New higher-brilliance sources of infrared synchrotron radiation

A new mechanism for the emission of infrared synchrotron radiation (IRSR) is observed following the longitudinal acceleration or deceleration of relativistic particles when leaving or entering a magnetic field (edges of dipole or undulator). This emission may present significant advantages in terms of brilliance and intensity compared to the emission by constant field acceleration (center of the magnet). A full numerical integration of the electrodynamic fields have allowed a complete review of the main characteristics of two sources of the 0.8 GeV ring Super-AGO (Orsay, France): a dipole edge and an undulator. The intensity of the emission (flux), brilliance, spatial distribution (asymmetry of the source), dependence of the emission on the magnetic field and polarisation have been evaluated for the emission in the infrared range. These parameters are compared with equivalent measurements providing a confirmation of the theoretical predictions.