Observation of High Transformer Ratio Plasma Wakefield Acceleration

Loisch, Gregor; Asova, G.; Boonpornprasert, Prach; Brinkmann, R.; Chen, Ye; Engel, Johannes; Good, James; Groß, Matthias; Grüner, F.; Huck, Holger; Kalantaryan, Davit; Krasilnikov, M.; Lishilin, Osip; Ossa, A. Martínez de la; Mehrling, Timon; Melkumyan, David; Oppelt, A.; Osterhoff, Jens; Qian, Houjun; Renier, Y.; Stephan, F.; Tenholt, C.; Wohlfarth, Valentin; Zhao, Quantang

doi:10.1103/physrevlett.121.064801

Cited by 57 publications

(32 citation statements)

References 30 publications

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“…Figure 6(d) shows an interesting case where the beam current decreases almost linearly towards the back of the beam, which makes it suitable for achieving high beam loading efficiency [38][39][40], whereas the current profile shown in Fig. 6(e) is useful for high transformer ratio [41][42][43][44] wakefield acceleration.…”

Section: Sensitivity Of Ramp Variations On Emittance and Currentmentioning

confidence: 99%

Effect of fluctuations in the down ramp plasma source profile on the emittance and current profile of the self-injected beam in a plasma wakefield accelerator

Zhang

Huang

Marsh

et al. 2019

Phys. Rev. Accel. Beams

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With its extreme beam parameters, the FACET II facility enables the test of the down ramp injection scheme in the laboratory for the beam-driven plasma wakefield accelerator approach. In addition to the ideal cases studied in previous theoretical work, we investigate the effect of fluctuations in the down ramp plasma source profile on the emittance and current profile of the self-injected beam using 2D and 3D particle-in-cell simulations. We show that down ramps with a length of ∼10 c=ω p can be reproducibly created by generating a shock in a supersonic flow. Simulations show that the emittance of the injected beam using such down ramps is ∼0.1 μm. A gentler ramp can further reduce the slice emittance of the beam to ∼0.03 μm. The emittance of the injected beam depends on the ramp length but is insensitive to the shape of the ramp. However, the current profile of the injected beam can be manipulated by changing the ramp shape. A simulation shows that, when a noncylindrical driver is used, the emittance of the injected beam differs in the two orthogonal transverse planes and is a few times larger than that of the cylindrical driver case. A full-scale simulation where we use a realistic density profile that includes the up ramp, the injecting down ramp, and the exiting down ramp is presented to show that the beam emittance is preserved during the acceleration and extraction of the beam.

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Section: Sensitivity Of Ramp Variations On Emittance and Currentmentioning

confidence: 99%

Effect of fluctuations in the down ramp plasma source profile on the emittance and current profile of the self-injected beam in a plasma wakefield accelerator

Zhang

Huang

Marsh

et al. 2019

Phys. Rev. Accel. Beams

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“…We consider an electron drive beam and a positron witness beam, both with Gaussian transverse profiles, propagating in a finite radius plasma, and demonstrate emittance preservation at the percent-level in a strongly loaded wakefield. Further optimization is possible, e.g., the emittance growth can be reduced by slice-by-slice matching of the witness beam to the focusing field [27], and, by proper shaping of drive and witness beams, the transformer ratio and thus efficiency can be increased [29,30]. The initial plasma profile may also be optimized.…”

Section: Discussionmentioning

confidence: 99%

Positron transport and acceleration in beam-driven plasma wakefield accelerators using plasma columns

Diederichs

Mehrling

Benedetti

et al. 2019

Phys. Rev. Accel. Beams

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A finite radius plasma is proposed to generate wakefields that can focus and accelerate positron beams in a plasma wakefield accelerator. The finite radius plasma reduces the restoring force acting on the plasma electrons forming the plasma wakefield, resulting in an elongation of the on-axis return point of the electrons and, hence, creating a long, high-density electron filament. This results in a region with accelerating and focusing fields for positrons, allowing for the acceleration and quality-preserving transport of high-charge positron beams.

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“…1. Reliable production of high quality electron beams by the PITZ gun along with its advanced beam diagnostics provides excellent opportunities for a wide field of interdisciplinary research activities [36,37,38,39,40]. More specific introduction of the gun, the booster cavity and the plasma cell at PITZ are given in the following subsections, respectively.…”

Section: Overview Of the Photo Injector Test Facility At Desy-zeuthenmentioning

confidence: 99%

Preliminary study for the laboratory experiment of cosmic-rays driven magnetic field amplification

Jao

Vafin

Chen

et al. 2019

High Energy Density Physics

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To understand astrophysical magnetic-field amplification, we conducted a feasibility study for a laboratory experiment of a nonresonant streaming instability at the Photo Injector Test Facility at DESY, Zeuthen site (PITZ). This non-resonant streaming instability, also known as Bell's instability, is generally regarded as a candidate for the amplification of interstellar magnetic field in the upstream region of supernova-remnant shocks, which is crucial for the efficiency of diffusive shock acceleration. In the beam-plasma system composed of a radio-frequency electron gun and a gas-discharge plasma cell, the goal of our experiment is to demonstrate the development of the non-resonant streaming instability and to find its saturation level in the laboratory environment. Since we find that the electron beam will be significantly decelerated on account of an electrostatic streaming instability, which will decrease the growth rate of desired non-resonant streaming instability, we discuss possible ways to suppress the electrostatic streaming instability by considering the characteristics of a field-emission-based quasi continuous-wave electron beam.

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Observation of High Transformer Ratio Plasma Wakefield Acceleration

Cited by 57 publications

References 30 publications

Effect of fluctuations in the down ramp plasma source profile on the emittance and current profile of the self-injected beam in a plasma wakefield accelerator

Effect of fluctuations in the down ramp plasma source profile on the emittance and current profile of the self-injected beam in a plasma wakefield accelerator

Positron transport and acceleration in beam-driven plasma wakefield accelerators using plasma columns

Preliminary study for the laboratory experiment of cosmic-rays driven magnetic field amplification

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