Improvements in Aladdin bend magnet stability by reduction of leakage currents

For 800 MeV operation of the Aladdin synchrotron storage ring, 730 amps of current flow through the 12 bend magnets in series. The bend magnet field coils are cooled by water which is in intimate contact with the copper coils. The elastomer hoses which deliver this water had up to 103 VDC between the coils and the electrically grounded plumbing. This configuration induced an electrolytic reaction which produced and deposited cuprous oxide on the inner walls of the hoses. The electrical resistance of the hoses was significantly reduced and leakage currents as high as 833 mA flowed to ground. This missing and changing bend magnet current resulted in significant horizontal electron orbit changes. When the deposits were large, additional deposits occurred quickly and tripped off the bend magnet power supply, resulting in lost photons for the storage ring users. We have electrically isolated the cooling water hose manifolds and lengthened some hoses. This minimized leakage currents to ground, slowed recontamination of new hoses and reversed contamination in badly contaminated hoses. These improvements have resulted in improved storage ring orbit stability (and thereby improved photon beam stability), less electrochemistry on the copper coils, and better operations reliability.