Quantum Effects for Parametric X-ray Radiation during Channeling: Theory and First Experimental Observation
K. B. Korotchenko, Yu. L. Pivovarov, Y. Takabayashi+
Department of Theoretical and Experimental Physics, National Research Tomsk Polytechnic University, 634050 Tomsk, Russia
+SAGA Light Source, 8-7 Yayoigaoka, Tosu, Saga 841-0005, Japan
Abstract
The theory of x-ray radiation from relativistic channeled electrons
at the Bragg angles - parametric x-radiation (PXR) during channeling (PXRC) - is
developed while accounting for two quantum effects: the initial population of bound states
of transverse motion and
the transverse "form-factor" of channeled electrons. An experiment was conducted using
a 255 MeV electron beam from a linac at the SAGA Light Source. We have identified a
difference in the angular distributions of PXR and PXRC and obtained a fairly good
agreement between the theoretical and experimental results.