SYNCHROTRON RADIATION OF RELATIVISTIC ELECTRONS MOVING AT SMALL PITCH-ANGLES IN INHOMOGENEOUS MAGNETIC FIELD

Synchrotron radiation of relativistic electrons moving in an inhomogeneous magnetic field at small pitch-angles is considered. The trajectory of an ultrarelativistic electron is obtained taking into account a curvature and radial inhomogeneity of magnetic field lines. The general formulae describing the radiation of an electron moving at pitchangles from 0 to pi/2 are derived. The range of instantaneous characteristic frequencies appears instead a single characteristic frequency. The applicability of the formulae for runaway electrons in the tokamak is evaluated. The condition for using of the obtained formulae is derived.