Measurements of the quadrupoles for cooler-storagering injection beam line

The rotating coil measurement system and the measurement results of quadrupoles for CSRm injection beam line are introduced. The reasons causing the high order harmonic components are analyzed. The short circuit of magnet coils will cause sextupole component and the twists of magnet core will affect the octupole component. Otherwise, the chamfering also makes a great impact on the sextupole and octupole components, and some results are involved too.