippo et al, 2007;Willi et al, 2007) has been studied in many papers and the generation of quasi-monoenergetic protons is dominated Flippo et al, 2007;Willi et al, 2007). There are also many proton imaging techniques which allow the distribution of electromagnetic fields in plasmas and around laserirradiated targets to be explored Borghesi et al, 2001Borghesi et al, , 2002Borghesi et al, , 2003Borghesi et al, , 2005Borghesi et al, , 2007 and the density gradient of the laser-driven implosion target to be obtained using the angle deflection from the density impact on the protons (Mackinnon et al, 2006).…”

Section: Introductionmentioning

confidence: 99%

The diagnostics of density distribution for inhomogeneous dense DT plasmas using fast protons

Shen

Zhang

et al. 2008

Laser Part. Beams

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The density distribution of inhomogeneous dense deuterium-tritium plasmas in laser fusion is revealed by the energy loss of fast protons going through the plasma. In our simulation of a plasma density diagnostics, the fast protons used for the diagnostics may be generated in the laser-plasma interaction. Dividing a two-dimensional area into grids and knowing the initial and final energies of the protons, we can obtain a large linear and ill-posed equation set for the densities of all grids, which is solved with the Tikhonov regularization method. We find that the accuracy of the set plan with four proton sources is better than those of the set plans with less than four proton sources. Also we have done the density reconstruction especially for four proton sources with and without assuming circularly symmetrical density distribution, and find that the accuracy is better for the reconstruction assuming circular symmetry. The error is about 9% when no noise is added to the final energy for the reconstruction of four proton sources assuming circular symmetry. The accuracies for different random noises to final proton energies with four proton sources are also calculated.

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Laser triggered micro-lens for focusing and energy selection of MeV protons

Cited by 24 publications

References 21 publications

Properties of a plasma-based laser-triggered micro-lens

Properties of a plasma-based laser-triggered micro-lens

Impulsive electric fields driven by high-intensity laser matter interactions

The diagnostics of density distribution for inhomogeneous dense DT plasmas using fast protons

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