Betatron radiation diagnostics for AWAKE Run 2

Williamson, B.; Xia, Guoxing; Gessner, Spencer; Petrenko, Alexey; Farmer, John; Pukhov, A.

doi:10.1016/j.nima.2020.164076

Cited by 9 publications

(15 citation statements)

References 17 publications

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“…The correlation between betatron radiation and the electron dynamics has shown that we might be able to use betatron radiation to indirectly measure the evolution of the beam size or even beam profile inside the plasma tube. However, as also shown by this work and the previous study [16], there are several difficulties in the study and the application of betatron diagnostics for proton wakefield acceleration experiments. The main problem from the physical side is the acceleration-leaded witness beam evolution, which then changes the characteristics of the betatron radiation emitted at each moment along the acceleration path.…”

Section: Discussionmentioning

confidence: 61%

“…Additionally, the divergence term Θ(θ d ) can be retrieved from the correlation between θ d and r β . However, as aforementioned, the evolution of the electron beam energy and its transverse profile during the acceleration may prohibit us to reconstruct the beam profile with this simple analytical model if the measured radiation is integrated over multiple betatron periods as in the case of AWAKE [16]. A spectrometer that can resolve the single period emission (sub-fs) or a model that considers the electron beam evolution is required.…”

Section: Betatron Radiation In Plasma Ion Columnmentioning

confidence: 99%

“…Due to the aforementioned deficiencies of the conventional beam diagnostic methods as well as the challenging diagnostic environment along the beam propagation direction in AWAKE, a non-invasive beam diagnostic method for electron bunches in plasma is needed. A preliminary study [16] has examined the possibility of using the betatron radiation to reconstruct the accelerated electron bunch's transverse profile. However, it has been shown that the evolving beam properties due to acceleration make it difficult to retrieve the beam profile and emittance via those methods for shortdistance laser wakefield acceleration (LWFA) based experiments [17,18].…”

Section: Introductionmentioning

confidence: 99%

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Simulation study of betatron radiation in AWAKE Run 2 experiment

Liang¹,

Xia²,

Saberi³

et al. 2022

Preprint

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The spectroscopy of betatron radiation from the focusing plasma column can work as a powerful non-invasive beam diagnostic method for plasma wakefield acceleration experiments such as the AWAKE. In this paper, the effects of radial size mismatch and off-axis injection on the beam dynamics, as well as the spectral features of the betatron radiation emitted by the witness electron bunch in the quasi-linear proton-driven plasma wakefield are studied. It is shown that the evolution of the critical betatron photon energy and the overall photon angular distribution can effectively reveal the initial injection conditions of the witness electron bunch. The possibility of using this method for the diagnostics of the seed electron bunch in the proton self-modulation stage of AWAKE Run 2 is also discussed.

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Section: Discussionmentioning

confidence: 61%

Section: Betatron Radiation In Plasma Ion Columnmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

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Simulation study of betatron radiation in AWAKE Run 2 experiment

Liang¹,

Xia²,

Saberi³

et al. 2022

Preprint

View full text Add to dashboard Cite

show abstract

“…The correlation between BR and the electron dynamics has shown that we may possibly use BR to indirectly get information about the evolution of the electron beam. However, as shown by this work and the previous study (Williamson et al 2020), there are several difficulties in the application of betatron diagnostics for the AWAKE. FIGURE 7.…”

Section: Discussionmentioning

confidence: 64%

Characteristics of betatron radiation in AWAKE Run 2 experiment

et al. 2023

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The oscillating relativistic electrons in the accelerating/focusing wakefields of plasma accelerators emit electromagnetic radiation known as betatron radiation (BR). The proton-driven plasma wakefield acceleration has been demonstrated in the Advanced Wakefield Experiment (AWAKE) at CERN; however, its accompanying radiation emission is less explored compared with those in the laser- and electron beam-driven plasma accelerators. In this paper, a detailed simulation study of BR in the AWAKE is presented. Considering the new set-up of the AWAKE Run 2 (2021–), the radiation emission from both the witness electron beam and the seeding electron beam is investigated using particle-in-cell simulations. The influence of radial size mismatch and misaligned off-axis injection on the witness beam dynamics, as well as the spectral features of the relevant BR are studied. These non-ideal electron injections are likely to occur in experiment. The proton self-modulation stage is also investigated with a close look at the seeding electron beam dynamics and its BR. As a footprint of the emitting particles, BR can provide valuable information about the beam dynamics. Some practical challenges to implement the betatron diagnostic in the AWAKE Run 2 experiment are also addressed.

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“…The betatron radiation signal is accessible due to the large radiation flux generated by relativistic beams in plasmas. Betatron radiation diagnostics have been utilized in inverse Compton scattering experiments [15], and studied in proton-driven PWFA experiments at AWAKE [16,17]. While the implementation of betatron radiation diagnostics was attempted at FACET, the high emittance of the beams prevented it from meeting its full potential.…”

Section: Introductionmentioning

confidence: 99%

Modeling betatron radiation using particle-in-cell codes for plasma wakefield accelerator diagnostics

Yadav¹,

Hansel²,

Naranjo³

et al. 2023

Preprint

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The characterization of plasma wakefield acceleration experiments using emitted photons from betatron radiation requires numerical models in support of instrumentation of single-shot, doubledifferential angular-energy spectra. Precision characterization for relevant experiments necessitates covering a wide energy range extending from tens of keV through 10 GeV, with an angular resolution on the order of 100 µrad. In this paper, we present a numerical model for betatron radiation from plasma accelerated beams, that are based on integration of LinardWiechert (LW) potentials for computed particle trajectories. The particle trajectories are generated in three different ways: first, by particle tracking through idealized fields in the blowout regime of PWFA; second, by obtaining trajectories from the Quasi-static Particle-in-Cell (PIC) code QuickPIC; and third, by obtaining trajectories from the full PIC code OSIRIS. We performed various benchmarks with analytical expressions and the PIC code EPOCH, which uses a Monte-Carlo QED radiation model. Finally, we present simulations of the expected betatron radiation for parameters from the Facility for Advanced Accelerator Experimental Tests II (FACET-II) PWFA and plasma photocathode experiments.

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Betatron radiation diagnostics for AWAKE Run 2

Cited by 9 publications

References 17 publications

Simulation study of betatron radiation in AWAKE Run 2 experiment

Simulation study of betatron radiation in AWAKE Run 2 experiment

Characteristics of betatron radiation in AWAKE Run 2 experiment

Modeling betatron radiation using particle-in-cell codes for plasma wakefield accelerator diagnostics

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