Monochromator-free spectroscopy by changing the magnetic field in an undulator

In this work a method of spectroscopy without monochromators for the undulator radiation (UR) source is proposed. This method is based of changing the magnetic field in the undulator. Different variations of field modulations and corresponding object reactions for the case of a dipole regime of UR exitation were considered. The results of a numerical experiment are shown and possibilities of this method for an undulator consisting of two blocks and rearranging by changing the distance between the blocks were estimated.