Numerical study of self modulation instability of 1 nC electron bunch at ATF

Fang, Yun; Mori, W. B.; Muggli, P.

doi:10.1063/1.4773758

Cited by 3 publications

(2 citation statements)

References 6 publications

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“…Proposed and ongoing PD-PWFA experiments depend on the self-modulation instability to generate a microbunch drive train from a long proton bunch. Also, electron or positron beams, long with respect to the plasma wavelength, may self-modulate in a plasma [44,45]. Several experiments have been proposed and performed in order to study the SMI in electron and positron beams, since such beams have been more readily accessible at accelerator test facilities.…”

Section: Proof-of-principle Studiesmentioning

confidence: 99%

“…At the Brookhaven National Laboratory Accelerator Test Facility (ATF), an experiment to study the SMI as well as the seeding of the instability was performed [44]. In the experiment a 58 MeV electron bunch, about 1 mm long with a sharp rising edge, was sent into plasmas of varying densities, corresponding to 1-7 plasma wavelengths along the bunch.…”

Section: Proof-of-principle Studiesmentioning

confidence: 99%

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Proton-Beam-Driven Plasma Acceleration

Adli

Muggli

2016

Rev. Accl. Sci. Tech.

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We describe the main ideas, promises and challenges related to proton-driven plasma wakefield acceleration. Existing high-energy proton beams have the potential to accelerate electron beams to the TeV scale in a single plasma stage. In order to drive a wake effectively the available beams must be either highly compressed or microbunched. The self-modulation instability has been suggested as a way to microbunch the proton beams. The AWAKE project at CERN is currently the only planned proton-driven plasma acceleration experiment. A self-modulated CERN SPS beam will be used to drive a plasma wake. We describe the design choices and experimental setup for AWAKE, and discuss briefly the short-term objectives as well as longer-term ideas for the project.

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Section: Proof-of-principle Studiesmentioning

confidence: 99%

Section: Proof-of-principle Studiesmentioning

confidence: 99%

Proton-Beam-Driven Plasma Acceleration

Adli

Muggli

2016

Rev. Accl. Sci. Tech.

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Effect of beam emittance on self-modulation of long beams in plasma wakefield accelerators

Lotov

2015

Physics of Plasmas

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The initial beam emittance determines the maximum wakefield amplitude that can be reached as a result of beam self-modulation in the plasma. The wakefield excited by the fully self-modulated beam decreases linearly with the increase of the beam emittance. There is a value of initial emittance beyond which the selfmodulation does not develop even if the instability is initiated by a strong seed perturbation. The emittance scale at which the wakefield is twice suppressed with respect to the zero-emittance case (the so called critical emittance) is determined by inability of the excited wave to confine beam particles radially and is related to beam and plasma parameters by a simple formula. The effect of beam emittance can be observed in several discussed self-modulation experiments.

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Seeding of Self-Modulation Instability of a Long Electron Bunch in a Plasma

et al. 2014

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We demonstrate experimentally that a relativistic electron bunch shaped with a sharp rising edge drives plasma wakefields with one to seven periods along the bunch as the plasma density is increased. The plasma density is varied in the 10(15)-10(17) cm(-3) range. The wakefields generation is observed after the plasma as a periodic modulation of the correlated energy spectrum of the incoming bunch. We choose a low bunch charge of 50 pC for optimum visibility of the modulation at all plasma densities. The longitudinal wakefields creating the modulation are in the MV/m range and are indirect evidence of the generation of transverse wakefields that can seed the self-modulation instability, although the instability does not grow significantly over the short plasma length (2 cm). We show that the seeding provides a phase reference for the wakefields, a necessary condition for the deterministic external injection of a witness bunch in an accelerator. This electron work supports the concept of similar experiments in the future, e.g., SMI experiments using long bunches of relativistic protons.

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Numerical study of self modulation instability of 1 nC electron bunch at ATF

Cited by 3 publications

References 6 publications

Proton-Beam-Driven Plasma Acceleration

Proton-Beam-Driven Plasma Acceleration

Effect of beam emittance on self-modulation of long beams in plasma wakefield accelerators

Seeding of Self-Modulation Instability of a Long Electron Bunch in a Plasma

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