Technique and results of investigations of magnetic characteristics of type A experimental dipoles and type B first stage dipoles of the UNK

Dipoles of type A and B with cross sections of operating area equal to 60X70 and 43X91 mm and 5800 mm length represent one of the basic elements of ring electromagnet of the UNK first stage. Investigation of preproduction dipole series were conducted with the use of developed technique for magnetic measurements, precise equipment, on-line measuring system, enabling to measure under statistical and pulsed conditions of magnet excitation, applying induction field converters. It is shown that integral value of heterogeneity doesn't exceed the permissible value at all induction levels. Contribution of residual field at the level of injection field doesn't bring field heterogeneity beyond the permissible level. The value of the first harmonic of residual field equals 3.2X10-3 T in A magnet and 4.5X10-3 T in B magnet. The dependence of effective length on induction is presented. The results show that relative change of length equals 1.1X10-3, which is close to tolerance. Measurements of the integral value of rotation angle of the medium plane showed that its value lies within the range of 0.05-2.0 mrad for produced series of magnets