Features of a PXR source at a 100 MeV linac in θ-2θ target-to-detector arrangement were numerically simulated on the base of general expressions taking into account diffracted x-ray transition radiation (DTR) and interference between PXR and DTR. We have calculated x-ray intensities and polarization in symmetric Laue geometry for Bragg angles from 2 through 45 degrees. Thickness of Si target of 0.01 and 0.001 cm, detector aperture of 0.01 rad and x-ray energy resolution of 0.05 were accepted. Wide range x-ray energy tuning with minor intensity variation may be obtained using crystal target of optimal thickness that is close to the Bremsstrahlung coherence length. Calculations of the asymmetric case have shown considerable x-ray intensity increase due to the choice of optimal absorption of the emitted x-ray quanta. Dynamical effects expressed in appearance of the peculiarities in the PXR spectral-angular and angular distributions were also observed both for symmetric and asymmetric generation geometries. It could be important for a PXR source use, especially for experiments with high resolution x-ray diffractometry.

Date Published: 2 May 2007
PDF: 8 pages
Proc. SPIE 6634, International Conference on Charged and Neutral Particles Channeling Phenomena II, 663415 (2 May 2007); doi: 10.1117/12.741933

Published in SPIE Proceedings Vol. 6634:
International Conference on Charged and Neutral Particles Channeling Phenomena II
Sultan B. Dabagov, Editor(s)