Diffraction radiation from relativistic electron bunches.
Gallet, Michael James
Buskirk, Fred R.
Neighbors, John R.
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Diffraction radiation is that electromagnetic energy which is caused by a relativistic charged particle passing through an aperture in an opaque material. Ter-Mikaelian solved for the diffraction radiation from appoint charge. This paper discusses the phenomena resulting from finite, relativistic charge bunches. Using the Huygens-Fresnel principle, diffraction patterns from spherical and cylindrical charge distributions are found and plotted. For charge bunch sizes less than the radiation wavelength, the results are almost identical to those for point charges. The radiation pattern is composed of two regions. The "transition region" is characterized by a strong peak at 0=γˉ¹, the Lorentz factor. The "diffraction region" consists of a series of peaks and nulls in field strength typical of the standard plane wave diffraction pattern.
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