On some problems of the use of undulator radiation in metrology

The perspectives of the application of undulator radiation (UR) for metrological measurements, and, in particular, for monitoring of proton beams in colliders are considered. The basic measurement errors on UR, connected with the transverse gradient of the magnetic field in the undulator gap, were determined. The measurement technique, based on an undulator with the application of adjustment of the phase state (UAPS), allowing one to cancel errors caused by the gradients of the magnetic field, is worked out. Estimations of measurement errors caused by the inaccuracy of the geometrical phase installation are presented.