Physics of beam self-modulation in plasma wakefield accelerators

Lotov, K. V.

doi:10.1063/1.4933129

Cited by 51 publications

(90 citation statements)

References 40 publications

Supporting

Mentioning

Contrasting

Order By: Relevance

“…The difference is especially large for the first 4 meters. As the SMI grows, the effective wakefield phase velocity is slower than that of the drive bunch [49,65,66] as seen in Fig. 7.…”

Section: Phase Velocity Issuesmentioning

confidence: 95%

“…The high energy gain is only possible in a longitudinally nonuniform plasma with a small density step in the region of instability growth [48]. The density step modifies the beam evolution in such a way that the beam shape stops changing at the moment of full microbunching [49]. Otherwise the beam selforganization will not stop at microbunching and will proceed to destroy the microbunches soon after the maximum field is reached.…”

Section: The Self-modulation Instabilitymentioning

confidence: 99%

See 1 more Smart Citation

Path to AWAKE: Evolution of the concept

Caldwell

Adli

Amorim

et al. 2016

Nuclear Instruments and Methods in Physics Research Section A:

View full text Add to dashboard Cite

This report describes the conceptual steps in reaching the design of the AWAKE experiment currently under construction at CERN. We start with an introduction to plasma wakefield acceleration and the motivation for using proton drivers. We then describe the self-modulation instability -a key to an early realization of the concept. This is then followed by the historical development of the experimental design, where the critical issues that arose and their solutions are described. We conclude with the design of the experiment as it is being realized at CERN and some words on the future outlook. A summary of the AWAKE design and construction status as presented in this conference is given in [1].

show abstract

“…The difference is especially large for the first 4 meters. As the SMI grows, the effective wakefield phase velocity is slower than that of the drive bunch [49,65,66] as seen in Fig. 7.…”

Section: Phase Velocity Issuesmentioning

confidence: 95%

Section: The Self-modulation Instabilitymentioning

confidence: 99%

Path to AWAKE: Evolution of the concept

Caldwell

Adli

Amorim

et al. 2016

Nuclear Instruments and Methods in Physics Research Section A:

View full text Add to dashboard Cite

show abstract

“…A similar backward drift of the potential wells has been already studied for the self-modulation instability 11 . In our analysis on the other hand we are able to address as the responsible mechanism of this drift the growth of the front of the bunch due to the emittance-driven force, since all the others time dependencies of the system have been discarded.…”

Section: Evolution Of the Equilibrium Configurationmentioning

confidence: 92%

Characterization of the equilibrium configuration for modulated beams in a plasma wakefield accelerator

Martorelli

Pukhov

2016

Physics of Plasmas

View full text Add to dashboard Cite

We analyze the equilibrium configuration for a modulated beam with sharp boundaries exposed to the fields self-generated by the interaction with a plasma. Through a semi-analytical approach we show the presence of multiple equilibrium configurations and we determine the one more suitable for wakefield excitation. Once pointed out the absence of confinement for the front of the beam and the consequently divergence driven by the emittance, we study the evolution of the equilibrium configuration while propagating in the plasma, discarding all the others time-dependencies. We show the onset of a rigid backward drift of the equilibrium configuration and we provide an explanation in the increasing length of the first bunch.

show abstract

“…Therefore, the multiple proton bunches are preferably generated by longitudinal modulation 68 instead of the radial self-modulation 15,16 from a long proton bunch. The reason behind it is that the self-modulation gives rise to large radial momenta of the microbunches 21 .…”

Section: Figmentioning

confidence: 99%

“…The transverse wakefield of the beam leads to rippling of the beam itself, which further amplifies the plasma waves. Because of this positive feedback, the long proton bunch transforms into a train of micro-bunches that follow equidistantly at the plasma wavelength [19][20][21] . With proper seeding, the axisymmetric mode develops quickly and suppresses destructible non-axisymmetric modes like the hosing instability [22][23][24] .…”

Section: Introductionmentioning

confidence: 99%

Multi-proton bunch driven hollow plasma wakefield acceleration in the nonlinear regime

Xia

Lotov

et al. 2017

Physics of Plasmas

View full text Add to dashboard Cite

Proton-driven plasma wakefield acceleration has been demonstrated in simulations to be capable of accelerating particles to the energy frontier in a single stage, but its potential is hindered by the fact that currently available proton bunches are orders of magnitude longer than the plasma wavelength. Fortunately, proton micro-bunching allows driving plasma waves resonantly. In this paper, we propose using a hollow plasma channel for multiple proton bunch driven plasma wakefield acceleration and demonstrate that it enables the operation in the nonlinear regime and resonant excitation of strong plasma waves. This new regime also involves beneficial features of hollow channels for the accelerated beam (such as emittance preservation and uniform accelerating field) and long buckets of stable deceleration for the drive beam. The regime is attained at a proper ratio among plasma skin depth, driver radius, hollow channel radius, and micro-bunch period.

show abstract

Physics of beam self-modulation in plasma wakefield accelerators

Cited by 51 publications

References 40 publications

Path to AWAKE: Evolution of the concept

Path to AWAKE: Evolution of the concept

Characterization of the equilibrium configuration for modulated beams in a plasma wakefield accelerator

Multi-proton bunch driven hollow plasma wakefield acceleration in the nonlinear regime

Contact Info

Product

Resources

About