Persistent Current Effects in RHIC Arc Dipole Magnets Operated at Low Currents

Xiaorong Wang, Shlomo Caspi, Arup Ghosh, Stephen Gourlay, Ramesh Gupta, Animesh Jain, GianLuca Sabbi, Peter Wanderer, Schaa, Volker RW (Ed.), Power, Maria (Ed.), Shiltsev, Vladimir (Ed.), White, Marion (Ed.)
The Relativistic Heavy Ion Collider (RHIC) arc dipoles at Brookhaven National Laboratory are operated at low field for low energy Au-Au studies. Indications of strong nonlinear magnetic fields have been observed at these low currents due to the persistent current effects of superconducting NbTi filaments. We report the details of the measurement and calculation of the field errors due to persistent current effect. The persistent current induced field errors calculated with a model based on the
more » ... trand magnetization data agree well with the measurements of a spare arc dipole magnet. The dependence of the persistent current effects on the park current is calculated based on the validated model.
doi:10.18429/jacow-napac2016-mopob49 fatcat:qc6vkaa5wvgkvdkpuzv5g7pciy