Author/Authors :
Ganenko، نويسنده , , V. and Brudvik، نويسنده , , J. and Burdeinyi، نويسنده , , D. and Fissum، نويسنده , , K. and Hansen، نويسنده , , K. and Isaksson، نويسنده , , L. and Livingston، نويسنده , , K. and Lundin، نويسنده , , M. and Morokhovskii، نويسنده , , Nuno V. and Nilsson، نويسنده , , B. and Pugachov، نويسنده , , D. and Schroder، نويسنده , , B. and Vashchenko، نويسنده , , G.، نويسنده ,
Abstract :
A linearly polarized photon beam has been produced at MAX-lab using the coherent bremsstrahlung of electrons with an energy of 192.6 MeV in a 0.1 mm thick diamond crystal. The intensity and shape of the coherent maxima and their dependence on the crystal orientation are similar to the features observed at higher electron energies (~ 1 GeV) and are well described by coherent bremsstrahlung theory. The linear polarization of the uncollimated beam at the coherent peak energy ≈50–60 MeV is about 20% and can be increased to 40–45% if collimation of half the characteristic angle is used. At present the degree of polarization is high enough to allow the study of polarization observables in photo-nuclear reactions at MAX-lab in the energy range from Giant Dipole Resonance up to ≈80 MeV.
Keywords :
Electrons , Coherent bremsstrahlung , Photon spectra , Diamond crystal , Crystal orientations , Polarization
