Abstract
Diffraction radiation (DR) can be described as the scattering or diffraction of pseudo-photons associated with the transverse electromagnetic field of a relativistic charged particle, when the particle passes through an aperture or near an object. DR is closely related to transition radiation (TR) which is produced when a charged particle crosses a boundary between media with different dielectric constants. DR is also associated with “beam loading” which occurs when beams pass through discontinuties in their transport lines. DR is very similar in its properties to TR, so that much of what has been developed for TR beam diagnostics can readily be adapted to DR diagnostics. We will present concepts for using DR as a compact, nondestructive diagnostic that can measure the beam divergence, beam profile, and thus emittance in real time. These concepts, together with the previously demonstrated use of DR for longitudinal bunch length measurement, make an attractive suite of noninterceptive, time-resolved diagnostics which parallel those based on TR.
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