Abstract:
One of the major tasks of the recent Duke storage ring
upgrade was the improvement of magnet power supply
performance. Prior to the upgrade, sixty-four small DC power
supplies acquired in the mid 1980's were used to
individually power all quadrupoles. Because of the marginal
performance of these power supplies, we were not able to
establish stable and reliable operation of the storage ring.
The ring upgrade allowed us to replace all of these power
supplies with modern ones. In the arc, all quadrupoles are
connected in series to form magnet families powered by four
larger power supplies. In the straight sections, we power
paired quadrupoles in series or individually with new power
supplies. For each of these new power supplies and for the
other existing major power supplies, we performed detailed
DC testing, AC noise measurements and transition response
measurements. Most power supplies required in-house
modifications to achieve our specifications. In this paper,
we describe and report the results of the magnet power
supply testing program for the Duke storage ring upgrade.