Incoherent radiation of fast electrons in a bent crystal

Abstract

Incoherent bremsstrahlung of high energy particles in a crystal is caused by the thermal scattering of atoms with regard to their equilibrium positions in the lattice. A previously developed procedure for the simulation of incoherent emission is applied to the case of electron motion in a sinusoidally bent crystal. The results of the simulation agree with the data of recent experiments at the Mainz Microtron (MAMI). The pos sibility for utilizing sinusoidally bent crystals as undulators is discussed.

Incoherent radiation of fast electrons in a crystalline undulator

“…Details of the proce dure for the simulation of the incoherent radiation of electrons and positrons in a crystal, based on Eqs. (2) and (3), as well as comparison with available experi mental data are described in [4][5][6][7].…”

“…The incoherent radiation spectrum is similar to the Bethe-Heitler radiation spectrum in an amor phous medium and, at first glance, the intensity of the bremsstrahlung incoherent portion should not depend on crystal orientation. However, as demonstrated in [4][5][6][7], density redistribution of the particle flow in a crystal, related to the particle channeling effect [2,3,[8][9][10], can result in the emergence of a significant ori entation dependence of the incoherent radiation intensity. The procedure for the simulation of incoher ent radiation developed in [4][5][6][7] made it possible to interpret some of the experimental results obtained at the Kharkiv Institute of Physics and Technology [11] and at Mainz University [12].…”

“…In this work we apply the approach developed in [4][5][6][7] for calculating incoherent radiation in a sinuso idally curved crystal. In the last few years, the possibil ity of using such crystals as undulators has been actively discussed [13,14].…”