Emittance preservation of an electron beam in a loaded quasilinear plasma wakefield

Olsen, V. K. Berglyd; Adli, E.; Muggli, P.

doi:10.1103/physrevaccelbeams.21.011301

Cited by 34 publications

(42 citation statements)

References 27 publications

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“…The increase of either of these two parameters will further lead to higher wakefield amplitudes, and hence to larger energy gains by trailing electrons. In the future, we will seek further optimization towards a higher accelerated beam quality, for example by including the witness beam emittance and beam loading effects in PIC simulations of the entire injection and acceleration process (see for example [22]).…”

Section: Discussionmentioning

confidence: 99%

Influence of proton bunch parameters on a proton-driven plasma wakefield acceleration experiment

Moreira

Vieira

Muggli

2019

Phys. Rev. Accel. Beams

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We use particle-in-cell (PIC) simulations to study the effects of variations of the incoming 400 GeV proton bunch parameters on the amplitude and phase of the wakefields resulting from a seeded selfmodulation (SSM) process. We find that these effects are largest during the growth of the SSM, i.e. over the first five to six meters of plasma with an electron density of 7 × 10 14 cm −3 . However, for variations of any single parameter by ±5%, effects after the SSM saturation point are small. In particular, the phase variations correspond to much less than a quarter wakefield period, making deterministic injection of electrons (or positrons) into the accelerating and focusing phase of the wakefields in principle possible. We use the wakefields from the simulations and a simple test electron model to estimate the same effects on the maximum final energies of electrons injected along the plasma, which are found to be below the initial variations of ±5%. This analysis includes the dephasing of the electrons with respect to the wakefields that is expected during the growth of the SSM. Based on a PIC simulation, we also determine the injection position along the bunch and along the plasma leading to the largest energy gain. For the parameters taken here (ratio of peak beam density to plasma density n b0 /n0 ≈ 0.003), we find that the optimum position along the proton bunch is at ξ ≈ −1.5 σ zb , and that the optimal range for injection along the plasma (for a highest final energy of ∼1.6 GeV after 10 m) is 5-6 m.

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Section: Discussionmentioning

confidence: 99%

Influence of proton bunch parameters on a proton-driven plasma wakefield acceleration experiment

Moreira

Vieira

Muggli

2019

Phys. Rev. Accel. Beams

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“…Run 2c will require an additional plasma cell, to be installed downstream of the self-modulation cell, and a new electron beam, which will be injected between the two cells. This configuration will avoid interference between the self-modulation and acceleration processes, and it will use two known effects, beam loading the longitudinal wakefield and full blowout of plasma electrons, to preserve the quality of the electron beam [9].…”

Section: Run 2: Goals and Milestonesmentioning

confidence: 99%

Recent highlights and plans of the AWAKE experiment

Porta¹

2021

Proceedings of 40th International Conference on High Energy Physics — PoS(ICHEP2020)

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The Advanced Wakefield Experiment (AWAKE) is an accelerator R&D experiment at CERN using, for the first time, a high-energy proton bunch to drive wakefields in plasma and accelerating electrons to the GeV energy scale. The principle of the AWAKE experiment is described. We show experimental results of the seeded self-modulation process of the long 400 GeV SPS proton bunch, transforming the bunch into a train of micro-bunches and driving resonantly the wakefields in the 10 m long Rb plasma. We also show that externally-injected electrons can be accelerated by these wakefields to several GeV. The next steps of the AWAKE experimental program are shown. Possible first applications to high-energy physics experiments, where the scheme takes advantage of the large energy stored in the proton bunch to reach very high energy gain in a single plasma, are described.

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“…In AWAKE Run 2, the two-dimensional transverse normalised emittance ε * n will be preserved at its injected value by matching the electron beam to the plasma, while the final relative energy spread σ γ f / γ f will be kept to the %-level by beamloading the proton-driven wakefield. Beam parameters to meet these conditions were previously determined by Olsen et al (2018) [14].…”

Section: Awake Runmentioning

confidence: 99%

Betatron radiation diagnostics for AWAKE Run 2

Williamson

Xia

Gessner

et al. 2020

Nuclear Instruments and Methods in Physics Research Section A:

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This is a PDF file of an article that has undergone enhancements after acceptance, such as the addition of a cover page and metadata, and formatting for readability, but it is not yet the definitive version of record. This version will undergo additional copyediting, typesetting and review before it is published in its final form, but we are providing this version to give early visibility of the article. Please note that, during the production process, errors may be discovered which could affect the content, and all legal disclaimers that apply to the journal pertain.

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Emittance preservation of an electron beam in a loaded quasilinear plasma wakefield

Cited by 34 publications

References 27 publications

Influence of proton bunch parameters on a proton-driven plasma wakefield acceleration experiment

Influence of proton bunch parameters on a proton-driven plasma wakefield acceleration experiment

Recent highlights and plans of the AWAKE experiment

Betatron radiation diagnostics for AWAKE Run 2

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