Experimental observation of quasicerenkov radiation in the quartz single crystal

Effect of acoustic wave on the parametric X-ray generation by relativistic electrons in a crystal

“…In particular, it is possible to provide for a significant increase in the radiation yield as measured by a detector with a small angular aperture (0D < p), which is oriented in the direction of Bragg scattering. This possibility explains the results obtained in [12,13].…”

“…The obtained formulas describe PXR emission in a broad range of angles and frequencies and, in particular, provide a simple explanation of the experimentally observed effect [12,13].…”

“…O ur previous experimental investigations [12,13] showed an increase in the PXR yield w ith the acoustic wave power, but this phenom enon has not been given proper theoretical explanation so far. Polikarpov and Skadorov [10,11] theoretically studied fine dynamic features o f the resonant action o f acoustic waves on the PXR characteristics, which are m anifested only within narrow spectral and angular intervals and, hence, can not be used to explain the observed PXR yield enhancem ent [12,13].…”

“…In particular, the effect o f acoustic waves was studied w ith respect to the coherent bremsstrahlung radiation [ 1,2], coherent electron-positron pair production in a crystal [3,4], diffraction of free photons [5,6], X-ray transition radiation [7], and param etric X-ray (PXR) generation [8][9][10][11][12][13].…”

“…Polikarpov and Skadorov [10,11] theoretically studied fine dynamic features o f the resonant action o f acoustic waves on the PXR characteristics, which are m anifested only within narrow spectral and angular intervals and, hence, can not be used to explain the observed PXR yield enhancem ent [12,13].…”