Coherent Smith-Purcell radiation for minimally invasive bunch length measurement at the subpicosecond time scale

Heil, Philipp; Aulenbacher, K.; Matejcek, Christoph; Friederich, Simon; Bruker, Max; Fichtner, Frank

doi:10.1103/physrevaccelbeams.24.042803

Cited by 5 publications

(3 citation statements)

References 9 publications

(9 reference statements)

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“…The most applications of the Smith-Purcell radiation use the coherent regime with the radiation intensity proportional to the square of the number of particles in the bunch (see, for example, [25,26]). Coherent effects in the radiation of electron bunches flying over static and dynamical periodic interfaces were studied in [22,27,28].…”

Section: Issca-2023mentioning

confidence: 99%

Radiation processes on acoustic superlattices

Saharian,

Grigoryan,

Khachatryan

et al. 2023

J. Phys.: Conf. Ser.

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We describe several radiation processes in media excited by volume and surface acoustic waves. They include the Cherenkov and transition radiations on acoustic superlattices, transition radiation on an interface with a dynamical periodic structure, the Smith-Purcell radiation on surface waves, bremsstrahlung of high-energy electrons and the creation of electron-positron pairs by high energy photons in crystals in the presence of hypersonic waves. The conditions on the parameters of acoustic fields are specified under which their influence is essential. All these considerations show that the acoustic waves can serve as an efficient mechanism to control the parameters of various kinds of radiation processes.

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Section: Issca-2023mentioning

confidence: 99%

Radiation processes on acoustic superlattices

Saharian,

Grigoryan,

Khachatryan

et al. 2023

J. Phys.: Conf. Ser.

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“…A reliable theoretical spectrum corresponding to the measurement conditions must be known when deriving the bunch form factor using coherent radiation. So far, some attempts have been made to measure bunch lengths from a few picoseconds to several hundred femtoseconds using coherent SPR [6,7]. The surface current (SC) model has been used as one of the methods to evaluate the theoretical spectrum of SPR.…”

Section: Introductionmentioning

confidence: 99%

“…Particles 2023, 5, FOR PEER REVIEW 2 several hundred femtoseconds using coherent SPR [6,7]. The surface current (SC) model has been used as one of the methods to evaluate the theoretical spectrum of SPR.…”

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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