Measurements of quadrupole magnets for the MIT-Bates SHR

Results of measurements on 24 of the 128 new quadrupole magnets for the pulse storage/stretcher ring currently under construction at the MIT-Bates Accelerator Center are presented. At the outset it was decided to measure excitation curves for every quadrupole, and at the same time have enough sensitivity to extract the harmonic content. Measurements indicate that one can remeasure a quadrupole's strength and reproduce the value of (B/sub o/L/sub eff//a) versus current to better than 0.1%. Measurements also indicate that one can reserve the polarity of a quadrupole's remnant field by repeated cycling between 0 and 150 A, and obtain the same results (to the 0.1% level) as were obtained previously. >