Measurement of magnetic field characteristics of wigglers with the current strained wire method

The method for measurement of the magnetic field of a system where the magnetic field integral is close to zero by the current strained wire method is described. This method is successfully applied to high accuracy compensation of a field in magnets required first and second integrals to be zero along a trajectory of an electron beam, such as strong field wigglers and shifters. Exact compensation of the integrals permits us to avoid orbit distortion which could appear after installation of such magnetic system on the storage ring. Experimental data of the presented method are in good agreement with a computer-designed model.