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      Two-Pulse Ionization Injection into Quasi-Linear Laser Wakefields

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          Abstract

          We describe a scheme for controlling electron injection into the quasi-linear wakefield driven by a guided drive pulse via ionization of a dopant species by a collinear injection laser pulse with a short Rayleigh range. The scheme is analyzed by particle in cell simulations which show controlled injection and acceleration of electrons to an energy of 370 MeV, a relative energy spread of 2%, and a normalized transverse emittance of 3.0 {\mu}m. This is an arXiv version of the original APS paper. It should be cited as N. Bourgeois, J. Cowley, and S. M. Hooker, Phys. Rev. Lett. 111, 155004 (2013). APS link here: http://link.aps.org/doi/10.1103/PhysRevLett.111.155004

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          Laser Electron Accelerator

          T Tajima, J Dawson (1979)
          Article 0 comments Cited 1140 times – based on 0 reviews     Review now
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            A laser-plasma accelerator producing monoenergetic electron beams.

            J. Faure, Y Glinec, A Pukhov … (2004)
            Particle accelerators are used in a wide variety of fields, ranging from medicine and biology to high-energy physics. The accelerating fields in conventional accelerators are limited to a few tens of MeV m(-1), owing to material breakdown at the walls of the structure. Thus, the production of energetic particle beams currently requires large-scale accelerators and expensive infrastructures. Laser-plasma accelerators have been proposed as a next generation of compact accelerators because of the huge electric fields they can sustain (>100 GeV m(-1)). However, it has been difficult to use them efficiently for applications because they have produced poor-quality particle beams with large energy spreads, owing to a randomization of electrons in phase space. Here we demonstrate that this randomization can be suppressed and that the quality of the electron beams can be dramatically enhanced. Within a length of 3 mm, the laser drives a plasma bubble that traps and accelerates plasma electrons. The resulting electron beam is extremely collimated and quasi-monoenergetic, with a high charge of 0.5 nC at 170 MeV.
            Article 0 comments Cited 594 times – based on 0 reviews     Review now
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              Controlled injection and acceleration of electrons in plasma wakefields by colliding laser pulses.

              J. Faure, C Rechatin, A Norlin … (2006)
              In laser-plasma-based accelerators, an intense laser pulse drives a large electric field (the wakefield) which accelerates particles to high energies in distances much shorter than in conventional accelerators. These high acceleration gradients, of a few hundreds of gigavolts per metre, hold the promise of compact high-energy particle accelerators. Recently, several experiments have shown that laser-plasma accelerators can produce high-quality electron beams, with quasi-monoenergetic energy distributions at the 100 MeV level. However, these beams do not have the stability and reproducibility that are required for applications. This is because the mechanism responsible for injecting electrons into the wakefield is based on highly nonlinear phenomena, and is therefore hard to control. Here we demonstrate that the injection and subsequent acceleration of electrons can be controlled by using a second laser pulse. The collision of the two laser pulses provides a pre-acceleration stage which provokes the injection of electrons into the wakefield. The experimental results show that the electron beams obtained in this manner are collimated (5 mrad divergence), monoenergetic (with energy spread <10 per cent), tuneable (between 15 and 250 MeV) and, most importantly, stable. In addition, the experimental observations are compatible with electron bunch durations shorter than 10 fs. We anticipate that this stable and compact electron source will have a strong impact on applications requiring short bunches, such as the femtolysis of water, or high stability, such as radiotherapy with high-energy electrons or radiography for materials science.
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                Author and article information

                Journal
                Publication date Created: 28 June 2013
                Publication date Updated: 2013-11-04
                Article
                DOI: 10.1103/PhysRevLett.111.155004
                ArXiV ID: 1306.6893
                SO-VID: 747206c1-b80e-43b3-a8db-df25126af156
                License:

                http://arxiv.org/licenses/nonexclusive-distrib/1.0/

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                Journal reference Phys. Rev. Lett. 111, 155004 (2013)
                Comments 5 pages, 4 figures
                Categories physics.plasm-ph

                ScienceOpen disciplines: Plasma physics
                Data availability:
                ScienceOpen disciplines: Plasma physics

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