Multi-Stage Ion Acceleration in Laser Plasma Interaction

Enhancement of the quality of laser wake-field accelerated (LWFA) electron beams implies the improvement and controllability of the properties of the wake waves generated by ultra-short pulse lasers in underdense plasmas. In this work we present a compendium of useful formulas giving relations between the laser and plasma target parameters allowing one to obtain basic dependences, e.g. the energy scaling of the electrons accelerated by the wake field excited in inhomogeneous media including multi-stage LWFA accelerators. Consideration of the effects of using the chirped laser pulse driver allows us to find the regimes where the chirp enhances the wake field amplitude. We present an analysis of the three-dimensional effects on the electron beam loading and on the unlimited LWFA acceleration in inhomogeneous plasmas. Using the conditions of electron trapping to the wake-field acceleration phase we analyse the multi-equal stage and multiuneven stage LWFA configurations. In the first configuration the energy of fast electrons is a linear function of the number of stages, and in the second case, the accelerated electron energy grows exponentially with the number of stages. The results of the two-dimensional particle-in-cell simulations presented here show the high quality electron acceleration in the triple stage injection-acceleration configuration.

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“…We note here that multi-stage laser ion accelerator configurations have been analysed in Kawata et al (2014Kawata et al ( , 2016.…”

Section: Introductionmentioning

confidence: 99%

On some theoretical problems of laser wake-field accelerators

et al. 2016

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“…In order to pre-accelerate the protons to relativistic speeds in the RPA stage, however, an ultraintense laser pulse (≥ 10 22 W/cm 2 ) is usually required, which would crucially postpone the realization of this scheme in experiments. In addition to the RPA-LWFA hybrid scheme, it was also proposed to enhance the ion energies and/or the ion beam qualities in laser-driven ion acceleration by using some multi-stage schemes [25][26][27][28][29][30][31][32][33] or phase-matched scheme 34 .…”

Section: Introductionmentioning

confidence: 99%

Efficient injection of radiation-pressure-accelerated sub-relativistic protons into laser wakefield acceleration based on 10 PW lasers

et al. 2018

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1We propose a hybrid laser-driven ion acceleration scheme using a combination target of a solid foil and a density-tailored background plasma. In the first stage, a sub-relativistic proton beam can be generated by the radiation pressure acceleration in the intense laser interaction with the solid foil. In the second stage, this sub-relativistic proton beam is further accelerated by the laser wakefield driven by the same laser pulse in a near-critical-density background plasma with a decreasing density profile. The propagating velocity of the laser front and the phase velocity of the excited wakefield wave are effectively lowered at the beginning of the second stage. By decreasing the background plasma density gradually from near critical density along the laser propagation direction, the wake travels faster and faster while it accelerates the protons. Consequently, the dephasing between the protons and the wake is postponed, and an efficient wakefield proton acceleration is achieved. This hybrid laser-driven proton acceleration scheme can be realized by using ultrashort laser pulses at the peak power of 10 PW for the generation of multi-GeV proton beams.

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“…In addition to individual acceleration schemes, some hybrid schemes [13][14][15] or cascaded 2 schemes [16][17][18][19][20][21][22][23][24] have also been proposed for enhancing the ion energies in laser-driven ion acceleration. Recently, the efficient generation of protons with energies exceeding 94 MeV by a combination of the RPA and TNSA mechanisms has been demonstrated in the experiment 15 .…”

Section: Introductionmentioning

confidence: 99%

Ion beam bunching via phase rotation in cascading laser-driven ion acceleration

et al. 2018

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The ion beam bunching in a cascaded target normal sheath acceleration is investigated by theoretical analysis and particle-in-cell simulations. It is found that a proton beam can be accelerated and bunched simultaneously by injecting it into the rising sheath field at the rear side of a laser-irradiated foil target. In the rising sheath field, the ion phase rotation may take place since the back-end protons of the beam feels a stronger field than the front-end protons. Consequently, the injected proton beam can be compressed in the longitudinal direction. At last, the vital role of the ion beam bunching is illustrated by the integrated simulations of two successive stages in a cascaded acceleration.

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Multi-Stage Ion Acceleration in Laser Plasma Interaction

Cited by 3 publications

References 8 publications

On some theoretical problems of laser wake-field accelerators

On some theoretical problems of laser wake-field accelerators

Efficient injection of radiation-pressure-accelerated sub-relativistic protons into laser wakefield acceleration based on 10 PW lasers

Ion beam bunching via phase rotation in cascading laser-driven ion acceleration

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