FIELD-MEASUREMENTS OF SUPERCONDUCTING BENDING MAGNETS FOR COMPACT STORAGE-RING

We have constructed 180 degree superconducting bending magnets for: co mpact electron storage ring and tests of magnetic field qualities of t he magnet have been performed. Measured field qualities are; (1) high field homogeneity (normalized field errors are less than 1 X 10(-3) ov er the electron beam aperture), (2) high field stability (the decay of the field is less than 0.1%/year) at persistent current mode at 3.5T, (3) smalt gradient of coil axis (the averaged value is 0.5 mrad), (4) small difference of the fields between two magnets (the difference of the most region is less than +/-1X10(-3)). From the tests of field qu alities, we can confirm that the magnets have good performances for th e electron beam storage. Now, we can storage the electron beam of 600M eV.