Single shot, nondestructive monitor for longitudinal subpicosecond bunch profile measurements with femtosecond resolution

Konoplev, I. V.; Doucas, G.; Harrison, Hannah; Lancaster, Andrew; Zhang, H.

doi:10.1103/physrevaccelbeams.24.022801

Cited by 4 publications

(2 citation statements)

References 65 publications

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“…[14][15][16] Moreover, progress in coherent emission enables the enhancement of radiation intensity, [17,18] while graphene metasurface [19] and C-aperture nanostructures [20,21] have been reported to exploit the DOI: 10.1002/adom.202300274 phase and polarization states of SPR, where polarization properties are also investigated in charged particle beam profiling to distinguish the signal from background radiation. [22] In addition, utilizing photonsieve structures can provide the orbital angular momentum required to generate the vortex field. [23,24] Various theoretical models [25,26] have also explored in depth the azimuth dependencies of the SPR intensities and polarizations.…”

Section: Introductionmentioning

confidence: 99%

Chiral Smith–Purcell Radiation Light Source

Dang

Huang

Liu

et al. 2023

Advanced Optical Materials

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Smith–Purcell radiation (SPR) with broadly tunable spectra has attracted attention in light emission, and this free‐electron‐driven source shows great potential in illumination fields, such as terahertz sources, ultra‐compact light sources, free‐electron lasers, etc. However, it remains difficult to control the polarization properties of SPR and realize a free‐electron chiral light source. In this work, the chiral SPR with the maximum chirality (>40%) is acquired in a periodic stacked nanosquare light‐well, and the radiation chirality is manipulated by variations of the designed electron beam excitation positions. Furthermore, this work reveals that the chiroptical effect originates in the superposition of SPRs with different phases and polarization, which are derived from adjacent sidewalls. This work may deepen the comprehension of electron‐matter interaction and facilitate the development of compact electron‐driven chirality‐tunable source‐on‐chip, highlighting potential applications in photonic integration and binary data processing.

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Section: Introductionmentioning

confidence: 99%

Chiral Smith–Purcell Radiation Light Source

Dang

Huang

Liu

et al. 2023

Advanced Optical Materials

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“…Radiation emitted from electron bunches that are sufficiently shorter than the radiation wavelength causes "coherent enhancement", and the degree of enhancement strongly depends on the longitudinal distribution of electron bunches. This has led to attempts to measure bunch length in a single shot by simultaneously measuring the coherent SPR with multiple detectors placed at different radiation angles [2][3][4]. Especially for accelerators with low beam repetition rates, such as laser-plasma acceleration [5], the ability to obtain information on bunches on a beam nondestructively would be a great advantage in terms of efficient beam utilization.…”

Section: Introductionmentioning

confidence: 99%

Study of Coherent Smith–Purcell Radiation in the Terahertz Region Using Ultra-Short Electron Bunches

et al. 2023

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Smith–Purcell radiation (SPR) can be generated nondestructively, providing valuable applications in light sources and beam monitors. Coherent SPR is expected to enable single-shot measurements of very short bunch lengths on the fs scale. Since the reconstruction of the longitudinal bunch shape from the coherent SPR is based on the reliable SPR spectrum, a more detailed understanding of the properties of the radiation is important in this context. Employing a 100 fs ultrashort electron bunch at the t-ACTS test accelerator, the spectrum, angular distribution, and polarization of the produced coherent SPR were measured in the terahertz frequency region and compared with a model calculation. In addition to the widely known surface current model evaluation, the effect of the geometrical shading effect on induced currents on metal surfaces was evaluated using 3D numerical calculations. The obtained SPR characteristics are also presented. In the evaluation of the grating with a shallow blaze angle, it was found that the shading effect has a non-negligible effect on the generated SPR intensity; the measured angular distribution and polarization results were in good agreement with this result.

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