Radiation from Relativistic Electrons in Periodic Structures "RREPS-15"

Coherent Light Induced in Optical Fibers by a Charged Particle. Common Characteristics of Synchrotron Radiation and Light Escaping a Bent Fiber

10 Sept 2015, 12:30

30m

Invited 1. General Aspects of Physical Phenomena and Processes Associated with Electromagnetic Radiation 1. General Aspects of Physical Phenomena and Processes Associated with Electromagnetic Radiation

Speaker

Xavier Artru (Université de Lyon, Institut de Physique Nucléaire de Lyon, Université Lyon-I, CNRS/IN2P3, France)

Description

Two phenomena relating light channeled in optical fibers and radiation by moving particles are considered: the first one is light induced by a charged particle in optical fibers (PIGL). We review the basic mechanism, the intensity formula, the spectral and polarization properties and the possible application to beam diagnostic. The second one is a similarity between synchrotron radiation and light leaking from a bent fiber. The similarity concerns the tunneling mechanism by which the photon migrates from the particle trajectory – or the fiber – to the ‘‘light cylinder’’, the angular distribution and the impact parameter profile. The latter possesses the typical Airy fringes of a caustic. The relation between the minimum impact parameter of synchrotron radiation, the electron ``side-slipping'' and the Schott term of radiation damping theory is reviewed.