On the influence of acoustic waves on coherent bremsstrahlung in crystals

TL;DR

This paper explores how hypersonic acoustic waves affect the coherent bremsstrahlung process in crystals, deriving formulas and identifying conditions where these waves significantly alter the radiation emitted by relativistic electrons.

Contribution

It provides a new theoretical framework for understanding the impact of hypersonic vibrations on bremsstrahlung in crystals, including explicit formulas and specific conditions for their influence.

Findings

Hypersonic waves can enhance bremsstrahlung cross-section.

Hypersonic waves can also reduce bremsstrahlung cross-section.

The effect depends on wave parameters and electron entry angles.

Abstract

We investigate the coherent bremsstrahlung by relativistic electrons in a single crystal excited by hypersonic vibrations. The formula for the corresponding differential cross-section is derived in the case of a sinusoidal wave. The conditions are specified under which the influence of the hypersound is essential. The case is considered in detail when the electron enters into the crystal at small angles with respect to a crystallographic axis. It is shown that in dependence of the parameters, the presence of hypersonic waves can either enhance or reduce the bremsstrahlung cross-section.