Conceptual design of a laser wakefield acceleration experiment with external bunch injection

Khachatryan, A.G.; Luttikhof, M.J.H.; Irman, Arie; Goor, F.A. van; Verschuur, Jeroen W.J.; Bastiaens, Hubertus M.J.; Boller, Klaus J.

doi:10.1016/j.nima.2006.07.007

Cited by 15 publications

(19 citation statements)

References 16 publications

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“…22,23 It used to be thought that such bunches would be necessary for the generation of ͑quasi-͒monoenergetic electrons bunches. However, recently, simulations and theory have been published 7,11,24 showing that bunches significantly longer than the plasma wavelength can still lead to the generation of electrons with low energy spread and a bunch length on the order of 10 fs. In this scenario, the plasma wave acts as a slicer and as a compressor in addition to an accelerator, as can be seen in Fig.…”

Section: B Electron Bunchesmentioning

confidence: 99%

“…In reality the emittance of the bunch and the space-charge forces inside the bunch will limit the minimum size to which the electrons can be focused. Based on previous investigations of realistic beamlines, 7,24 it can be shown that the electrons can be focused down to at least 30 m. That is the value will be assumed for the full width at half maximum ͑FWHM͒ of the Gaussian radial distribution so that both laser and electron bunch have the same spot size. The results are representative for other electron beam radii as long as the laser spot size and laser power are adjusted to maintain the same laser intensity and relative spot sizes compared to the ones presented here.…”

Section: B Electron Bunchesmentioning

confidence: 99%

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Parameter study of acceleration of externally injected electrons in the linear laser wakefield regime

et al. 2008

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A parameter study for laser wakefield acceleration is presented, in which externally injected electrons are accelerated in low amplitude plasma waves, represented by an analytical two-dimensional description. Results have been obtained for plasma densities up to 2.6 ϫ 10 24 m −3 , plasma lengths up to 300 mm, laser intensities up to 3.5ϫ 10 21 W / m 2 , and injection of Gaussian model bunches at energies up to 12 MeV. For the range of parameters studied, effects of laser depletion and the influence of the electron bunch on the plasma can be ignored. In the parameter space, a region is identified where final energies of over 100 MeV are reached, at an energy spread of less than 5% and a rms emittance of a few micrometers.

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Section: B Electron Bunchesmentioning

confidence: 99%

Section: B Electron Bunchesmentioning

confidence: 99%

Parameter study of acceleration of externally injected electrons in the linear laser wakefield regime

et al. 2008

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“…this bunch in a laser wakefield that is generated by a multi-TW laser in a plasma capillary through which the laser pulses are guided [21][22][23][24][25]. Our modeling of the experiment with the chosen and experimentally implemented design parameters suggests that the laser wake field accelerator can indeed be operated in the almost linear (only weakly non-linear) regime, where the accelerating wake field structure is more regular and robust.…”

Section: Challenges and The Applied Approachmentioning

confidence: 99%

“…To estimate the strength of such effects we consider an electron bunch longer than plasma wavelengths, provided according to our calculations by the linac (k p σ b = 2πσ b /λ p >> 1 where σ b is the injected bunch length and λ p is the plasma wavelength). The maximum plasma wakefield amplitude generated by the bunch itself E z,b0 can then be approximated by the expression [24] E z,b0 [ Table 4.1: Bunch parameters for the proof-of principle LWFA experiment with external injection in front of the laser pulse. The injected bunch charge is 5 pC.…”

Section: Laser Wakefield Accelerationmentioning

confidence: 99%

“…Recently, it was theoretically shown that the injection problem might be overcome by injecting electron bunches from conventional rf-linacs although it seemed that such bunches would be far too long (much longer than the plasma wavelength) [21][22][23][24][37][38][39][40][41][42]. In order to prepare a corresponding demonstration experiment at the University of Twente, we carried out a more detailed theoretical investigation of a novel bunch injection method.…”

Section: Introductionmentioning

confidence: 99%

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Integral design of a laser wakefield accelerator with external bunch injectioon

Irman¹

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Effect of the ponderomotive scattering and injection position on electron-bunch injection into a laser wakefield

et al. 2006

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For the purpose of laser wakefield acceleration, it turned out that also the injection of electron bunches longer than a plasma wavelength can generate accelerated femtosecond bunches with relatively low energy spread. This is of high interest because such injecting bunches can be provided, e.g., by state-of-the-art photo cathode RF guns. Here we point out that when an e-bunch is injected in the wakefield it is important to take into account the ponderomotive scattering of the injecting bunch by the laser pulse in the vacuum region located in front of the plasma. At low energies of the injected bunch this scattering results in a significant drop of the collection efficiency. Larger collection efficiency can by reached with lower intensity laser pulses and relatively high injection energies. We also estimate the minimum trapping energy for the injected electrons and the length of the trapped bunch.PACS numbers: 52.38. Kd, 41.75.Jv, 41.85.Ar In Laser Wakefield Accelerator (LWFA) a femtosecond high-power laser pulse generates a strong plasma wave (laser wakefield) which can accelerate charged particles to ultra-relativistic energies [1]. In order to avoid large energy spread in accelerated bunch when a relativistic electron bunch is injected in the laser wakefield, the bunch has to be injected at a suitable position in the wake with a precision of a fraction of the plasma wave period and the duration of the injected bunch has to be similarly short. For the plasma parameters of interest, which involves typical plasma wavelength of a few tens of microns, this requires initial bunches of the order of 10 femtoseconds duration and a similar precision of the synchronization with the wakefield. With current technologies these requirements cannot be fulfilled in practice. As an alternative, in the recently demonstrated "bubble" injection method [2] electrons from the background plasma are trapped in the correct phase of the wake yielding the required ultra-short bunches. This method led to acceleration to energies of

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Conceptual design of a laser wakefield acceleration experiment with external bunch injection

Cited by 15 publications

References 16 publications

Parameter study of acceleration of externally injected electrons in the linear laser wakefield regime

Parameter study of acceleration of externally injected electrons in the linear laser wakefield regime

Integral design of a laser wakefield accelerator with external bunch injectioon

Effect of the ponderomotive scattering and injection position on electron-bunch injection into a laser wakefield

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