Physics – High Energy Physics – High Energy Physics - Experiment
Scientific paper
2005-12-07
Phys.Rev.ST Accel.Beams 11:041001,2008
Physics
High Energy Physics
High Energy Physics - Experiment
23 pages, 27 figures, 2 tables, REVTeX4 two columns
Scientific paper
10.1103/PhysRevSTAB.11.041001
The processes of coherent bremsstrahlung (CB) and coherent pair production (CPP) based on aligned crystal targets have been studied in the energy range 20-170 GeV. The experimental arrangement allowed for measurements of single photon properties of these phenomena including their polarization dependences. This is significant as the theoretical description of CB and CPP is an area of active theoretical debate and development. With the theoretical approach used in this paper both the measured cross sections and polarization observables are predicted very well. This indicates a proper understanding of CB and CPP up to energies of 170 GeV. Birefringence in CPP on aligned crystals is applied to determine the polarization parameters in our measurements. New technologies for high energy photon beam optics including phase plates and polarimeters for linear and circular polarization are demonstrated in this experiment. Coherent bremsstrahlung for the strings-on-strings (SOS) orientation yields a larger enhancement for hard photons than CB for the channeling orientations of the crystal. Our measurements and our calculations indicate low photon polarizations for the high energy SOS photons.
Apyan Armen
Avakian R. O.
Badelek Barbara
Ballestrero S.
Biino Cristina
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