Diffracted diffraction radiation and its application to beam diagnostics

Abstract

We present theoretical considerations for diffracted diffraction radiation and also propose an application of this process to diagnosing ultra-relativistic electron (positron) beams for the first time. Diffraction radiation is produced when relativistic particles move near a target. If the target is a crystal or X-ray mirror, diffraction radiation in the X-ray region is expected to be diffracted at the Bragg angle and therefore be detectable. We present a scheme for applying this process to measurements of the beam angular spread, and consider how to conduct a proof-of-principle experiment for the proposed method.

Visible light from modulated electron beam moving between twin circular silver nanowires forming plasmonic photonic molecule

“…Today this effect is considered to be a particular case of more broadly defined phenomenon: the radiation that occurs if the charged particles or their beams excite nearby material objects without touching them, in various frequency regions. Such an effect is called diffraction radiation (DR) [5][6][7][8][9][10][11][12][13][14], in order to distinguish it from the transient radiation appearing when a particle crosses a boundary between different materials. Physically, the sources of DR are the surface and polarization currents induced on the scatterers placed in proximity to the beam trajectory.…”

“…Microwave-range DR is already in use as an attractive technique for non-invasive beam diagnostics, i.e. remote sensing of the beam position and velocity [10][11][12][13][14]. Such sensors are usually called beam position monitors (BPM).…”