Observation of Plasma Focusing of a 28.5 GeV Positron Beam

Ng, J.; Chen, P.; Baldis, H. A.; Bolton, Paul R.; Cline, D.; Craddock, W.; Crawford, C.; Decker, F.‐J.; Field, C.; Fukui, Y.; Kumar, V.; Iverson, R.; King, F.; Kirby, R. E.; Nakajima, Kazuhisa; Noble, R.; Ogata, A.; Raimondi, P.; Walz, D.; Weidemann, A. W.

doi:10.1103/physrevlett.87.244801

Cited by 64 publications

(17 citation statements)

References 11 publications

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“…It is much easier to obtain high density with high energy beams, but it becomes more difficult to produce a well characterized short-dense plasma and achieve a high-demagnification underdense plasma lens. For example, Ng et al 11 produced a very strong lens and dense beam, n b Յ 2 ϫ 10 16 cm −3 , but could only achieve a modest factor of 2 beam area reduction at the focus and had little direct control over the plasma density which was largely produced through direct ionization by the beam.…”

Section: Introductionmentioning

confidence: 98%

Observations of low-aberration plasma lens focusing of relativistic electron beams at the underdense threshold

Thompson¹,

Badakov²,

Rosenzweig³

et al. 2010

Physics of Plasmas

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Focusing of a 15 MeV electron bunch by a plasma lens operated at the threshold of the underdense regime has been demonstrated. The strong, 1.7 cm focal length, plasma lens focused both transverse directions simultaneously and reduced the minimum area of the beam spot by a factor of 23. It is shown through analytic analysis and simulation that the observed spherical aberration of this underdense lens, when expressed as the fractional departure of the focusing strength from its linear expectation, is ⌬K / K = 0.08Ϯ 0.04. This is significantly lower than the minimum theoretical value for the spherical aberration of an overdense plasma lens. Parameter scans showing the dependence of focusing performance on beam charge, as well as time resolved measurements of the focused electron bunch, are reported.

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Section: Introductionmentioning

confidence: 98%

Observations of low-aberration plasma lens focusing of relativistic electron beams at the underdense threshold

Thompson¹,

Badakov²,

Rosenzweig³

et al. 2010

Physics of Plasmas

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“…In a plasma lens, the bunch travels into a gas jet, where it can ionize and radially expel the gas electronsthereby surrounding itself with a focusing ion cavity. This effect was studied theoretically [15][16][17][18] and experimentally [19][20][21][22][23][24], in the context of conventional accelerators. However, in a plasma lens, there is always a finite length at the bunch head over which the focusing is very nonuniform [18,21,24] (this effect typically gives rise to head erosion).…”

Section: Introductionmentioning

confidence: 99%

Laser-plasma lens for laser-wakefield accelerators

Lehe

Thaury

Guillaume

et al. 2014

Phys. Rev. ST Accel. Beams

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International audienceThanks to their compactness and unique properties, laser-wakefield accelerators are currently considered for several innovative applications. However, many of these applications—and especially those that require beam transport—are hindered by the large divergence of laser-accelerated beams. Here we propose a collimating concept that relies on the strong radial electric field of the laser-wakefield to reduce this divergence. This concept utilizes an additional gas jet, placed after the laser-wakefield accelerator. When the laser pulse propagates through this additional gas jet, it drives a wakefield which can refocus the trailing electron bunch. Particle-in-cell simulations demonstrate that this approach can reduce the divergence by at least a factor of 3 for realistic electron bunches

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“…The amplitude of the transverse force behind the bunch is considerably larger for the 2 nC bunch, indicating that the bunch induces strong focusing forces. It is important to note that these forces are always focusing inside the bunch, which is due to a magnetic self-pinching effect known as plasma lensing [23,24]. The influence of the bunch wakefields on the electron distribution can be seen from Figs.…”

Section: Beam Loading Effectsmentioning

confidence: 99%

Simulation of electron postacceleration in a two-stage laser wakefield accelerator

Reitsma

Leemans

Esarey

et al. 2002

Phys. Rev. ST Accel. Beams

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Electron bunches produced in self-modulated laser wakefield experiments usually have a broad energy distribution, with most electrons at low energy (1-3 MeV) and only a small fraction at high energy. We propose and investigate further acceleration of such bunches in a channel-guided resonant laser wakefield accelerator. Two-dimensional simulations with and without the effects of self-consistent beam loading are performed and compared. These results indicate that it is possible to trap about 40% of the injected bunch charge and accelerate this fraction to an average energy of about 50 MeV in a plasma channel of a few mm.

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Observation of Plasma Focusing of a 28.5 GeV Positron Beam

Cited by 64 publications

References 11 publications

Observations of low-aberration plasma lens focusing of relativistic electron beams at the underdense threshold

Observations of low-aberration plasma lens focusing of relativistic electron beams at the underdense threshold

Laser-plasma lens for laser-wakefield accelerators

Simulation of electron postacceleration in a two-stage laser wakefield accelerator

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