ENHANCEMENT OF THE LINEAR-POLARIZATION OF COHERENT BREMSSTRAHLUNG BY COLLIMATION OF THE PHOTON-BEAM

A method is described to precisely predict the relative intensities an d degrees of linear polarization of coherent bremsstrahlung from diamo nd crystals, taking into account the collimation of the photon beam an d the lateral distribution and angular divergence of the electron beam in addition to the properties of the crystal. It is confirmed that th e increase of the degree of linear polarization through collimation of the photon beam is a sizable effect. Compared to previous approaches considerable progress has been made in reproducing the experimentally observed relative intensities of collimated coherent bremsstrahlung, b y taking into account the angular distribution of coherent bremsstrahl ung in full detail. For the predicted degree of linear polarization ag reement with experimental data from MAMI (Mainz) is obtained on a grea ter than or similar to 3% level of precision.