Polarization of Radiation from Planar Channeled Positrons

TL;DR

This paper derives the polarization characteristics of radiation emitted by relativistic positrons channeled in silicon crystals using quantum electrodynamics, with numerical results relevant for high-energy polarized photon sources.

Contribution

It provides a quantum electrodynamics framework for calculating polarization of channeling radiation from positrons in crystals, including numerical analysis for specific frequencies.

Findings

Degree of polarization depends on channeling radiation contribution

Numerical results for high-energy photon sources

Analysis focused on (110) silicon crystal planes

Abstract

The Stokes parameters have been found in the framework of quantum electrodynamics for the description of polarization of radiation emitted by relativistic positrons channeled between (110) planes in Si crystal. The degree of polarization, which is simply given by the contribution of channeling radiation, has been analyzed. Numerical calculation are presented for the frequencies that are most interesting for the sources of polarized high-energy photons.