Magnetic Field Measurement System in Wide-Aperture Magnets of Physical Setups at the U-70 Accelerator Complex

The system of magnetic measurements in large volumes based on Hall probes has been developed in the Institute for High Energy Physics (IHEP). An example of its practical use to measure the topography of the spectrometric magnet’s field of the SPASCHARM experiment at the U-70 accelerator complex is described. In these measurements, the special attention has been paid to calibrations, monitoring the stability of parameters, and of the accuracy in positioning the probes in the magnet aperture and in their orientation. Further development of the system and the study of its capabilities for improving the accuracy, reducing the measurement time and, in general, increasing its flexibility in applications are also presented.