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Particles, Volume 6, Issue 3
September 2023 - 15 articles
Cover Story: Smith–Purcell radiation (SPR), which is generated when electrons pass just above a metal grating, is expected to be used for nondestructive measurements of the longitudinal bunch shape. To obtain information on the bunch shape from coherent SPR spectra, it is necessary to know the SPR spectrum from a single electron. We reconsidered the conventional surface current model and performed 3-D numerical calculations to take into account the geometric shading effects for the model. The cover figure shows images of induced surface currents with (near) and without (far) shading effects. The calculation results show that shading effects have a significant impact on the SPR intensity calculations, which is consistent with our measurements of angular distribution and polarization of coherent SPR. View this paper
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